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.NET Framework Class Library

UserControl Class

Represents an .ascx file, also known as a user control, requested from a server that hosts an ASP.NET Web application. The file must be called from a Web Forms page or a parser error will occur.

Namespace:  System.Web.UI
Assembly:  System.Web (in System.Web.dll)
Public Class UserControl _
	Inherits TemplateControl _
	Implements IAttributeAccessor, INamingContainer, IUserControlDesignerAccessor

The UserControl type exposes the following members.

  Name Description
Public method UserControl Initializes a new instance of the UserControl class.
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  Name Description
Protected property Adapter Gets the browser-specific adapter for the control. (Inherited from Control.)
Public property Application Gets the Application object for the current Web request.
Public property AppRelativeTemplateSourceDirectory Gets or sets the application-relative virtual directory of the Page or UserControl object that contains this control. (Inherited from Control.)
Public property AppRelativeVirtualPath Gets or sets the application-relative, virtual directory path to the file from which the control is parsed and compiled. (Inherited from TemplateControl.)
Public property Attributes Gets a collection of all attribute name and value pairs declared in the user control tag within the .aspx file.
Protected property AutoHandlers Infrastructure. Obsolete. The AutoHandlers property has been deprecated in ASP.NET NET 2.0. It is used by generated classes and is not intended for use within your code. (Inherited from TemplateControl.)
Public property BindingContainer Infrastructure. Gets the control that contains this control's data binding. (Inherited from Control.)
Public property Cache Gets the Cache object that is associated with the application that contains the user control.
Public property CachePolicy Gets a reference to a collection of caching parameters for this user control.
Protected property ChildControlsCreated Gets a value that indicates whether the server control's child controls have been created. (Inherited from Control.)
Public property ClientID Gets the control ID for HTML markup that is generated by ASP.NET. (Inherited from Control.)
Public property ClientIDMode Gets or sets the algorithm that is used to generate the value of the ClientID property. (Inherited from Control.)
Protected property ClientIDSeparator Gets a character value representing the separator character used in the ClientID property. (Inherited from Control.)
Protected property Context Gets the HttpContext object associated with the server control for the current Web request. (Inherited from Control.)
Public property Controls Gets a ControlCollection object that represents the child controls for a specified server control in the UI hierarchy. (Inherited from Control.)
Public property DataItemContainer Gets a reference to the naming container if the naming container implements IDataItemContainer. (Inherited from Control.)
Public property DataKeysContainer Gets a reference to the naming container if the naming container implements IDataKeysControl. (Inherited from Control.)
Protected property DesignMode Gets a value indicating whether a control is being used on a design surface. (Inherited from Control.)
Public property EnableTheming Gets or sets a Boolean value indicating whether themes apply to the control that is derived from the TemplateControl class. (Inherited from TemplateControl.)
Public property EnableViewState Gets or sets a value indicating whether the server control persists its view state, and the view state of any child controls it contains, to the requesting client. (Inherited from Control.)
Protected property Events Gets a list of event handler delegates for the control. This property is read-only. (Inherited from Control.)
Protected property HasChildViewState Gets a value indicating whether the current server control's child controls have any saved view-state settings. (Inherited from Control.)
Public property ID Gets or sets the programmatic identifier assigned to the server control. (Inherited from Control.)
Protected property IdSeparator Infrastructure. Gets the character used to separate control identifiers. (Inherited from Control.)
Protected property IsChildControlStateCleared Gets a value indicating whether controls contained within this control have control state. (Inherited from Control.)
Public property IsPostBack Gets a value indicating whether the user control is being loaded in response to a client postback, or if it is being loaded and accessed for the first time.
Protected property IsTrackingViewState Gets a value that indicates whether the server control is saving changes to its view state. (Inherited from Control.)
Protected property IsViewStateEnabled Gets a value indicating whether view state is enabled for this control. (Inherited from Control.)
Protected property LoadViewStateByID Gets a value indicating whether the control participates in loading its view state by ID instead of index. (Inherited from Control.)
Public property NamingContainer Gets a reference to the server control's naming container, which creates a unique namespace for differentiating between server controls with the same Control.ID property value. (Inherited from Control.)
Public property Page Gets a reference to the Page instance that contains the server control. (Inherited from Control.)
Public property Parent Gets a reference to the server control's parent control in the page control hierarchy. (Inherited from Control.)
Public property RenderingCompatibility Gets a value that specifies the ASP.NET version that rendered HTML will be compatible with. (Inherited from Control.)
Public property Request Gets the HttpRequest object for the current Web request.
Public property Response Gets the HttpResponse object for the current Web request.
Public property Server Gets the HttpServerUtility object for the current Web request.
Public property Session Gets the HttpSessionState object for the current Web request.
Public property Site Gets information about the container that hosts the current control when rendered on a design surface. (Inherited from Control.)
Public property SkinID Gets or sets the skin to apply to the control. (Inherited from Control.)
Protected property SupportAutoEvents Infrastructure. Gets a value indicating whether the TemplateControl control supports automatic events. (Inherited from TemplateControl.)
Public property TemplateControl Gets or sets a reference to the template that contains this control. (Inherited from Control.)
Public property TemplateSourceDirectory Gets the virtual directory of the Page or UserControl that contains the current server control. (Inherited from Control.)
Public property Trace Gets the TraceContext object for the current Web request.
Public property UniqueID Gets the unique, hierarchically qualified identifier for the server control. (Inherited from Control.)
Public property ValidateRequestMode Gets or sets a value that indicates whether the control checks client input from the browser for potentially dangerous values. (Inherited from Control.)
Protected property ViewState Gets a dictionary of state information that allows you to save and restore the view state of a server control across multiple requests for the same page. (Inherited from Control.)
Protected property ViewStateIgnoresCase Gets a value that indicates whether the StateBag object is case-insensitive. (Inherited from Control.)
Public property ViewStateMode Gets or sets the view-state mode of this control. (Inherited from Control.)
Public property Visible Gets or sets a value that indicates whether a server control is rendered as UI on the page. (Inherited from Control.)
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  Name Description
Protected method AddedControl Called after a child control is added to the Controls collection of the Control object. (Inherited from Control.)
Protected method AddParsedSubObject Notifies the server control that an element, either XML or HTML, was parsed, and adds the element to the server control's ControlCollection object. (Inherited from Control.)
Public method ApplyStyleSheetSkin Applies the style properties defined in the page style sheet to the control. (Inherited from Control.)
Protected method BeginRenderTracing Begins design-time tracing of rendering data. (Inherited from Control.)
Protected method BuildProfileTree Infrastructure. Gathers information about the server control and delivers it to the Trace property to be displayed when tracing is enabled for the page. (Inherited from Control.)
Protected method ClearCachedClientID Infrastructure. Sets the cached ClientID value to null. (Inherited from Control.)
Protected method ClearChildControlState Deletes the control-state information for the server control's child controls. (Inherited from Control.)
Protected method ClearChildState Deletes the view-state and control-state information for all the server control's child controls. (Inherited from Control.)
Protected method ClearChildViewState Deletes the view-state information for all the server control's child controls. (Inherited from Control.)
Protected method ClearEffectiveClientIDMode Infrastructure. Sets the ClientIDMode property of the current control instance and of any child controls to Inherit. (Inherited from Control.)
Protected method Construct Performs design-time logic. (Inherited from TemplateControl.)
Protected method CreateChildControls Called by the ASP.NET page framework to notify server controls that use composition-based implementation to create any child controls they contain in preparation for posting back or rendering. (Inherited from Control.)
Protected method CreateControlCollection Creates a new ControlCollection object to hold the child controls (both literal and server) of the server control. (Inherited from Control.)
Protected method CreateResourceBasedLiteralControl Infrastructure. Accesses literal strings stored in a resource. The CreateResourceBasedLiteralControl method is not intended for use from within your code. (Inherited from TemplateControl.)
Public method DataBind() Binds a data source to the invoked server control and all its child controls. (Inherited from Control.)
Protected method DataBind(Boolean) Binds a data source to the invoked server control and all its child controls with an option to raise the DataBinding event. (Inherited from Control.)
Protected method DataBindChildren Binds a data source to the server control's child controls. (Inherited from Control.)
Public method DesignerInitialize Performs any initialization steps on the user control that are required by RAD designers.
Public method Dispose Enables a server control to perform final clean up before it is released from memory. (Inherited from Control.)
Protected method EndRenderTracing Ends design-time tracing of rendering data. (Inherited from Control.)
Protected method EnsureChildControls Determines whether the server control contains child controls. If it does not, it creates child controls. (Inherited from Control.)
Protected method EnsureID Creates an identifier for controls that do not have an identifier assigned. (Inherited from Control.)
Public method Equals(Object) Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected method Eval(String) Evaluates a data-binding expression. (Inherited from TemplateControl.)
Protected method Eval(String, String) Evaluates a data-binding expression using the specified format string to display the result. (Inherited from TemplateControl.)
Protected method Finalize Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public method FindControl(String) Searches the current naming container for a server control with the specified id parameter. (Inherited from Control.)
Protected method FindControl(String, Int32) Infrastructure. Searches the current naming container for a server control with the specified id and an integer, specified in the pathOffset parameter, which aids in the search. You should not override this version of the FindControl method. (Inherited from Control.)
Public method Focus Sets input focus to a control. (Inherited from Control.)
Protected method FrameworkInitialize Infrastructure. Initializes the control that is derived from the TemplateControl class. (Inherited from TemplateControl.)
Protected method GetDesignModeState Infrastructure. Gets design-time data for a control. (Inherited from Control.)
Protected method GetGlobalResourceObject(String, String) Gets an application-level resource object based on the specified ClassKey and ResourceKey properties. (Inherited from TemplateControl.)
Protected method GetGlobalResourceObject(String, String, Type, String) Gets an application-level resource object based on the specified ClassKey and ResourceKey properties, object type, and property name of the resource. (Inherited from TemplateControl.)
Public method GetHashCode Serves as the default hash function. (Inherited from Object.)
Protected method GetLocalResourceObject(String) Gets a page-level resource object based on the specified ResourceKey property. (Inherited from TemplateControl.)
Protected method GetLocalResourceObject(String, Type, String) Gets a page-level resource object based on the specified ResourceKey property, object type, and property name. (Inherited from TemplateControl.)
Public method GetRouteUrl(Object) Gets the URL that corresponds to a set of route parameters. (Inherited from Control.)
Public method GetRouteUrl(RouteValueDictionary) Gets the URL that corresponds to a set of route parameters. (Inherited from Control.)
Public method GetRouteUrl(String, Object) Gets the URL that corresponds to a set of route parameters and a route name. (Inherited from Control.)
Public method GetRouteUrl(String, RouteValueDictionary) Gets the URL that corresponds to a set of route parameters and a route name. (Inherited from Control.)
Public method GetType Gets the Type of the current instance. (Inherited from Object.)
Public method GetUniqueIDRelativeTo Returns the prefixed portion of the UniqueID property of the specified control. (Inherited from Control.)
Public method HasControls Determines if the server control contains any child controls. (Inherited from Control.)
Protected method HasEvents Returns a value indicating whether events are registered for the control or any child controls. (Inherited from Control.)
Public method InitializeAsUserControl Initializes the UserControl object that has been created declaratively. Since there are some differences between pages and user controls, this method makes sure that the user control is initialized properly.
Protected method IsLiteralContent Infrastructure. Determines if the server control holds only literal content. (Inherited from Control.)
Public method LoadControl(String) Loads a Control object from a file based on a specified virtual path. (Inherited from TemplateControl.)
Public method LoadControl(Type, Object[]) Loads a Control object based on a specified type and constructor parameters. (Inherited from TemplateControl.)
Protected method LoadControlState Restores control-state information from a previous page request that was saved by the SaveControlState method. (Inherited from Control.)
Public method LoadTemplate Obtains an instance of the ITemplate interface from an external file. (Inherited from TemplateControl.)
Protected method LoadViewState Restores the view-state information from a previous user control request that was saved by the SaveViewState method. (Overrides Control.LoadViewState(Object).)
Public method MapPath Assigns a virtual file path, either absolute or relative, to a physical file path.
Protected method MapPathSecure Retrieves the physical path that a virtual path, either absolute or relative, maps to. (Inherited from Control.)
Protected method MemberwiseClone Creates a shallow copy of the current Object. (Inherited from Object.)
Protected method OnAbortTransaction Raises the AbortTransaction event. (Inherited from TemplateControl.)
Protected method OnBubbleEvent Determines whether the event for the server control is passed up the page's UI server control hierarchy. (Inherited from Control.)
Protected method OnCommitTransaction Raises the CommitTransaction event. (Inherited from TemplateControl.)
Protected method OnDataBinding Raises the DataBinding event. (Inherited from Control.)
Protected method OnError Raises the Error event. (Inherited from TemplateControl.)
Protected method OnInit Raises the Init event. (Overrides Control.OnInit(EventArgs).)
Protected method OnLoad Raises the Load event. (Inherited from Control.)
Protected method OnPreRender Raises the PreRender event. (Inherited from Control.)
Protected method OnUnload Raises the Unload event. (Inherited from Control.)
Protected method OpenFile Gets a Stream used to read a file. (Inherited from Control.)
Public method ParseControl(String) Parses an input string into a Control object on the Web Forms page or user control. (Inherited from TemplateControl.)
Public method ParseControl(String, Boolean) Parses an input string into a Control object on the ASP.NET Web page or user control. (Inherited from TemplateControl.)
Protected method RaiseBubbleEvent Assigns any sources of the event and its information to the control's parent. (Inherited from Control.)
Public method ReadStringResource() Infrastructure. Reads a string resource. The ReadStringResource method is not intended for use from within your code. (Inherited from TemplateControl.)
Protected method RemovedControl Called after a child control is removed from the Controls collection of the Control object. (Inherited from Control.)
Protected method Render Sends server control content to a provided HtmlTextWriter object, which writes the content to be rendered on the client. (Inherited from Control.)
Protected method RenderChildren Outputs the content of a server control's children to a provided HtmlTextWriter object, which writes the content to be rendered on the client. (Inherited from Control.)
Public method RenderControl(HtmlTextWriter) Outputs server control content to a provided HtmlTextWriter object and stores tracing information about the control if tracing is enabled. (Inherited from Control.)
Protected method RenderControl(HtmlTextWriter, ControlAdapter) Outputs server control content to a provided HtmlTextWriter object using a provided ControlAdapter object. (Inherited from Control.)
Protected method ResolveAdapter Gets the control adapter responsible for rendering the specified control. (Inherited from Control.)
Public method ResolveClientUrl Gets a URL that can be used by the browser. (Inherited from Control.)
Public method ResolveUrl Converts a URL into one that is usable on the requesting client. (Inherited from Control.)
Protected method SaveControlState Saves any server control state changes that have occurred since the time the page was posted back to the server. (Inherited from Control.)
Protected method SaveViewState Saves any user control view-state changes that have occurred since the last page postback. (Overrides Control.SaveViewState().)
Protected method SetDesignModeState Sets design-time data for a control. (Inherited from Control.)
Public method SetRenderMethodDelegate Infrastructure. Assigns an event handler delegate to render the server control and its content into its parent control. (Inherited from Control.)
Protected method SetStringResourcePointer Infrastructure. Sets a pointer to a string resource. The SetStringResourcePointer method is used by generated classes and is not intended for use from within your code. (Inherited from TemplateControl.)
Public method SetTraceData(Object, Object) Sets trace data for design-time tracing of rendering data, using the trace data key and the trace data value. (Inherited from Control.)
Public method SetTraceData(Object, Object, Object) Sets trace data for design-time tracing of rendering data, using the traced object, the trace data key, and the trace data value. (Inherited from Control.)
Public method TestDeviceFilter Returns a Boolean value indicating whether a device filter applies to the HTTP request. (Inherited from TemplateControl.)
Public method ToString Returns a string that represents the current object. (Inherited from Object.)
Protected method TrackViewState Causes tracking of view-state changes to the server control so they can be stored in the server control's StateBag object. This object is accessible through the Control.ViewState property. (Inherited from Control.)
Public method TryUpdateModel<TModel>(TModel) Attempts to update the model instance by using the values from the data-bound control.
Public method TryUpdateModel<TModel>(TModel, IValueProvider) Attempts to update the model instance using values from the value provider.
Public method UpdateModel<TModel>(TModel) Updates the model instance by using values from the data-bound control.
Public method UpdateModel<TModel>(TModel, IValueProvider) Updates the specified model instance using values from the value provider of the user control.
Protected method WriteUTF8ResourceString Infrastructure. Writes a resource string to an HtmlTextWriter control. The WriteUTF8ResourceString method is used by generated classes and is not intended for use from within your code. (Inherited from TemplateControl.)
Protected method XPath(String) Evaluates an XPath data-binding expression. (Inherited from TemplateControl.)
Protected method XPath(String, String) Evaluates an XPath data-binding expression using the specified format string to display the result. (Inherited from TemplateControl.)
Protected method XPath(String, IXmlNamespaceResolver) Evaluates an XPath data-binding expression using the specified prefix and namespace mappings for namespace resolution. (Inherited from TemplateControl.)
Protected method XPath(String, String, IXmlNamespaceResolver) Evaluates an XPath data-binding expression using the specified prefix and namespace mappings for namespace resolution and the specified format string to display the result. (Inherited from TemplateControl.)
Protected method XPathSelect(String) Evaluates an XPath data-binding expression and returns a node collection that implements the IEnumerable interface. (Inherited from TemplateControl.)
Protected method XPathSelect(String, IXmlNamespaceResolver) Evaluates an XPath data-binding expression using the specified prefix and namespace mappings for namespace resolution and returns a node collection that implements the IEnumerable interface. (Inherited from TemplateControl.)
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  Name Description
Public event AbortTransaction Occurs when a user ends a transaction. (Inherited from TemplateControl.)
Public event CommitTransaction Occurs when a transaction completes. (Inherited from TemplateControl.)
Public event DataBinding Occurs when the server control binds to a data source. (Inherited from Control.)
Public event Disposed Occurs when a server control is released from memory, which is the last stage of the server control lifecycle when an ASP.NET page is requested. (Inherited from Control.)
Public event Error Occurs when an unhandled exception is thrown. (Inherited from TemplateControl.)
Public event Init Occurs when the server control is initialized, which is the first step in its lifecycle. (Inherited from Control.)
Public event Load Occurs when the server control is loaded into the Page object. (Inherited from Control.)
Public event PreRender Occurs after the Control object is loaded but prior to rendering. (Inherited from Control.)
Public event Unload Occurs when the server control is unloaded from memory. (Inherited from Control.)
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  Name Description
Public Extension Method EnableDynamicData(Type) Overloaded. Enables Dynamic Data behavior for the specified data control. (Defined by DataControlExtensions.)
Public Extension Method EnableDynamicData(Type, Object) Overloaded. Enables Dynamic Data behavior for the specified data control. (Defined by DataControlExtensions.)
Public Extension Method EnableDynamicData(Type, IDictionary<String, Object>) Overloaded. Enables Dynamic Data behavior for the specified data control. (Defined by DataControlExtensions.)
Public Extension Method FindDataSourceControl Returns the data source that is associated with the data control for the specified control. (Defined by DynamicDataExtensions.)
Public Extension Method FindFieldTemplate Returns the field template for the specified column in the specified control's naming container. (Defined by DynamicDataExtensions.)
Public Extension Method FindMetaTable Returns the metatable object for the containing data control. (Defined by DynamicDataExtensions.)
Public Extension Method GetDefaultValues Gets the collection of the default values for the specified data control. (Defined by DynamicDataExtensions.)
Public Extension Method GetMetaTable Gets the table metadata for the specified data control. (Defined by DynamicDataExtensions.)
Public Extension Method SetMetaTable(MetaTable) Overloaded. Sets the table metadata for the specified data control. (Defined by DynamicDataExtensions.)
Public Extension Method SetMetaTable(MetaTable, IDictionary<String, Object>) Overloaded. Sets the table metadata and default value mapping for the specified data control. (Defined by DynamicDataExtensions.)
Public Extension Method SetMetaTable(MetaTable, Object) Overloaded. Sets the table metadata and default value mapping for the specified data control. (Defined by DynamicDataExtensions.)
Public Extension Method TryGetMetaTable Determines whether table metadata is available. (Defined by DynamicDataExtensions.)
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  Name Description
Explicit interface implemetation Private method IAttributeAccessor.GetAttribute Infrastructure. Returns the value of the specified user control attribute.
Explicit interface implemetation Private method IAttributeAccessor.SetAttribute Infrastructure. Sets the value of the specified user control attribute.
Explicit interface implemetation Private property IControlBuilderAccessor.ControlBuilder For a description of this member, see IControlBuilderAccessor.ControlBuilder. (Inherited from Control.)
Explicit interface implemetation Private method IControlDesignerAccessor.GetDesignModeState For a description of this member, see IControlDesignerAccessor.GetDesignModeState. (Inherited from Control.)
Explicit interface implemetation Private method IControlDesignerAccessor.SetDesignModeState For a description of this member, see IControlDesignerAccessor.SetDesignModeState. (Inherited from Control.)
Explicit interface implemetation Private method IControlDesignerAccessor.SetOwnerControl Infrastructure. For a description of this member, see IControlDesignerAccessor.SetOwnerControl. (Inherited from Control.)
Explicit interface implemetation Private property IControlDesignerAccessor.UserData For a description of this member, see IControlDesignerAccessor.UserData. (Inherited from Control.)
Explicit interface implemetation Private property IDataBindingsAccessor.DataBindings For a description of this member, see IDataBindingsAccessor.DataBindings. (Inherited from Control.)
Explicit interface implemetation Private property IDataBindingsAccessor.HasDataBindings For a description of this member, see IDataBindingsAccessor.HasDataBindings. (Inherited from Control.)
Explicit interface implemetation Private property IExpressionsAccessor.Expressions For a description of this member, see IExpressionsAccessor.Expressions. (Inherited from Control.)
Explicit interface implemetation Private property IExpressionsAccessor.HasExpressions For a description of this member, see IExpressionsAccessor.HasExpressions. (Inherited from Control.)
Explicit interface implemetation Private method IFilterResolutionService.CompareFilters Infrastructure. Returns a value that indicates whether a parent/child relationship exists between two specified device filters. (Inherited from TemplateControl.)
Explicit interface implemetation Private method IFilterResolutionService.EvaluateFilter Infrastructure. Returns a value that indicates whether the specified filter is a type of the current filter object. (Inherited from TemplateControl.)
Explicit interface implemetation Private method IParserAccessor.AddParsedSubObject For a description of this member, see IParserAccessor.AddParsedSubObject. (Inherited from Control.)
Explicit interface implemetation Private property IUserControlDesignerAccessor.InnerText Infrastructure. Gets or sets the text that appears between the opening and closing tags of a user control.
Explicit interface implemetation Private property IUserControlDesignerAccessor.TagName Gets or sets the full tag name of the user control.
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The UserControl class is associated with files that have .ascx extensions. These files are compiled at run time as UserControl objects and cached in server memory.

You can nest user controls by declaring one .ascx file in another including the latter in a Web Forms page.

User controls are contained in ASP.NET Web Forms pages, and offer Web developers an easy way to capture commonly used Web UI. They are instantiated and cached in ways similar to Page objects. Unlike pages, however, user controls cannot be called independently. They can only be called from the page or other user control that contains them.

Derive from this class if you want to create a user control using the code-behind technique. This is recommended if you are developing Web Forms pages using this technique.

For information about creating user controls declaratively, see ASP.NET User Controls.

Topic Location
How to: Cache Multiple Versions of a User Control Based on Parameters Building ASP .NET Web Applications
How to: Convert Web Forms Pages into ASP.NET User Controls Building ASP .NET Web Applications
How to: Treat a User Control as a Web Parts Control Building ASP .NET Web Applications
How to: Cache Multiple Versions of a User Control Based on Parameters Building ASP .NET Web Applications
How to: Convert Web Forms Pages into ASP.NET User Controls Building ASP .NET Web Applications
How to: Treat a User Control as a Web Parts Control Building ASP .NET Web Applications
How to: Create ASP.NET User Controls (Visual Studio) Building ASP .NET Web Applications in Visual Studio
How to: Include ASP.NET User Controls in Web Pages (Visual Studio) Building ASP .NET Web Applications in Visual Studio

The class defined in the following example, SimpleControl, inherits the UserControl class and can be used as an ASP.NET code-behind class. It uses the TextBox, Label, and Button Web server controls and defines a myButton_Click method that assigns the TextBox.Text property value, along with two strings, to the Label.Text property.

Security note Security Note

This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview.

Imports System
Imports System.Web.UI
Imports System.Web.UI.WebControls


Public Class SimpleControl
   Inherits UserControl
   Public name As TextBox
   Public output As Label
   Public myButton As Button


   Public Sub myButton_Click(sender As Object, e As EventArgs)

      output.Text = "Hello, " + name.Text + "." 

   End Sub   

End Class

The following example is markup contained in an .ascx file. You can use the SimpleControl class defined in the previous example as a code-behind class for the markup in this .ascx file.

<%@ control inherits = "SimpleControl" src = "SimpleControl.vb" %>

<table style="background-color: yellow; font: 10pt verdana;border-width:1;border-style:solid;border-color:black;" cellspacing="15">
<tr>
<td><b>Enter your name here: </b></td>
<td><ASP:TextBox id="name" runat="server"/></td>
</tr>
<tr>
<td><b><ASP:Label id="output" runat="server"/></b></td>
</tr>
<tr>
<td></td>
<td><asp:button text="Submit" OnClick="myButton_Click" runat="server" /></td>
</tr>
</table>

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.