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TextBox Class

Displays a text box control for user input.

Namespace:  System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)

[ControlValuePropertyAttribute(L"Text")]
[ValidationPropertyAttribute(L"Text")]
public ref class TextBox : public WebControl, 
	IPostBackDataHandler, IEditableTextControl, ITextControl
<asp:TextBox />

The TextBox type exposes the following members.

  NameDescription
Public methodTextBoxInitializes a new instance of the TextBox class.
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  NameDescription
Public propertyAccessKeyGets or sets the access key that allows you to quickly navigate to the Web server control. (Inherited from WebControl.)
Protected propertyAdapterGets the browser-specific adapter for the control. (Inherited from Control.)
Public propertyAppRelativeTemplateSourceDirectoryGets or sets the application-relative virtual directory of the Page or UserControl object that contains this control. (Inherited from Control.)
Public propertyAttributesGets the collection of arbitrary attributes (for rendering only) that do not correspond to properties on the control. (Inherited from WebControl.)
Public propertyAutoCompleteTypeGets or sets a value that indicates the AutoComplete behavior of the TextBox control
Public propertyAutoPostBackGets or sets a value that indicates whether an automatic postback to the server occurs when the TextBox control loses focus.
Public propertyBackColorGets or sets the background color of the Web server control. (Inherited from WebControl.)
Public propertyBindingContainerInfrastructure. Gets the control that contains this control's data binding. (Inherited from Control.)
Public propertyBorderColorGets or sets the border color of the Web control. (Inherited from WebControl.)
Public propertyBorderStyleGets or sets the border style of the Web server control. (Inherited from WebControl.)
Public propertyBorderWidthGets or sets the border width of the Web server control. (Inherited from WebControl.)
Public propertyCausesValidationGets or sets a value indicating whether validation is performed when the TextBox control is set to validate when a postback occurs.
Protected propertyChildControlsCreatedGets a value that indicates whether the server control's child controls have been created. (Inherited from Control.)
Public propertyClientIDGets the control ID for HTML markup that is generated by ASP.NET. (Inherited from Control.)
Public propertyClientIDModeGets or sets the algorithm that is used to generate the value of the ClientID property. (Inherited from Control.)
Protected propertyClientIDSeparatorGets a character value representing the separator character used in the ClientID property. (Inherited from Control.)
Public propertyColumnsGets or sets the display width of the text box in characters.
Protected propertyContextGets the HttpContext object associated with the server control for the current Web request. (Inherited from Control.)
Public propertyControlsGets a ControlCollection object that represents the child controls for a specified server control in the UI hierarchy. (Inherited from Control.)
Public propertyControlStyleGets the style of the Web server control. This property is used primarily by control developers. (Inherited from WebControl.)
Public propertyControlStyleCreatedGets a value indicating whether a Style object has been created for the ControlStyle property. This property is primarily used by control developers. (Inherited from WebControl.)
Public propertyCssClassGets or sets the Cascading Style Sheet (CSS) class rendered by the Web server control on the client. (Inherited from WebControl.)
Public propertyDataItemContainerGets a reference to the naming container if the naming container implements IDataItemContainer. (Inherited from Control.)
Public propertyDataKeysContainerGets a reference to the naming container if the naming container implements IDataKeysControl. (Inherited from Control.)
Protected propertyDesignModeGets a value indicating whether a control is being used on a design surface. (Inherited from Control.)
Public propertyEnabledGets or sets a value indicating whether the Web server control is enabled. (Inherited from WebControl.)
Public propertyEnableThemingGets or sets a value indicating whether themes apply to this control. (Inherited from WebControl.)
Public propertyEnableViewStateGets 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 propertyEventsGets a list of event handler delegates for the control. This property is read-only. (Inherited from Control.)
Public propertyFontGets the font properties associated with the Web server control. (Inherited from WebControl.)
Public propertyForeColorGets or sets the foreground color (typically the color of the text) of the Web server control. (Inherited from WebControl.)
Public propertyHasAttributesGets a value indicating whether the control has attributes set. (Inherited from WebControl.)
Protected propertyHasChildViewStateGets a value indicating whether the current server control's child controls have any saved view-state settings. (Inherited from Control.)
Public propertyHeightGets or sets the height of the Web server control. (Inherited from WebControl.)
Public propertyIDGets or sets the programmatic identifier assigned to the server control. (Inherited from Control.)
Protected propertyIdSeparatorInfrastructure. Gets the character used to separate control identifiers. (Inherited from Control.)
Protected propertyIsChildControlStateClearedGets a value indicating whether controls contained within this control have control state. (Inherited from Control.)
Protected propertyIsEnabledGets a value indicating whether the control is enabled. (Inherited from WebControl.)
Protected propertyIsTrackingViewStateGets a value that indicates whether the server control is saving changes to its view state. (Inherited from Control.)
Protected propertyIsViewStateEnabledGets a value indicating whether view state is enabled for this control. (Inherited from Control.)
Protected propertyLoadViewStateByIDGets a value indicating whether the control participates in loading its view state by ID instead of index. (Inherited from Control.)
Public propertyMaxLengthGets or sets the maximum number of characters allowed in the text box.
Public propertyNamingContainerGets 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 propertyPageGets a reference to the Page instance that contains the server control. (Inherited from Control.)
Public propertyParentGets a reference to the server control's parent control in the page control hierarchy. (Inherited from Control.)
Public propertyReadOnlyGets or sets a value indicating whether the contents of the TextBox control can be changed.
Public propertyRenderingCompatibilityGets a value that specifies the ASP.NET version that rendered HTML will be compatible with. (Inherited from Control.)
Public propertyRowsGets or sets the number of rows displayed in a multiline text box.
Public propertySiteGets information about the container that hosts the current control when rendered on a design surface. (Inherited from Control.)
Public propertySkinIDGets or sets the skin to apply to the control. (Inherited from WebControl.)
Public propertyStyleGets a collection of text attributes that will be rendered as a style attribute on the outer tag of the Web server control. (Inherited from WebControl.)
Public propertySupportsDisabledAttributeGets a value that indicates whether the control should set the disabled attribute of the rendered HTML element to "disabled" when the control's IsEnabled property is false. (Inherited from WebControl.)
Public propertyTabIndexGets or sets the tab index of the Web server control. (Inherited from WebControl.)
Protected propertyTagKeyGets the HTML tag for the text box control. This property is protected. (Overrides WebControl::TagKey.)
Protected propertyTagNameGets the name of the control tag. This property is used primarily by control developers. (Inherited from WebControl.)
Public propertyTemplateControlGets or sets a reference to the template that contains this control. (Inherited from Control.)
Public propertyTemplateSourceDirectoryGets the virtual directory of the Page or UserControl that contains the current server control. (Inherited from Control.)
Public propertyTextGets or sets the text content of the TextBox control.
Public propertyTextModeGets or sets the behavior mode (such as, single-line, multiline, or password) of the TextBox control.
Public propertyToolTipGets or sets the text displayed when the mouse pointer hovers over the Web server control. (Inherited from WebControl.)
Public propertyUniqueIDGets the unique, hierarchically qualified identifier for the server control. (Inherited from Control.)
Public propertyValidateRequestModeGets or sets a value that indicates whether the control checks client input from the browser for potentially dangerous values. (Inherited from Control.)
Public propertyValidationGroupGets or sets the group of controls for which the TextBox control causes validation when it posts back to the server.
Protected propertyViewStateGets 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 propertyViewStateIgnoresCaseGets a value that indicates whether the StateBag object is case-insensitive. (Inherited from Control.)
Public propertyViewStateModeGets or sets the view-state mode of this control. (Inherited from Control.)
Public propertyVisibleGets or sets a value that indicates whether a server control is rendered as UI on the page. (Inherited from Control.)
Public propertyWidthGets or sets the width of the Web server control. (Inherited from WebControl.)
Public propertyWrapGets or sets a value indicating whether the text content wraps within a multiline text box.
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  NameDescription
Protected methodAddAttributesToRenderInfrastructure. Adds HTML attributes and styles that need to be rendered to the specified HtmlTextWriter instance. (Overrides WebControl::AddAttributesToRender(HtmlTextWriter).)
Protected methodAddedControlCalled after a child control is added to the Controls collection of the Control object. (Inherited from Control.)
Protected methodAddParsedSubObjectInfrastructure. Overridden to allow only literal controls to be added as the Text property. (Overrides Control::AddParsedSubObject(Object).)
Public methodApplyStyleCopies any nonblank elements of the specified style to the Web control, overwriting any existing style elements of the control. This method is primarily used by control developers. (Inherited from WebControl.)
Public methodApplyStyleSheetSkinApplies the style properties defined in the page style sheet to the control. (Inherited from Control.)
Protected methodBeginRenderTracingBegins design-time tracing of rendering data. (Inherited from Control.)
Protected methodBuildProfileTreeInfrastructure. 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 methodClearCachedClientIDInfrastructure. Sets the cached ClientID value to nullptr. (Inherited from Control.)
Protected methodClearChildControlStateDeletes the control-state information for the server control's child controls. (Inherited from Control.)
Protected methodClearChildStateDeletes the view-state and control-state information for all the server control's child controls. (Inherited from Control.)
Protected methodClearChildViewStateDeletes the view-state information for all the server control's child controls. (Inherited from Control.)
Protected methodClearEffectiveClientIDModeInfrastructure. Sets the ClientIDMode property of the current control instance and of any child controls to Inherit. (Inherited from Control.)
Public methodCopyBaseAttributesCopies the properties not encapsulated by the Style object from the specified Web server control to the Web server control that this method is called from. This method is used primarily by control developers. (Inherited from WebControl.)
Protected methodCreateChildControlsCalled 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 methodCreateControlCollectionCreates a new ControlCollection object to hold the child controls (both literal and server) of the server control. (Inherited from Control.)
Protected methodCreateControlStyleCreates the style object that is used internally by the WebControl class to implement all style related properties. This method is used primarily by control developers. (Inherited from WebControl.)
Public methodDataBind()Binds a data source to the invoked server control and all its child controls. (Inherited from Control.)
Protected methodDataBind(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 methodDataBindChildrenBinds a data source to the server control's child controls. (Inherited from Control.)
Public methodDisposeEnables a server control to perform final clean up before it is released from memory. (Inherited from Control.)
Protected methodEndRenderTracingEnds design-time tracing of rendering data. (Inherited from Control.)
Protected methodEnsureChildControlsDetermines whether the server control contains child controls. If it does not, it creates child controls. (Inherited from Control.)
Protected methodEnsureIDCreates an identifier for controls that do not have an identifier assigned. (Inherited from Control.)
Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodFindControl(String)Searches the current naming container for a server control with the specified id parameter. (Inherited from Control.)
Protected methodFindControl(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 methodFocusSets input focus to a control. (Inherited from Control.)
Protected methodGetDesignModeStateInfrastructure. Gets design-time data for a control. (Inherited from Control.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetRouteUrl(Object)Gets the URL that corresponds to a set of route parameters. (Inherited from Control.)
Public methodGetRouteUrl(RouteValueDictionary)Gets the URL that corresponds to a set of route parameters. (Inherited from Control.)
Public methodGetRouteUrl(String, Object)Gets the URL that corresponds to a set of route parameters and a route name. (Inherited from Control.)
Public methodGetRouteUrl(String, RouteValueDictionary)Gets the URL that corresponds to a set of route parameters and a route name. (Inherited from Control.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodGetUniqueIDRelativeToReturns the prefixed portion of the UniqueID property of the specified control. (Inherited from Control.)
Public methodHasControlsDetermines if the server control contains any child controls. (Inherited from Control.)
Protected methodHasEventsReturns a value indicating whether events are registered for the control or any child controls. (Inherited from Control.)
Protected methodIsLiteralContentInfrastructure. Determines if the server control holds only literal content. (Inherited from Control.)
Protected methodLoadControlStateRestores control-state information from a previous page request that was saved by the SaveControlState method. (Inherited from Control.)
Protected methodLoadPostDataProcesses the postback data for the TextBox control.
Protected methodLoadViewStateRestores view-state information from a previous request that was saved with the SaveViewState method. (Inherited from WebControl.)
Protected methodMapPathSecureRetrieves the physical path that a virtual path, either absolute or relative, maps to. (Inherited from Control.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodMergeStyleCopies any nonblank elements of the specified style to the Web control, but will not overwrite any existing style elements of the control. This method is used primarily by control developers. (Inherited from WebControl.)
Protected methodOnBubbleEventDetermines whether the event for the server control is passed up the page's UI server control hierarchy. (Inherited from Control.)
Protected methodOnDataBindingRaises the DataBinding event. (Inherited from Control.)
Protected methodOnInitRaises the Init event. (Inherited from Control.)
Protected methodOnLoadRaises the Load event. (Inherited from Control.)
Protected methodOnPreRenderInfrastructure. Registers client script for generating postback events prior to rendering on the client, if AutoPostBack is true. (Overrides Control::OnPreRender(EventArgs).)
Protected methodOnTextChangedRaises the TextChanged event. This allows you to handle the event directly.
Protected methodOnUnloadRaises the Unload event. (Inherited from Control.)
Protected methodOpenFileGets a Stream used to read a file. (Inherited from Control.)
Protected methodRaiseBubbleEventAssigns any sources of the event and its information to the control's parent. (Inherited from Control.)
Protected methodRaisePostDataChangedEventInvokes the OnTextChanged method when the posted data for the TextBox control has changed.
Protected methodRemovedControlCalled after a child control is removed from the Controls collection of the Control object. (Inherited from Control.)
Protected methodRenderRenders the TextBox control to the specified HtmlTextWriter object. (Overrides WebControl::Render(HtmlTextWriter).)
Public methodRenderBeginTagRenders the HTML opening tag of the control to the specified writer. This method is used primarily by control developers. (Inherited from WebControl.)
Protected methodRenderChildrenOutputs 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.)
Protected methodRenderContentsRenders the contents of the control to the specified writer. This method is used primarily by control developers. (Inherited from WebControl.)
Public methodRenderControl(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 methodRenderControl(HtmlTextWriter, ControlAdapter)Outputs server control content to a provided HtmlTextWriter object using a provided ControlAdapter object. (Inherited from Control.)
Public methodRenderEndTagRenders the HTML closing tag of the control into the specified writer. This method is used primarily by control developers. (Inherited from WebControl.)
Protected methodResolveAdapterGets the control adapter responsible for rendering the specified control. (Inherited from Control.)
Public methodResolveClientUrlGets a URL that can be used by the browser. (Inherited from Control.)
Public methodResolveUrlConverts a URL into one that is usable on the requesting client. (Inherited from Control.)
Protected methodSaveControlStateSaves any server control state changes that have occurred since the time the page was posted back to the server. (Inherited from Control.)
Protected methodSaveViewStateSaves the changes to the text box view state since the time the page was posted back to the server. (Overrides WebControl::SaveViewState().)
Protected methodSetDesignModeStateSets design-time data for a control. (Inherited from Control.)
Public methodSetRenderMethodDelegateInfrastructure. Assigns an event handler delegate to render the server control and its content into its parent control. (Inherited from Control.)
Public methodSetTraceData(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 methodSetTraceData(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 methodToStringReturns a string that represents the current object. (Inherited from Object.)
Protected methodTrackViewStateCauses the control to track changes to its view state so they can be stored in the object's ViewState property. (Inherited from WebControl.)
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  NameDescription
Public eventDataBindingOccurs when the server control binds to a data source. (Inherited from Control.)
Public eventDisposedOccurs 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 eventInitOccurs when the server control is initialized, which is the first step in its lifecycle. (Inherited from Control.)
Public eventLoadOccurs when the server control is loaded into the Page object. (Inherited from Control.)
Public eventPreRenderOccurs after the Control object is loaded but prior to rendering. (Inherited from Control.)
Public eventTextChangedOccurs when the content of the text box changes between posts to the server.
Public eventUnloadOccurs when the server control is unloaded from memory. (Inherited from Control.)
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  NameDescription
Public Extension MethodFindDataSourceControlReturns the data source that is associated with the data control for the specified control. (Defined by DynamicDataExtensions.)
Public Extension MethodFindFieldTemplateReturns the field template for the specified column in the specified control's naming container. (Defined by DynamicDataExtensions.)
Public Extension MethodFindMetaTableReturns the metatable object for the containing data control. (Defined by DynamicDataExtensions.)
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  NameDescription
Explicit interface implemetationPrivate methodIAttributeAccessor::GetAttributeInfrastructure. Gets an attribute of the Web control with the specified name. (Inherited from WebControl.)
Explicit interface implemetationPrivate methodIAttributeAccessor::SetAttributeSets an attribute of the Web control to the specified name and value. (Inherited from WebControl.)
Explicit interface implemetationPrivate propertyIControlBuilderAccessor::ControlBuilderFor a description of this member, see IControlBuilderAccessor::ControlBuilder. (Inherited from Control.)
Explicit interface implemetationPrivate methodIControlDesignerAccessor::GetDesignModeStateFor a description of this member, see IControlDesignerAccessor::GetDesignModeState. (Inherited from Control.)
Explicit interface implemetationPrivate methodIControlDesignerAccessor::SetDesignModeStateFor a description of this member, see IControlDesignerAccessor::SetDesignModeState. (Inherited from Control.)
Explicit interface implemetationPrivate methodIControlDesignerAccessor::SetOwnerControlInfrastructure. For a description of this member, see IControlDesignerAccessor::SetOwnerControl. (Inherited from Control.)
Explicit interface implemetationPrivate propertyIControlDesignerAccessor::UserDataFor a description of this member, see IControlDesignerAccessor::UserData. (Inherited from Control.)
Explicit interface implemetationPrivate propertyIDataBindingsAccessor::DataBindingsFor a description of this member, see IDataBindingsAccessor::DataBindings. (Inherited from Control.)
Explicit interface implemetationPrivate propertyIDataBindingsAccessor::HasDataBindingsFor a description of this member, see IDataBindingsAccessor::HasDataBindings. (Inherited from Control.)
Explicit interface implemetationPrivate propertyIExpressionsAccessor::ExpressionsFor a description of this member, see IExpressionsAccessor::Expressions. (Inherited from Control.)
Explicit interface implemetationPrivate propertyIExpressionsAccessor::HasExpressionsFor a description of this member, see IExpressionsAccessor::HasExpressions. (Inherited from Control.)
Explicit interface implemetationPrivate methodIParserAccessor::AddParsedSubObjectFor a description of this member, see IParserAccessor::AddParsedSubObject. (Inherited from Control.)
Explicit interface implemetationPrivate methodIPostBackDataHandler::LoadPostDataInfrastructure. Loads the posted text box content if it is different from the last posting.
Explicit interface implemetationPrivate methodIPostBackDataHandler::RaisePostDataChangedEventInfrastructure. Invokes the OnTextChanged method whenever posted data for the text box has changed.
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In this topic:

Introduction

The TextBox server control is an input control that lets the user enter text. By default, the TextMode property of the control is set to TextBoxMode.SingleLine, which displays a single-line text box. However, you can also use the TextBox control to display a multiline text box or a text box that masks user input by changing the value of the TextMode property to TextBoxMode.MultiLine or TextBoxMode.Password, respectively. The text displayed in the TextBox control is specified or determined by using the Text property.

The TextBox control contains several properties that allow you to control the appearance of the control. The display width of the text box, in characters, is determined by its Columns property. If the TextBox control is a multiline text box, the number of rows it displays is determined by the Rows property. To display text that wraps within the TextBox control, set the Wrap property to true.

You can also specify how data is entered in the TextBox control by setting a few properties. To prevent the text displayed in the control from being modified, set the ReadOnly property to true. If you want to limit the user input to a specified number of characters, set the MaxLength property.

For a list of initial property values for an instance of TextBox, see the TextBox constructor.

Caution noteCaution

This control can be used to accept user input, which might include malicious client script. Check any information that is sent from a client for executable script, SQL statements, or other code before displaying it in your application. You can use validation controls to verify user input before displaying the input text in a control. ASP.NET provides an input request validation feature to block script and HTML in user input. For more information, see Securing Standard ControlsHow to: Protect Against Script Exploits in a Web Application by Applying HTML Encoding to Strings, and Validating User Input in ASP.NET Web Pages.

Declarative Syntax

<asp:TextBox
    AccessKey="string"
    AutoCompleteType="None|Disabled|Cellular|Company|Department|
        DisplayName|Email|FirstName|Gender|HomeCity|HomeCountryRegion|
        HomeFax|HomePhone|HomeState|HomeStreetAddress|HomeZipCode|
        Homepage|JobTitle|LastName|MiddleName|Notes|Office|Pager|
        BusinessCity|BusinessCountryRegion|BusinessFax|BusinessPhone|
        BusinessState|BusinessStreetAddress|BusinessUrl|
        BusinessZipCode|Search"
    AutoPostBack="True|False"
    BackColor="color name|#dddddd"
    BorderColor="color name|#dddddd"
    BorderStyle="NotSet|None|Dotted|Dashed|Solid|Double|Groove|Ridge|
        Inset|Outset"
    BorderWidth="size"
    CausesValidation="True|False"
    Columns="integer"
    CssClass="string"
    Enabled="True|False"
    EnableTheming="True|False"
    EnableViewState="True|False"
    Font-Bold="True|False"
    Font-Italic="True|False"
    Font-Names="string"
    Font-Overline="True|False"
    Font-Size="string|Smaller|Larger|XX-Small|X-Small|Small|Medium|
        Large|X-Large|XX-Large"
    Font-Strikeout="True|False"
    Font-Underline="True|False"
    ForeColor="color name|#dddddd"
    Height="size"
    ID="string"
    MaxLength="integer"
    OnDataBinding="DataBinding event handler"
    OnDisposed="Disposed event handler"
    OnInit="Init event handler"
    OnLoad="Load event handler"
    OnPreRender="PreRender event handler"
    OnTextChanged="TextChanged event handler"
    OnUnload="Unload event handler"
    ReadOnly="True|False"
    Rows="integer"
    runat="server"
    SkinID="string"
    Style="string"
    TabIndex="integer"
    Text="string"
    TextMode="SingleLine|MultiLine|Password"
    ToolTip="string"
    ValidationGroup="string"
    Visible="True|False"
    Width="size"
    Wrap="True|False"
/>
TopicLocation
How to: Get and Set Values in TextBox Web Server ControlsBuilding ASP .NET Web Applications
How to: Respond to Changes in a TextBox Web Server ControlBuilding ASP .NET Web Applications
How to: Set ASP.NET Web Server Control PropertiesBuilding ASP .NET Web Applications
How to: Set a TextBox Web Server Control for Password EntryBuilding ASP .NET Web Applications
How to: Protect Against Script Exploits in a Web Application by Applying HTML Encoding to StringsBuilding ASP .NET Web Applications
How to: Set Focus on ASP.NET Web Server ControlsBuilding ASP .NET Web Applications
How to: Specify Multiline Input for a TextBox Web Server ControlBuilding ASP .NET Web Applications
How to: Get and Set Values in TextBox Web Server ControlsBuilding ASP .NET Web Applications
How to: Respond to Changes in a TextBox Web Server ControlBuilding ASP .NET Web Applications
How to: Set ASP.NET Web Server Control PropertiesBuilding ASP .NET Web Applications
How to: Set a TextBox Web Server Control for Password EntryBuilding ASP .NET Web Applications
How to: Protect Against Script Exploits in a Web Application by Applying HTML Encoding to StringsBuilding ASP .NET Web Applications
How to: Set Focus on ASP.NET Web Server ControlsBuilding ASP .NET Web Applications
How to: Specify Multiline Input for a TextBox Web Server ControlBuilding ASP .NET Web Applications
Walkthrough: Creating and Using ASP.NET Master Pages in Visual Web DeveloperBuilding ASP .NET Web Applications in Visual Studio
Walkthrough: Validating User Input in a Web Forms PageBuilding ASP .NET Web Applications in Visual Studio
Walkthrough: Working with Cascading Style Sheet Styles in Visual Web DeveloperBuilding ASP .NET Web Applications in Visual Studio
Walkthrough: Data Binding to a Custom Business ObjectBuilding ASP .NET Web Applications in Visual Studio
Walkthrough: Creating a Basic Web Page in Visual Web DeveloperBuilding ASP .NET Web Applications in Visual Studio

A Visual Studio Web site project with source code is available to accompany this topic: Download.

The following code example demonstrates how to use the TextBox control to get user input. When the user clicks the Add button, the sum of the values entered in the text boxes is displayed.

Security noteSecurity 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.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 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.
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