DataGridDesigner Class

.NET Framework (current version)
 

Extends design-time behavior for the DataGrid Web server control.

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

System::Object
  System.ComponentModel.Design::ComponentDesigner
    System.Web.UI.Design::HtmlControlDesigner
      System.Web.UI.Design::ControlDesigner
        System.Web.UI.Design::TemplatedControlDesigner
          System.Web.UI.Design.WebControls::BaseDataListDesigner
            System.Web.UI.Design.WebControls::DataGridDesigner

C#
C++
F#
VB
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[SupportsPreviewControlAttribute(true)]
[SecurityPermissionAttribute(SecurityAction::Demand, Flags = SecurityPermissionFlag::UnmanagedCode)]
public ref class DataGridDesigner : BaseDataListDesigner

NameDescription
System_CAPS_pubmethodDataGridDesigner()

Initializes a new instance of the DataGridDesigner class.

NameDescription
System_CAPS_pubpropertyActionLists

Gets the designer action list collection for this designer.(Inherited from BaseDataListDesigner.)

System_CAPS_pubpropertyActiveTemplateEditingFrame

Obsolete. Gets the active template editing frame.(Inherited from TemplatedControlDesigner.)

System_CAPS_pubpropertyAllowResize

Gets a value indicating whether the control can be resized in the design-time environment.(Inherited from ControlDesigner.)

System_CAPS_pubpropertyAssociatedComponents

Gets the collection of components associated with the component managed by the designer.(Inherited from ComponentDesigner.)

System_CAPS_pubpropertyAutoFormats

Gets the DesignerAutoFormatCollection object associated with this designer.(Overrides ControlDesigner::AutoFormats.)

System_CAPS_pubpropertyBehavior

Obsolete. Gets or sets the DHTML behavior that is associated with the designer.(Inherited from HtmlControlDesigner.)

System_CAPS_pubpropertyCanEnterTemplateMode

Gets a value indicating whether or not this designer will allow the viewing or editing of templates.(Inherited from TemplatedControlDesigner.)

System_CAPS_pubpropertyComponent

Gets the component this designer is designing.(Inherited from ComponentDesigner.)

System_CAPS_pubpropertyDataBindings

Gets the data bindings collection for the current control.(Inherited from HtmlControlDesigner.)

System_CAPS_protpropertyDataBindingsEnabled

This API supports the product infrastructure and is not intended to be used directly from your code. Gets a value indicating whether the designer allows data binding. (Inherited from TemplatedControlDesigner.)

System_CAPS_pubpropertyDataKeyField

Gets or sets the value of the data key field of the associated control.(Inherited from BaseDataListDesigner.)

System_CAPS_pubpropertyDataMember

Gets or sets the value of the data member field of the associated control.(Inherited from BaseDataListDesigner.)

System_CAPS_pubpropertyDataSource

Gets or sets the value of the data source property of the associated control.(Inherited from BaseDataListDesigner.)

System_CAPS_pubpropertyDataSourceDesigner

Gets the designer of the data source, when one is selected for data binding.(Inherited from BaseDataListDesigner.)

System_CAPS_pubpropertyDataSourceID

Gets or sets the designer's version of the data source ID property and is used to shadow the corresponding property of the associated control.(Inherited from BaseDataListDesigner.)

System_CAPS_protpropertyDesignerState

Gets an object that is used to persist data for the associated control at design time.(Inherited from ControlDesigner.)

System_CAPS_pubpropertyDesignerView

Gets the default view of the data source that is bound to the associated control. (Inherited from BaseDataListDesigner.)

System_CAPS_protpropertyDesignTimeElement

Obsolete. Gets the design-time object representing the control that is associated with the HtmlControlDesigner object on the design surface.(Inherited from HtmlControlDesigner.)

System_CAPS_protpropertyDesignTimeElementView

Obsolete. Gets the view-control object for the control designer.(Inherited from ControlDesigner.)

System_CAPS_pubpropertyDesignTimeHtmlRequiresLoadComplete

Obsolete. Gets a value indicating whether the design host must finish loading before the GetDesignTimeHtml method can be called.(Inherited from ControlDesigner.)

System_CAPS_pubpropertyExpressions

Gets the expression bindings for the current control at design time.(Inherited from HtmlControlDesigner.)

System_CAPS_protpropertyHidePropertiesInTemplateMode

This API supports the product infrastructure and is not intended to be used directly from your code. Gets a value indicating whether the properties of the associated control are hidden when the control is in template mode.(Inherited from ControlDesigner.)

System_CAPS_pubpropertyID

Gets or sets the ID string for the control.(Inherited from ControlDesigner.)

System_CAPS_protpropertyInheritanceAttribute

Gets an attribute that indicates the type of inheritance of the associated component.(Inherited from ComponentDesigner.)

System_CAPS_protpropertyInherited

Gets a value indicating whether this component is inherited.(Inherited from ComponentDesigner.)

System_CAPS_pubpropertyInTemplateMode

Obsolete. Gets a value indicating whether the designer document is in template mode.(Inherited from TemplatedControlDesigner.)

System_CAPS_pubpropertyIsDirty

Obsolete. Gets or sets a value indicating whether the Web server control has been marked as changed.(Inherited from ControlDesigner.)

System_CAPS_protpropertyParentComponent

Gets the parent component for this designer.(Inherited from ComponentDesigner.)

System_CAPS_pubpropertyReadOnly

Obsolete. Gets or sets a value indicating whether the properties of the control are read-only at design time.(Inherited from ControlDesigner.)

System_CAPS_protpropertyRootDesigner

Gets the control designer for the Web Forms page that contains the associated control.(Inherited from ControlDesigner.)

System_CAPS_protpropertyShadowProperties

Gets a collection of property values that override user settings.(Inherited from ComponentDesigner.)

System_CAPS_pubpropertyShouldCodeSerialize

Obsolete. Gets or sets a value indicating whether to create a field declaration for the control in the code-behind file for the current design document during serialization.(Inherited from HtmlControlDesigner.)

System_CAPS_protpropertyTag

Gets an object representing the HTML markup element for the associated control.(Inherited from ControlDesigner.)

System_CAPS_pubpropertyTemplateGroups

Gets a collection of template groups, each containing a template definition.(Inherited from TemplatedControlDesigner.)

System_CAPS_protpropertyUsePreviewControl

Gets a value indicating whether the control designer uses a temporary preview control to generate the design-time HTML markup.(Inherited from ControlDesigner.)

System_CAPS_pubpropertyVerbs

Gets the design-time verbs supported by the component that is associated with the designer.(Inherited from ComponentDesigner.)

System_CAPS_pubpropertyViewControl

Gets or sets a Web server control that can be used for previewing the design-time HTML markup.(Inherited from ControlDesigner.)

System_CAPS_pubpropertyViewControlCreated

Gets or sets a value indicating whether a View control has been created for display on the design surface.(Inherited from ControlDesigner.)

System_CAPS_protpropertyVisible

Gets a value that indicates whether the control is visible at design time.(Inherited from ControlDesigner.)

NameDescription
System_CAPS_protmethodCreateErrorDesignTimeHtml(String^)

Creates HTML markup to display a specified error message at design time.(Inherited from ControlDesigner.)

System_CAPS_protmethodCreateErrorDesignTimeHtml(String^, Exception^)

Creates the HTML markup to display a specified exception error message at design time.(Inherited from ControlDesigner.)

System_CAPS_protmethodCreatePlaceHolderDesignTimeHtml()

Provides a simple rectangular placeholder representation that displays the type and ID of the control.(Inherited from ControlDesigner.)

System_CAPS_protmethodCreatePlaceHolderDesignTimeHtml(String^)

Provides a simple rectangular placeholder representation that displays the type and ID of the control, and also additional specified instructions or information.(Inherited from ControlDesigner.)

System_CAPS_protmethodCreateTemplateEditingFrame(TemplateEditingVerb^)

Obsolete. Creates a template editing frame using the specified verb.(Overrides TemplatedControlDesigner::CreateTemplateEditingFrame(TemplateEditingVerb^).)

System_CAPS_protmethodCreateViewControl()

Returns a copy of the associated control for viewing or rendering on the design surface.(Inherited from ControlDesigner.)

System_CAPS_pubmethodDispose()

Releases all resources used by the ComponentDesigner.(Inherited from ComponentDesigner.)

System_CAPS_protmethodDispose(Boolean)

Releases the unmanaged resources used by the DataGridDesigner object and optionally releases the managed resources.(Overrides BaseDataListDesigner::Dispose(Boolean).)

System_CAPS_pubmethodDoDefaultAction()

Creates a method signature in the source code file for the default event on the component and navigates the user's cursor to that location.(Inherited from ComponentDesigner.)

System_CAPS_pubmethodEnterTemplateMode(ITemplateEditingFrame^)

Obsolete. Opens a particular template frame object for editing in the designer.(Inherited from TemplatedControlDesigner.)

System_CAPS_pubmethodEquals(Object^)

Determines whether the specified object is equal to the current object.(Inherited from Object.)

System_CAPS_pubmethodExitTemplateMode(Boolean, Boolean, Boolean)

Obsolete. Closes the currently active template editing frame after saving any relevant changes.(Inherited from TemplatedControlDesigner.)

System_CAPS_protmethodFinalize()

Attempts to free resources by calling Dispose(false) before the object is reclaimed by garbage collection.(Inherited from ComponentDesigner.)

System_CAPS_pubmethodGetBounds()

Retrieves the coordinates of the rectangle representing the boundaries for the control as displayed on the design surface.(Inherited from ControlDesigner.)

System_CAPS_protmethodGetCachedTemplateEditingVerbs()

Obsolete. Gets the cached template editing verbs available to the designer.(Overrides TemplatedControlDesigner::GetCachedTemplateEditingVerbs().)

System_CAPS_protmethodGetDesignTimeDataSource(IEnumerable^, Int32, Boolean%)

Generates an object that can be used as a data source at design time.(Inherited from BaseDataListDesigner.)

System_CAPS_protmethodGetDesignTimeDataSource(Int32, Boolean%)

Generates an object that can be used as a data source at design time.(Inherited from BaseDataListDesigner.)

System_CAPS_pubmethodGetDesignTimeHtml()

Gets the HTML markup used to represent the DataGrid control at design time.(Overrides ControlDesigner::GetDesignTimeHtml().)

System_CAPS_pubmethodGetDesignTimeHtml(DesignerRegionCollection^)

Retrieves the HTML markup to display the control and populates the collection with the current control designer regions.(Inherited from ControlDesigner.)

System_CAPS_pubmethodGetEditableDesignerRegionContent(EditableDesignerRegion^)

Returns the content for an editable region of the design-time view of the associated control.(Inherited from ControlDesigner.)

System_CAPS_protmethodGetEmptyDesignTimeHtml()

Gets the HTML markup used to represent an empty template-based control at design time.(Overrides ControlDesigner::GetEmptyDesignTimeHtml().)

System_CAPS_protmethodGetErrorDesignTimeHtml(Exception^)

Gets the HTML markup displayed at design time for the specified exception when an error has been encountered while rendering the control.(Overrides ControlDesigner::GetErrorDesignTimeHtml(Exception^).)

System_CAPS_pubmethodGetHashCode()

Serves as the default hash function. (Inherited from Object.)

System_CAPS_pubmethodGetPersistenceContent()

Retrieves the persistable inner HTML markup of the control at design time.(Inherited from ControlDesigner.)

System_CAPS_pubmethodGetPersistInnerHtml()

Obsolete. Retrieves the persistable inner HTML markup of the control.(Inherited from ControlDesigner.)

System_CAPS_pubmethodGetResolvedSelectedDataSource()

Gets the data source component from the associated control container, resolved to a specific data member.(Inherited from BaseDataListDesigner.)

System_CAPS_pubmethodGetSelectedDataSource()

Gets the data source component from the associated control container.(Inherited from BaseDataListDesigner.)

System_CAPS_protmethodGetService(Type^)

Attempts to retrieve the specified type of service from the design mode site of the designer's component.(Inherited from ComponentDesigner.)

System_CAPS_pubmethodGetTemplateContainerDataItemProperty(String^)

Obsolete. Gets the data item property of the template container.(Overrides TemplatedControlDesigner::GetTemplateContainerDataItemProperty(String^).)

System_CAPS_pubmethodGetTemplateContainerDataSource(String^)

Obsolete. Gets the data source of the template's container.(Inherited from BaseDataListDesigner.)

System_CAPS_pubmethodGetTemplateContent(ITemplateEditingFrame^, String^, Boolean%)

Obsolete. Gets the content of the template.(Overrides TemplatedControlDesigner::GetTemplateContent(ITemplateEditingFrame^, String^, Boolean%).)

System_CAPS_pubmethodGetTemplateEditingVerbs()

Obsolete. Gets the template editing verbs available to the designer.(Inherited from TemplatedControlDesigner.)

System_CAPS_protmethodGetTemplateFromText(String^)

Creates a template from the specified text.(Inherited from TemplatedControlDesigner.)

System_CAPS_pubmethodGetTemplatePropertyParentType(String^)

Obsolete. Gets the Type object corresponding to the parent of the specified template.(Overrides TemplatedControlDesigner::GetTemplatePropertyParentType(String^).)

System_CAPS_protmethodGetTextFromTemplate(ITemplate^)

Gets a string of text that represents the specified template.(Inherited from TemplatedControlDesigner.)

System_CAPS_pubmethodGetType()

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_pubmethodGetViewRendering()

Retrieves an object that contains the design-time markup for the content and regions of the associated control.(Inherited from ControlDesigner.)

System_CAPS_pubmethodInitialize(IComponent^)

Initializes the designer with the specified DataGrid control.(Overrides BaseDataListDesigner::Initialize(IComponent^).)

System_CAPS_pubmethodInitializeExistingComponent(IDictionary^)

Reinitializes an existing component.(Inherited from ComponentDesigner.)

System_CAPS_pubmethodInitializeNewComponent(IDictionary^)

Initializes a newly created component.(Inherited from ComponentDesigner.)

System_CAPS_pubmethodInitializeNonDefault()

Obsolete. Initializes the settings for an imported component that is already initialized to settings other than the defaults.(Inherited from ComponentDesigner.)

System_CAPS_pubmethodInvalidate()

Invalidates the whole area of the control that is displayed on the design surface and signals the control designer to redraw the control.(Inherited from ControlDesigner.)

System_CAPS_pubmethodInvalidate(Rectangle)

Invalidates the specified area of the control that is displayed on the design surface and signals the control designer to redraw the control.(Inherited from ControlDesigner.)

System_CAPS_protmethodInvokeGetInheritanceAttribute(ComponentDesigner^)

Gets the InheritanceAttribute of the specified ComponentDesigner.(Inherited from ComponentDesigner.)

System_CAPS_protmethodInvokePropertyBuilder(Int32)

Invokes a component editor for the associated control.(Inherited from BaseDataListDesigner.)

System_CAPS_pubmethodIsPropertyBound(String^)

Obsolete. Retrieves a value indicating whether the specified property on the associated control is data-bound.(Inherited from ControlDesigner.)

System_CAPS_pubmethodLocalize(IDesignTimeResourceWriter^)

Uses the provided resource writer to persist the localizable properties of the associated control to a resource in the design host.(Inherited from ControlDesigner.)

System_CAPS_protmethodMemberwiseClone()

Creates a shallow copy of the current Object.(Inherited from Object.)

System_CAPS_protmethodOnAutoFormat(Object^, EventArgs^)

Obsolete. Handles the AutoFormat event.(Inherited from BaseDataListDesigner.)

System_CAPS_pubmethodOnAutoFormatApplied(DesignerAutoFormat^)

Called when an automatic formatting scheme has been applied to the associated control.(Inherited from BaseDataListDesigner.)

System_CAPS_protmethodOnBehaviorAttached()

Obsolete. Provides an opportunity to perform additional processing when a behavior is attached to the designer.(Inherited from TemplatedControlDesigner.)

System_CAPS_protmethodOnBehaviorDetaching()

Obsolete. Called when a behavior disassociates from the element.(Inherited from HtmlControlDesigner.)

System_CAPS_protmethodOnBindingsCollectionChanged(String^)

Obsolete. Called when the data-binding collection changes.(Inherited from ControlDesigner.)

System_CAPS_protmethodOnClick(DesignerRegionMouseEventArgs^)

Called by the design host when the user clicks the associated control at design time.(Inherited from ControlDesigner.)

System_CAPS_pubmethodOnColumnsChanged()

Called when the columns of the template change.

System_CAPS_pubmethodOnComponentChanged(Object^, ComponentChangedEventArgs^)

Called when there is a change to the associated control.(Inherited from BaseDataListDesigner.)

System_CAPS_pubmethodOnComponentChanging(Object^, ComponentChangingEventArgs^)

Represents the method that will handle the ComponentChanging event for the associated control. (Inherited from ControlDesigner.)

System_CAPS_protmethodOnControlResize()

Obsolete. Called when the associated Web server control has been resized in the design host at design time.(Inherited from ControlDesigner.)

System_CAPS_protmethodOnDataSourceChanged()

Called when the data source for the associated control has changed.(Inherited from BaseDataListDesigner.)

System_CAPS_protmethodOnPaint(PaintEventArgs^)

Called when the control designer draws the associated control on the design surface, if the CustomPaint value is true.(Inherited from ControlDesigner.)

System_CAPS_protmethodOnPropertyBuilder(Object^, EventArgs^)

Represents the method that handles the property-builder event.(Inherited from BaseDataListDesigner.)

System_CAPS_protmethodOnSchemaRefreshed()

Called when the schema of the data source for the associated control changes.(Inherited from BaseDataListDesigner.)

System_CAPS_pubmethodOnSetComponentDefaults()

Obsolete. Sets the default properties for the component.(Inherited from ComponentDesigner.)

System_CAPS_pubmethodOnSetParent()

Provides an opportunity to perform additional processing when the parent of this designer is changed.(Inherited from TemplatedControlDesigner.)

System_CAPS_protmethodOnStylesChanged()

Can be overridden to implement functionality that should occur when a style of the associated control has changed.(Inherited from BaseDataListDesigner.)

System_CAPS_protmethodOnTemplateEditingVerbsChanged()

Called when the template editing verbs change.(Overrides BaseDataListDesigner::OnTemplateEditingVerbsChanged().)

System_CAPS_protmethodOnTemplateModeChanged()

Provides an opportunity to perform additional processing when the template mode is changed.(Inherited from TemplatedControlDesigner.)

System_CAPS_protmethodPostFilterAttributes(IDictionary^)

Allows a designer to change or remove items from the set of attributes that it exposes through a TypeDescriptor.(Inherited from ComponentDesigner.)

System_CAPS_protmethodPostFilterEvents(IDictionary^)

Allows a designer to change or remove items from the set of events that it exposes through a TypeDescriptor.(Inherited from ComponentDesigner.)

System_CAPS_protmethodPostFilterProperties(IDictionary^)

Allows a designer to change or remove items from the set of properties that it exposes through a TypeDescriptor.(Inherited from ComponentDesigner.)

System_CAPS_protmethodPreFilterAttributes(IDictionary^)

Allows a designer to add to the set of attributes that it exposes through a TypeDescriptor.(Inherited from ComponentDesigner.)

System_CAPS_protmethodPreFilterEvents(IDictionary^)

Sets the list of events that are exposed at design-time for the TypeDescriptor object for the component.(Inherited from HtmlControlDesigner.)

System_CAPS_protmethodPreFilterProperties(IDictionary^)

Used by the designer to remove properties from or add additional properties to the display in the Properties grid or to shadow properties of the associated control. (Inherited from BaseDataListDesigner.)

System_CAPS_protmethodRaiseComponentChanged(MemberDescriptor^, Object^, Object^)

Notifies the IComponentChangeService that this component has been changed.(Inherited from ComponentDesigner.)

System_CAPS_protmethodRaiseComponentChanging(MemberDescriptor^)

Notifies the IComponentChangeService that this component is about to be changed.(Inherited from ComponentDesigner.)

System_CAPS_pubmethodRaiseResizeEvent()

Obsolete. Raises the OnControlResize event.(Inherited from ControlDesigner.)

System_CAPS_pubmethodRegisterClone(Object^, Object^)

Registers internal data in a cloned control.(Inherited from ControlDesigner.)

System_CAPS_protmethodSaveActiveTemplateEditingFrame()

Saves the active template editing frame.(Inherited from TemplatedControlDesigner.)

System_CAPS_pubmethodSetEditableDesignerRegionContent(EditableDesignerRegion^, String^)

Specifies the content for an editable region of the control at design time. (Inherited from ControlDesigner.)

System_CAPS_protmethodSetRegionContent(EditableDesignerRegion^, String^)

Specifies the content for an editable region in the design-time view of the control.(Inherited from ControlDesigner.)

System_CAPS_pubmethodSetTemplateContent(ITemplateEditingFrame^, String^, String^)

Obsolete. Sets the content for the specified template and frame.(Overrides TemplatedControlDesigner::SetTemplateContent(ITemplateEditingFrame^, String^, String^).)

System_CAPS_protmethodSetViewFlags(ViewFlags, Boolean)

Assigns the specified bitwise ViewFlags enumeration to the specified flag value.(Inherited from ControlDesigner.)

System_CAPS_pubmethodToString()

Returns a string that represents the current object.(Inherited from Object.)

System_CAPS_pubmethodUpdateDesignTimeHtml()

Updates the design-time HTML.(Inherited from TemplatedControlDesigner.)

NameDescription
System_CAPS_pubinterfaceSystem_CAPS_privmethodIDesignerFilter::PostFilterAttributes(IDictionary^)

For a description of this member, see the IDesignerFilter::PostFilterAttributes method.(Inherited from ComponentDesigner.)

System_CAPS_pubinterfaceSystem_CAPS_privmethodIDesignerFilter::PostFilterEvents(IDictionary^)

For a description of this member, see the IDesignerFilter::PostFilterEvents method.(Inherited from ComponentDesigner.)

System_CAPS_pubinterfaceSystem_CAPS_privmethodIDesignerFilter::PostFilterProperties(IDictionary^)

For a description of this member, see the IDesignerFilter::PostFilterProperties method.(Inherited from ComponentDesigner.)

System_CAPS_pubinterfaceSystem_CAPS_privmethodIDesignerFilter::PreFilterAttributes(IDictionary^)

For a description of this member, see the IDesignerFilter::PreFilterAttributes method.(Inherited from ComponentDesigner.)

System_CAPS_pubinterfaceSystem_CAPS_privmethodIDesignerFilter::PreFilterEvents(IDictionary^)

For a description of this member, see the IDesignerFilter::PreFilterEvents method.(Inherited from ComponentDesigner.)

System_CAPS_pubinterfaceSystem_CAPS_privmethodIDesignerFilter::PreFilterProperties(IDictionary^)

For a description of this member, see the IDesignerFilter::PreFilterProperties method.(Inherited from ComponentDesigner.)

System_CAPS_pubinterfaceSystem_CAPS_privmethodIDataBindingSchemaProvider::RefreshSchema(Boolean)

For a description of this member, see RefreshSchema.(Inherited from BaseDataListDesigner.)

System_CAPS_pubinterfaceSystem_CAPS_privpropertyITreeDesigner::Children

For a description of this member, see the ITreeDesigner::Children property.(Inherited from ComponentDesigner.)

System_CAPS_pubinterfaceSystem_CAPS_privpropertyITreeDesigner::Parent

For a description of this member, see the ITreeDesigner::Parent property.(Inherited from ComponentDesigner.)

System_CAPS_pubinterfaceSystem_CAPS_privpropertyIDataBindingSchemaProvider::CanRefreshSchema

For a description of this member, see CanRefreshSchema.(Inherited from BaseDataListDesigner.)

System_CAPS_pubinterfaceSystem_CAPS_privpropertyIDataBindingSchemaProvider::Schema

For a description of this member, see Schema.(Inherited from BaseDataListDesigner.)

The following code example demonstrates how to extend the DataGridDesigner class. The code overrides the GetDesignTimeHtml method to customize the CellPadding, BorderWidth, and BorderColor properties when the DataGrid control is rendered on a design surface.

VB
Copy 
Imports System
Imports System.Diagnostics
Imports System.ComponentModel
Imports System.Drawing
Imports System.Web.UI.Design.WebControls
Imports System.Web.UI.WebControls

Namespace Examples.AspNet

    ' Create a designer class for the SimpleDataList class.
    <System.Security.Permissions.SecurityPermission( _
    System.Security.Permissions.SecurityAction.Demand, _
    Flags:=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)> _
    Public Class SimpleDataListDesigner
        Inherits DataListDesigner

        Private simpleList As SimpleDataList


        ' Override the GetDesignTimeHtml method to add style to the control
        ' on the design surface.
        Public Overrides Function GetDesignTimeHtml() As String
            ' Cast the control to the Component property of the designer.
            simpleList = CType(Component, SimpleDataList)

            Dim designTimeHtml As String = Nothing

            ' Create variables to hold current property values.
            Dim oldBorderWidth As Unit = simpleList.BorderWidth
            Dim oldBorderColor As Color = simpleList.BorderColor

            ' Set the properties and generate the design-time HTML.
            If (simpleList.Enabled) Then
                Try
                    simpleList.BorderWidth = Unit.Point(5)
                    simpleList.BorderColor = Color.Purple
                    designTimeHtml = MyBase.GetDesignTimeHtml()

                    ' Call the GetErrorDesignTimeHtml method if an
                    ' exception occurs.
                Catch ex As Exception
                    designTimeHtml = GetErrorDesignTimeHtml(ex)

                    ' Return the properties to their original settings.
                Finally
                    simpleList.BorderWidth = oldBorderWidth
                    simpleList.BorderColor = oldBorderColor
                End Try
                ' If the list is not enabled, call the GetEmptyDesignTimeHtml
                ' method.
            Else
                designTimeHtml = GetEmptyDesignTimeHtml()
            End If

            Return designTimeHtml

        End Function

        Protected Overrides Function GetEmptyDesignTimeHtml() As String
            Dim emptyText As String

            ' Check the CanEnterTemplateMode property to
            ' specify which text to display if ItemTemplate 
            ' does not contain a value.
            If CanEnterTemplateMode Then
                emptyText = _
                    "<b>Either the Enabled property value is false " + _
                    "or you need to set the ItemTemplate for this " + _
                    "control.<br>Right-click to edit templates.</b>"
            Else
                emptyText = _
                    "<b>You cannot edit templates in this view.<br>" + _
                    "Switch to HTML view to define the ItemTemplate.</b>"
            End If

            Return CreatePlaceHolderDesignTimeHtml(emptyText)
        End Function

        ' Generate HTML to indicate that an error has occurred.
        Protected Overrides Function GetErrorDesignTimeHtml(ByVal exc As _
            Exception) As String

            Return CreatePlaceHolderDesignTimeHtml( _
                "<b>An error occurred</b>.<br>Check to ensure that all " + _
                "properties are valid.")
        End Function


        ' Override the Initialize method to ensure that
        ' only an instance of the SimpleDataList class is
        ' used by this designer class.
        Public Overrides Sub Initialize(ByVal component As IComponent)
            simpleList = CType(component, SimpleDataList)

            If IsNothing(simpleList) Then
                Throw New ArgumentException("Must be a SimpleDataList.", "component")
            End If

            MyBase.Initialize(component)
        End Sub
    End Class
End Namespace

The following example shows how to use the DesignerAttribute attribute to associate the designer with the DataGrid control.

VB
Copy 
' Override the Initialize method to ensure that
' only an instance of the SimpleDataList class is
' used by this designer class.
Public Overrides Sub Initialize(ByVal component As IComponent)
    simpleList = CType(component, SimpleDataList)

    If IsNothing(simpleList) Then
        Throw New ArgumentException("Must be a SimpleDataList.", "component")
    End If

    MyBase.Initialize(component)
End Sub

.NET Framework
Available since 1.1

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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