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DataGridDesigner.GetErrorDesignTimeHtml Method

Gets the HTML markup displayed at design time for the specified exception when an error has been encountered while rendering the control.

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

protected override string GetErrorDesignTimeHtml (
	Exception e
protected String GetErrorDesignTimeHtml (
	Exception e
protected override function GetErrorDesignTimeHtml (
	e : Exception
) : String



The exception that occurred.

Return Value

The HTML markup displayed at design time for the specified exception.

The following code example shows how to override the GetErrorDesignTimeHtml method to modify the appearance of the DataGrid control on the design surface when an exception occurs.

This code example is part of a larger example provided for the DataGridDesigner class.

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>"
        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

  • Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see .

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0, 1.1, 1.0