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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 System.Design.dll)

protected override string GetErrorDesignTimeHtml(
	Exception e


Type: System.Exception

The exception that occurred.

Return Value

Type: System.String
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

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
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