ControlDesignerGetErrorDesignTimeHtml Method

Retrieves the HTML markup that provides information about the specified exception.

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

protected virtual string GetErrorDesignTimeHtml(
	Exception e
virtual String^ GetErrorDesignTimeHtml(
	Exception^ e
abstract GetErrorDesignTimeHtml : 
        e:Exception -> string
override GetErrorDesignTimeHtml : 
        e:Exception -> string
Protected Overridable Function GetErrorDesignTimeHtml (
	e As Exception
) As String



The exception that occurred.

Return Value


The design-time HTML markup for the specified exception.


The GetErrorDesignTimeHtml method is typically called, if an exception is thrown in the GetDesignTimeHtml method.

Notes to Inheritors:

The typical design pattern is to try to get HTML markup through the associated control, and then if an error is encountered, call the GetErrorDesignTimeHtml method. If no markup is returned by the control, call the GetEmptyDesignTimeHtml method, which if it is not overridden to provide specific markup, calls the CreatePlaceHolderDesignTimeHtml method, which should contain information about the type and ID of the control.


The following code example demonstrates how to generate design-time HTML markup for the control when an error occurs and call the CreatePlaceHolderDesignTimeHtml method.

// Generate the design-time markup for the control when an error occurs.
protected override string GetErrorDesignTimeHtml(Exception e) 
    // Write the error message text in red, bold.
    string errorRendering =
        "<span style=\"font-weight:bold; color:Red; \">" +
        e.Message + "</span>";

    return CreatePlaceHolderDesignTimeHtml(errorRendering);
} // GetErrorDesignTimeHtml
' Generate the design-time markup for the control when an error occurs.
Protected Overrides Function GetErrorDesignTimeHtml( _
    ByVal ex As Exception) As String

    ' Write the error message text in red, bold.
    Dim errorRendering As String = _
        "<span style=""font-weight:bold; color:Red; "">" & _
        ex.Message & "</span>"

    Return CreatePlaceHolderDesignTimeHtml(errorRendering)

End Function ' GetErrorDesignTimeHtml
Version Information
.NET Framework
Available since 1.1
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