' Define a custom class derived from the SqlDataSource Web control. 
Public Class SqlDataSourceWithBackup
    Inherits SqlDataSource

    Private _alternateConnectionString As String

    ' Define an alternate connection string, which could be used
    ' as a fallback value if the primary connection string fails.

    ' The EditorAttribute indicates the property can
    ' be edited at design-time with the ConnectionStringEditor class.
    <DefaultValue(""), _
     EditorAttribute(GetType(System.Web.UI.Design.ConnectionStringEditor), _
         GetType(System.Drawing.Design.UITypeEditor)), _
     Category("Data"), _
     Description("The alternate connection string.")> _
   Public Property AlternateConnectionString() As String

        Get
            Return _alternateConnectionString
        End Get
        Set(ByVal value As String)
            _alternateConnectionString = value
        End Set
    End Property

End Class