Hi,
not really but it's pretty trivial task to write such yourself. Like:
Public Class NZ
Public Shared Function ToString(ByVal obj As Object,replaceValue As
String) As String
If Convert.IsDBNull(obj) Then
Return replaceValue
Else
Return obj.ToString()
End If
End Function
'...
End Class
for working with strings. Then of course similar for every type you wish to
work with. With Convert.IsDBNull you can check if value equals to
DBNull.Value and utilize it.