I have the following code as part of an sqlcommand which is calling a stored procedure:

Dim groupObj

If groupId = 0 Then
    groupObj = DBNull.Value
Else
    groupObj = groupId
End If

Dim siteObj

If siteId = 0 Then
    siteObj = DBNull.Value
Else
    siteObj = siteId
End If

sqlCommand.Parameters.Add(New SqlClient.SqlParameter("GroupID", SqlDbType.Decimal)).Value = groupObj
sqlCommand.Parameters.Add(New SqlClient.SqlParameter("SiteID", SqlDbType.Decimal)).Value = siteObj

I basically want to check for a condition and (if true) send a DBNull instead. This code looks awful however - is there a way to succinct this up?