I&#039;m trying to set the properties using the code<BR>Dim cat As Catalog = New Catalog<BR>Dim Cn As ADODB.Connection = New ADODB.Connection<BR>Cn.Open(myConn.ConnectionStrin g)<BR>cat.Tables("tableName").Columns("field").Pro perties.Item("Nullable").Value = True<BR>But it doesn&#039;t work, and I get the error<BR>Exception Details: System.Runtime.InteropServices.COMException: Interface not registered<BR>It seems that Columns exists, but not Columns.Properties. <BR>Has anyone got any ideas, why it&#039;s not working, <BR>Thanks<BR>Peter