Remove the parameters lines and changing the commandobject line to the following:

System.Data.OleDb.OleDbCommand oCmd = new OleDbCommand("PutResult('aaa','bbb')",oConn);

>Thanks. Then how does a value get assigned to the parameter?
>
>When I did this:
>

>oCmd.Parameters[0].Value="aaaa";
>oCmd.Parameters[1].Value="aaaa";
>

>I got the message "feature not available".
>
>And when I did this:
>

>oCmd.Parameters.Add(new OleDbParameter("cInputID",OleDbType.Char,60,"cInputID").Value="aaa");
>oCmd.Parameters.Add(new OleDbParameter("cInputResult",OleDbType.Char,4096,"cInputResult").Value="bbb");
>

>I got the message "An unhandled exception of type 'System.InvalidCastException' occurred in system.data.dll
>
>Additional information: The OleDbParameterCollection only accepts non-null OleDbParameter type objects, not String objects."
>
>?