Executing an Oracle stored procedure using ODBC

I'm trying to execute an Oracle stored procedure in a VB.Net application. The code I am using is as follows:

Dim conn As New System.Data.Odbc.OdbcConnection
Dim ds As New DataSet
Try

conn.ConnectionString= "DSN=CO51D;uid=aasc;pwd=aasc"

conn.Open()
Dim mycmd As New OdbcCommand
mycmd.Connection = conn
mycmd.CommandText = "jonny"
mycmd.CommandType = CommandType.StoredProcedure
mycmd.ExecuteReader()

Catch x As Exception
MessageBox.Show(x.Message.ToString)
End Try

THe error message I get is ORA-00900; invalid SQL statement

yet the stored procedure works fine within a VB6 application.

Has anyone any suggestions or encountered anything similar?

Thanks

vbdotnetter