Missing SP Parameter?

I've got a completely goofy problem on one development machine running Vista, SQL 2005 sp2, and Orcas Beta 2. I'm calling a stored proc from within my C# and my ExecuteDataReader() command fails saying I'm missing a parameter (which I'm not).

The c# looks like this:


if (SqlContext.IsAvailable)

{
using (System.Data.SqlClient.SqlConnection cnx =


new System.Data.SqlClient.SqlConnection("context connection=true"))

{


cnx.Open();

using (SqlCommand xCmd = new SqlCommand("dbo.TestMe", cnx))

{


xCmd.CommandType = CommandType.StoredProcedure;

xCmd.Parameters.Add(new System.Data.SqlClient.SqlParameter("myParam", SqlDbType.Int));

xCmd.Parameters.Add(new System.Data.SqlClient.SqlParameter("myStr",








SqlDbType.VarChar, 150));

xCmd.Parameters["myParam"].Value = 123;

xCmd.Parameters["myStr"].Value = "Hello";

xCmd.ExecuteNonQuery();

}
}

}

My Stored Proc look like this:


CREATE PROCEDURE [dbo].[TestMe]


@myParam as int,

@myStr as nvarchar(150)

AS

BEGIN


SELECT 1 as myCol

END



The result is a an exception that looks like this:


A .NET Framework error occurred during execution of user-defined routine or aggregate "StoredProcedure1":

System.Data.SqlClient.SqlException: Procedure or function 'TestMe' expects parameter '@myParam', which was not supplied.

If I run the SP from the Sql Workbench, it looks fine. Any ideas? I just repaved SQL and Orcas on this machine to see if I can fix the problem -- no luck.