Stored Procedure Into GridView

Info: (vs 2005, sql server 2005, asp 2.0, C# project)I need to pass a variable from my web form to a stored procedure which should return a dataset to a gridview.My stored proc works fine but it’s not returning properly (or at all). Here is my stored proc:set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go

ALTER PROCEDURE [dbo].[HrsUsed]
-- Add the parameters for the stored procedure here
@idUser INT
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;

-- Insert statements for procedure here

SELECT DATENAME(mm, leaveDate) + ' ' + DATENAME(yyyy, leaveDate) AS 'Leave Date', totalV, totalS
FROM tblLeave
WHERE idUser = @idUser
ORDER BY leaveDate DESC

RETURN

END

 Here is my code:
 try
{
SqlConnection cxnHrsUsed = new SqlConnection(ConfigurationManager.ConnectionStrings["cxnLeaveRecords"].ConnectionString);

SqlCommand cmdHrsUsed = new SqlCommand("HrsUsed", cxnHrsUsed);
cmdHrsUsed.CommandType = CommandType.StoredProcedure;

cmdHrsUsed.Parameters.Add("@idUser", SqlDbType.Int).Direction = ParameterDirection.Input;
cmdHoursUsed.Parameters["@idUser"].Value = Session["sessionUserID"];

cmdHrsUsed.Connection.Open();

gvHrsUsed.DataSource = cmdHrsUsed.ExecuteReader();
gvHrsUsed.DataBind();
cmdHrsUsed.Connection.Close();

}
catch (Exception ex)
{
lblStatus.Text = ex.Message;
}  I can see the caption of the gridview, but no data below it.
  Any ideas?