Procedure or Function expects parameter which was not supplied in ASP.Net

How to bind the gridview using stored procedure and in stored procedure it is select the table using where condition. so error is occuring like this

SqlCommand cmd = new SqlCommand("LateReason", con);
cmd.CommandType = CommandType.StoredProcedure;
//cmd.Parameters.AddWithValue("@Desc", ObjBO.Desc);
SqlDataAdapter adp = new SqlDataAdapter(cmd);
adp.Fill(ds);
cmd.Dispose();

ALTER PROCEDURE [dbo].[LateReason] 
(
    @Desc varchar(50)
) 
AS
SELECT * FROM LateReason WHERE [Desc] = @Desc