Retrieving SQL Server output variables in c#

Question

I have a stored procedure:

ALTER PROCEDURE [dbo].[pr_Tbl_Test_Insert]
    @guidid uniqueidentifier output,
    @sname nvarchar(50)
AS
-- INSERT a new row in          


        

Answer 1

Before you execute the query you need to specify the direction of the parameter, in this case output. e.g.:

cmd.Parameters.AddWithValue("@guidid",_id);//_id is SqlGuid

cmd.Parameters.AddWithValue("@sname", "mehdi");

cmd.Parameters["@guidid"].Direction = ParameterDirection.Output

cmd.ExecuteNonQuery();
MessageBox.Show(cmd.Parameters["@guidid"].Value.ToString());