ADO.NET :: How To Return Value In Stored Procedure

I have a stored procedure with 6 input parameter and 4 output parameter. In My asp.net - C# code I execute the stored procedure and return the parameter. Stored procedure executed correctly, but the return values are empty. I would like to show the return value on the page. Stored procedure works fine and return value in sql manager.

This is my code:

SqlCommand cmd = new SqlCommand("w_create_order", connection);
cmd.CommandType = CommandType.StoredProcedure;
//input parameters
cmd.Parameters.AddWithValue("@in_order_class", "WEB");
cmd.Parameters.AddWithValue("@in_owner_code", "OP");
cmd.Parameters.AddWithValue("@in_sales_campaign_code", "DEF");
cmd.Parameters.AddWithValue("@in_cus_key", null);
cmd.Parameters.AddWithValue("@in_lab_key", null);
cmd.Parameters.AddWithValue("@in_invoice_number", null);
connection.Open();
cmd.ExecuteNonQuery();
//output parameters
//output parameters
cmd.Parameters.Add("@ord_key", SqlDbType.Int, 500);
cmd.Parameters["@ord_key"].Direction = ParameterDirection.Output;
cmd.Parameters.Add("@ord_invoice_number", SqlDbType.Int, 500);
cmd.Parameters["@ord_invoice_number"].Direction = ParameterDirection.Output;
cmd.Parameters.Add("@via_ship_via_code", SqlDbType.NVarChar, 500);
cmd.Parameters["@via_ship_via_code"].Direction = ParameterDirection.Output;
string message = (string)cmd.Parameters["@via_ship_via_code"].Value;
cmd.Parameters.Add("@ord_ship_after_date", SqlDbType.DateTime);
cmd.Parameters["@ord_ship_after_date"].Direction = ParameterDirection.Output;
Label1.Text = message;
connection.Close();