SQL Stored Procedure expects parameter, which was not supplied.

create PROCEDURE insertEmp(@Id int output,@Name varchar(50),@Sal money) AS
begin
    insert into EMP1(Empname,EmpSalary)values (@Name,@Sal)
    select @Id=@@Identity
END

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace SP2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
                InitializeComponent();
        }
 
	private void button1_Click(object sender, EventArgs e)
	{
		SqlConnection con = new SqlConnection(helpercs.connectionstring);
		SqlCommand cmd = new SqlCommand("insertEmp", con);
		cmd.CommandType=CommandType.StoredProcedure;
		SqlParameter parId, parName, parSalary;
		parId = cmd.Parameters.Add("@Id", SqlDbType.Int);
		parId.Direction = ParameterDirection.Output;
		parName = cmd.Parameters.Add("@name",SqlDbType.VarChar,50);
		parSalary = cmd.Parameters.Add("@salary",SqlDbType.Money);
		parName.Value =int.Parse(txtname.Text);
		parSalary.Value =int.Parse( txtsalary.Text);
		con.Open();
		cmd.ExecuteNonQuery();
		con.Close();
		txtid.Text = parId.Value.ToString();
	}
    }
}