insert update delete using store procedure and three tier architecture

create procedure proapmc3
as
select * from apmc2

public class BEL
{

    public string ID { get; set; }
    public string Name { get; set;}
    public decimal Salary { get; set; }
    public DateTime Date_In { get; set; }
}

public object displygird(BEL oob)
{
    DLL ob = new DLL();
    return ob.bindgrid(oob);
}

public object bindgrid(BEL obj)
{
    SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=master;Integrated Security=True");
    con.Open();
    SqlCommand cmd = new SqlCommand("proapmc3", con);
    cmd.CommandType = CommandType.StoredProcedure;
    SqlDataAdapter da = new SqlDataAdapter(cmd);
    cmd.Parameters.Add(new SqlParameter("@id", SqlDbType.VarChar, 22));
    cmd.Parameters["@id"].Value = obj.ID;

    cmd.Parameters.Add(new SqlParameter("@Name", SqlDbType.VarChar, 44));
    cmd.Parameters["@Name"].Value = obj.Name;

    cmd.Parameters.Add(new SqlParameter("@Salary", SqlDbType.Decimal, 7));
    cmd.Parameters["@Salary"].Value = obj.Salary;

    cmd.Parameters.Add(new SqlParameter("@Date_in", SqlDbType.DateTime, 27));
    cmd.Parameters["@Date_in"].Value = obj.Date_In;

    DataSet ds = new DataSet();
    BLL ob = new BLL();

    da.Fill(ds);
    return ds;
}

public void displygrid()
{
    BEL ojbelb = new BEL();
    BLL ob = new BLL();
    GridView1.DataSource = ob.displygird(ojbelb);
    GridView1.DataBind();
}