LINQ INSERT UPDATE DELETE IN GRIDVIEW

public class Empp

{

    public int ID{get;set;}

    public string UserName{get;set;}

    public string Pass { get; set; }

    public string Gender { get; set; }

    public string Email { get; set; }

}

public List<Empp> Filldata()

    {

        DataClassesDataContext obj = new DataClassesDataContext();

        var s = from a in obj.Employees

                select new Empp

                { 

                      UserName=a.UserName,

                       Gender=a.Gender,

                        Pass=a.Pass,

                         ID=a.ID,

                         Email=a.Email

                                             

                };

        return s.ToList();

  

    }

public void k()

    {

        GridView1.DataSource = Filldata();

        GridView1.DataBind(); 

    }

protected void Btn_Save_Click(object sender, EventArgs e)

    {

        DataClassesDataContext obj = new DataClassesDataContext();

        if (Btn_Save.Text == "Save")

        {

            Employee tblem = new Employee();

            int Id = 0;

            if (tblem.ID == 0)

            {

                tblem.UserName = txt_User.Text;

                tblem.Pass = txt_Pwd.Text;

                tblem.Email = txt_Email.Text;

                tblem.Gender = DDL_Gender.SelectedItem.Text;

                obj.Employees.InsertOnSubmit(tblem);

                obj.SubmitChanges();

                k();

            }

        }

        else

        {

            DataClassesDataContext obj1 = new DataClassesDataContext();

            int Empid=Convert.ToInt32(Session["ID"]);

            Employee tblemp = new Employee();

            tblemp= obj1.Employees.Where(s => s.ID == Empid).FirstOrDefault();

             if (tblemp != null)

            {

                tblemp.UserName = txt_User.Text;

                tblemp.Pass = txt_Pwd.Text;

                tblemp.Email = txt_Email.Text;

                tblemp.Gender = DDL_Gender.SelectedItem.Text;

                obj1.SubmitChanges();

                k();

            }

        }

      

    }

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)

    {

        if (e.CommandName == "Edit")

        {

            int index = Convert.ToInt32(e.CommandArgument);

            Session["ID"] = GridView1.DataKeys[index].Value.ToString();

            txt_User.Text = GridView1.Rows[index].Cells[0].Text.Trim();

            txt_Pwd.Text = GridView1.Rows[index].Cells[1].Text.Trim();

            txt_Email.Text = GridView1.Rows[index].Cells[2].Text.Trim();

            DDL_Gender.SelectedItem.Text = GridView1.Rows[index].Cells[3].Text.Trim();

            Btn_Save.Text = "Update";

        }

        else if (e.CommandName == "Delete")

        {

            DataClassesDataContext obj = new DataClassesDataContext();

            int index = Convert.ToInt32(e.CommandArgument);

            Session["ID"] = GridView1.DataKeys[index].Value.ToString();

            int id = Convert.ToInt32(Session["ID"].ToString());

            Employee th = new Employee();

            var ss=(from a in obj.Employees.Where(s=>s.ID== id) select a).FirstOrDefault();

            obj.Employees.DeleteOnSubmit(ss);

            obj.SubmitChanges();

            k();

           

        }

    }

protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)

    {

    }

    protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)

    {

    }