Help me on this Gridview Page

{
    LookUp _objLook = new LookUp();
    DataSet ds = new DataSet();
    ValidateUser _objLogin = new ValidateUser();
    protected void Page_Load(object sender, EventArgs e)
    {
        ////// int userID = Convert.ToInt32(Request.QueryString["UserId"]);
        int uID = Convert.ToInt32(Session["userid"].ToString());
        if (!IsPostBack)
        {
            BindGrid();
        }
    }
    public void BindGrid()
    {
        int uID = Convert.ToInt32(Session["userid"]);
        int x = uID;
        ds = _objLook.Displayaccountdetails(uID);
       GridView1.DataSource = ds;
       GridView1.DataBind();

    }
    protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        GridView1.EditIndex = e.NewEditIndex;
        BindGrid();
    }
    protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        e.Cancel = true;
        GridView1.EditIndex = -1;
        BindGrid();

    }
    protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        TextBox txtEmail = (TextBox)(GridView1.Rows[GridView1.EditIndex].FindControl("txtEmail"));
        TextBox txtMobileNumber = (TextBox)(GridView1.Rows[GridView1.EditIndex].FindControl("txtMobileNumber"));
        _objLogin.UserId = int.Parse(GridView1.DataKeys[e.RowIndex].Value.ToString());
        _objLogin.Email = txtEmail.Text;
        _objLogin.MobileNumber = txtMobileNumber.Text;
        int i = _objLook.update(_objLogin);
        if (i > 0)
        {
            Response.Redirect("Updated Successfully");
        }
        else
        {
            Response.Redirect("Updated Failed");
        }       
    
        GridView1.EditIndex = -1;
        BindGrid();
      
    }
}