protected void Button1_Click(object sender, EventArgs e) { int productId = 0; GridView GridView1 = new GridView(); GridView1 = (GridView)Page.Master.FindControl("ContentPlaceHolder2").FindControl("GridView1"); if (GridView1 != null) { for (int i = 0; i < GridView1.Rows.Count; i++) { CheckBox CheckBox1 = new CheckBox(); CheckBox1 = (CheckBox)GridView1.Rows[i].FindControl("CheckBox1"); if (CheckBox1 != null) { if (CheckBox1.Checked) { productId = int.Parse(GridView1.Rows[i].Cells[1].Text); cartItemService.Delete(Convert.ToInt32(Session["CustomerId"]), productId); } } } } Bind(); }