protected void Button2_Click(object sender, EventArgs e) { this.lblMessage.Text = ""; string mId = string.Empty; for (int i = 0; i <= gvUserList.Rows.Count - 1; i++) { CheckBox cb1 = (CheckBox)gvUserList.Rows[i].FindControl("cb1"); if (cb1.Checked) { mId = mId + gvUserList.DataKeys[i].Value + ","; } } mId = mId.Substring(0, mId.Length - 1); Business.UserComponent uc = new UserComponent(); uc.DeleteUser(mId); getUsers(); }