When binding data, add the primary key value parameter to the button

 

Code

  protected void gvwCaseList_RowDataBound(object sender, GridViewRowEventArgs e)
        {
if (e.Row.RowType == DataControlRowType.DataRow)
            {           
                LinkButton  btnSelect = (LinkButton)e.Row.FindControl("lkbFor");
                btnSelect.CommandArgument = this.gvwCaseList.DataKeys[e.Row.RowIndex].Value.ToString();
                LinkButton btnEdit = (LinkButton)e.Row.FindControl("lkbEdit");
                btnEdit.CommandArgument = this.gvwCaseList.DataKeys[e.Row.RowIndex].Value.ToString();
                LinkButton btnDelete = (LinkButton)e.Row.FindControl("lkbDelete");
                btnDelete.CommandArgument = this.gvwCaseList.DataKeys[e.Row.RowIndex].Value.ToString();
                LinkButton btnSee = (LinkButton)e.Row.FindControl("lkbSee");
                btnSee.CommandArgument = this.gvwCaseList.DataKeys[e.Row.RowIndex].Value.ToString();
                btnSee.Attributes.Add("onclick", "javascript:window.open('case_detail.aspx?caseid=" + btnSee.CommandArgument + "','','scrollbars=yes,status=no,width=1200,height=470')");
if (UserInfo.UserType == "02")
                {
                    btnSelect.Visible = false;
                    btnEdit.Visible = false;
                    btnDelete.Visible = false;
                }
            }
        }