CurrentCell.RowNumber抱错!

Question

        private void dgrd_Popedom_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            DataTable popedomDataTable = new DataTable();
            DataRow myRow = dt.Rows[0];
            int intRowNumber = this.dgrd_Popedom.CurrentCell.RowNumber; //“System.Windows.Forms.DataGridViewCell”并不包含“RowNumber”的定义    为什么回有这样的抱错呢?        
            string tempStrSQL = "select 权限名称 from 权限清单 " + " where 用户编号 = '" + myRow[intRowNumber].ToString().Trim() + "'";
            popedomDataTable = link.relateData(tempStrSQL);
            for (int i = 0; i < popedomDataTable.Rows.Count; i++)//根据权限设置ListBox
            {
                for (int j = 0; j < this.chkLst_Priority.Items.Count; j++)
                {
                    if (this.chkLst_Priority.Items[j].ToString().Trim() == popedomDataTable.Rows[i][0].ToString().Trim())
                    {
                        this.chkLst_Priority.SetItemChecked(j, true);
                    }
                }
            }