private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)

Question

 private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            MessageBox.Show("hello");
            strID = dataGridView1.Rows[e.RowIndex].Cells[3].Value.ToString();
            XElement xe = XElement.Load(strPath );
            IEnumerable<XElement> elements = from PInfo in xe.Elements("Table")
                                             where PInfo.Element("XH").Value == strID
                                             select PInfo;
            foreach (XElement element in elements)
            {
                stuName.Text = element.Element("XM").Value ;
                stuSEX.SelectedItem = element.Element("XB").Value;
                stuID.Text = element.Element("XH").Value ;
                stuZy.Text = element.Element("ZY").Value;
                stuZxf.Text = element.Element("ZXF").Value;

            }
            this.Refresh();
        }

添加了这个事件后但单击单元格没反应