asp.net GridView 事件操作

    protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)    {        if (e.CommandName == "a")        {            int index = Convert.ToInt16(e.CommandArgument);            GridViewRow selectedRow = GridView1.Rows[index];            TableCell cellvalue = selectedRow.Cells[1];            string value = cellvalue.Text;        }    }    protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)    {        GridViewRow selectedRow = GridView1.SelectedRow;        TableCell cellvalue = selectedRow.Cells[1];        string value = cellvalue.Text;    }