ASP.NET中获取GridView中的控件

获取GirdView中的控件：   

//单选
    protected void chkDelete_CheckedChanged(object sender, EventArgs e)
    {
        CheckBox chkAll = this.gvHotCheck.HeaderRow.Cells[0].FindControl("chkAll") as CheckBox;
        chkAll.Checked = false;
    }