在页面添加一个ID为ExportToExcelBtn的按钮，代码部分如下：
protected void ExportToExcelBtn_Click(object sender, EventArgs e)
{
Response.Clear();
Response.AddHeader("content-disposition", "attachment;filename=lessons.xls");
Response.Charset = "gb2312";
Response.ContentType = "application/vnd.xls";
System.IO.StringWriter stringWrite = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
gvLessons.AllowPaging = false;
gvLessons.DataBind();
gvLessons.RenderControl(htmlWrite);
Response.Write(stringWrite.ToString());
Response.End();
gvLessons.AllowPaging = true;
gvLessons.DataBind();
}
要重载VerifyRenderingInServerForm方法，不然将报错！
public override void VerifyRenderingInServerForm(Control control) { }