在Asp.net中将GridView打印为word或者Excel

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protected void Button_print_Click(object sender, EventArgs e)
{
System.Web.HttpContext HC = System.Web.HttpContext.Current;
HC.Response.Clear();
HC.Response.Charset = "GB2312";
HC.Response.Buffer = true;
HC.Response.ContentEncoding = System.Text.Encoding.UTF7;
HC.Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode("查询结果打印", System.Text.Encoding.UTF8) + ".doc");
HC.Response.ContentType = "application/ms-word";//如果要打印为excel格式，则换为"application/excel"
this.EnableViewState = false;
System.IO.StringWriter sw = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter htw = new System.Web.UI.HtmlTextWriter(sw);
this.GV_result.RenderControl(htw);
HC.Response.Write(sw.ToString());
HC.Response.End();
}//打印输出按钮

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public override void VerifyRenderingInServerForm(System.Web.UI.Control control)
{
}

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EnableEventValidation="false"