public static void ExportExcel(GridView gridview,string filename,DataBindGridView databindgridview)
    {
        HttpContext.Current.Response.Clear();
        HttpContext.Current.Response.Buffer = true;
        HttpContext.Current.Response.Charset = "GB2312";
        HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + filename + ".xls");
        //System.Text.Encoding.GetEncoding("GB2312")
        //HttpContext.Current.Response.AppendHeader("content-disposition", "attachment;filename=\"" + System.Web.HttpUtility.UrlEncode(filename, System.Text.Encoding.UTF8) + ".xls\"");
        // 如果设置为 GetEncoding("GB2312");导出的文件将会出现乱码！！！
        HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8"); //System.Text.Encoding.GetEncoding("GB2312");//System.Text.Encoding.UTF8;
        HttpContext.Current.Response.ContentType = "application/ms-excel";//设置输出文件类型为excel文件。 
        //System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
        gridview.EnableViewState = false;
        //this.EnableViewState = false;
        System.Globalization.CultureInfo myCItrad = new System.Globalization.CultureInfo("ZH-CN", true);//：中国
        System.IO.StringWriter oStringWriter = new System.IO.StringWriter(myCItrad);
        System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);
        databindgridview();
        gridview.RenderControl(oHtmlTextWriter);
        HttpContext.Current.Response.Output.Write(oStringWriter.ToString());
        HttpContext.Current.Response.Flush();
        HttpContext.Current.Response.End();
    }

 //System.Text.Encoding.GetEncoding("GB2312")
        //HttpContext.Current.Response.AppendHeader("content-disposition", "attachment;filename=\"" + System.Web.HttpUtility.UrlEncode(filename, System.Text.Encoding.UTF8) + ".xls\"");
        // 如果设置为 GetEncoding("GB2312");导出的文件将会出现乱码！！！

------解决方案--------------------
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引用:

C# code
//System.Text.Encoding.GetEncoding("GB2312")
//HttpContext.Current.Response.AppendHeader("content-disposition", "attachment;filename=\"" + System.Web.HttpUtility.UrlEncode(f……


------解决方案--------------------
我这里有多种解决方案，你可以选择自己合适的方法。代码如下：
1、由dataset生成

以下为引用的内容：
public void CreateExcel(DataSet ds,string typeid,string FileName)

  {

  HttpResponse resp;

  resp = Page.Response;

  resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");