Asp.net导出Excel乱码

Response.Charset = "UTF-8";//添加编码格式 
Response.ClearContent(); 
Response.Clear(); 
Response.ContentEncoding = System.Text.Encoding.UTF8;//表格内容添加编码格式 
Response.HeaderEncoding = System.Text.Encoding.UTF8;//表头添加编码格式 

		

protected void Excel_Click(object sender, EventArgs e) 
...{ 
  Response.Charset = "UTF-8"; 
  Response.ClearContent(); 
  Response.Clear(); 
  Response.ContentEncoding = System.Text.Encoding.UTF8; 
  Response.HeaderEncoding = System.Text.Encoding.UTF8; 
  Response.AddHeader("content-disposition", "attachment; filename=MyExpress。xls"); 
  Response.ContentType = "application/excel"; 
  System.IO.StringWriter sw = new System.IO.StringWriter(); 
  HtmlTextWriter htw = new HtmlTextWriter(sw); 

  // turn off paging 
  GridView1.AllowPaging = false; 
  dataBind(); 
  GridView1.RenderControl(htw); 
  Response.Write(sw.ToString()); 
  Response.End(); 

  // turn the paging on again 
  GridView1.AllowPaging = true; 
  dataBind(); 
} 

		

Response.ClearContent(); 
Response.Clear(); 
Response.AddHeader("content-disposition", "attachment; filename=sumlate。xls"); 

Response.Charset = "GB2312"; 
Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312"); 
Response.ContentType = "application/excel"; 
System.IO.StringWriter sw = new System.IO.StringWriter(); 

HtmlTextWriter htw = new HtmlTextWriter(sw); 
if (GridView2.Rows.Count > 0) 
...{ 
  GridView2.RenderControl(htw); 
} 
else 
...{ 
  GridView1.RenderControl(htw); 
} 
Response.Write(sw.ToString()); 
Response.End(); 

		

        /**//// <summary> 
        /// 把DataTable内容导出excel并返回客户端 
        /// </summary> 
        /// <param name="dgData">待导出的DataTable</param> 
        
        public static void DataTable2Excel(System.Data.DataTable dtData)
        ...{
            System.Web.UI.WebControls.DataGrid dgExport = null;
            // 当前对话 
              System.Web.HttpContext curContext = System.Web.HttpContext.Current;
            // IO用于导出并返回excel文件 
              System.IO.StringWriter strWriter = null;
            System.Web.UI.HtmlTextWriter htmlWriter = null;

            if (dtData != null)
            ...{
                // 设置编码和附件格式 
                  curContext.Response.ContentType = "application/vnd.ms-excel";
                curContext.Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
                curContext.Response.Charset = "gb2312";

                // 导出excel文件 
                  strWriter = new System.IO.StringWriter();
                htmlWriter = new System.Web.UI.HtmlTextWriter(strWriter);

                // 为了解决dgData中可能进行了分页的情况，需要重新定义一个无分页的DataGrid 
                dgExport = new System.Web.UI.WebControls.DataGrid();
                dgExport.DataSource = dtData.DefaultView;
                dgExport.AllowPaging = false;
                dgExport.DataBind();

                // 返回客户端 
                  dgExport.RenderControl(htmlWriter);
                curContext.Response.Clear();
                curContext.Response.Write("<meta http-equiv=\\"content-type\\" content=\\"application/ms-excel; charset=gb2312\\"/>" + strWriter.ToString());
                curContext.Response.End();
            }
        }