Datagrid乱码

我在用下面代码将gridview导出到excel中时，其中的汉字出现了乱码： protected void Button2_Click(object sender, EventArgs e)     {         GridView1.Focus();         Response.Clear();         Response.Buffer = false;         Response.Charset = "GB2312";         Response.AppendHeader("Content-Disposition", "attachment;filename=pickmorv.xls");         Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");         Response.ContentType = "application/ms-excel";         this.EnableViewState = false;         System.IO.StringWriter oStringWriter = new System.IO.StringWriter();         HtmlTextWriter oHtmlTextWriter = new HtmlTextWriter(oStringWriter);         GridView1.RenderControl(oHtmlTextWriter);         Response.Write(oStringWriter.ToString());         Response.End();     }     public override void VerifyRenderingInServerForm(Control control)     {         //base.VerifyRenderingInServerForm(control);     } 使用下列代码时解决了问题： #region   //将某天的详细数据导出到EXCEL     protected void Button3_Click(object sender, EventArgs e)     {         Response.Clear();         Response.Buffer = false;         Response.Charset = "GB2312";         Response.AppendHeader("Content-Disposition", "attachment;filename=pkmv_de.xls");         Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");         Response.ContentType = "application/ms-excel";         Response.Write("");         this.EnableViewState = false;         System.IO.StringWriter oStringWriter = new System.IO.StringWriter();         HtmlTextWriter oHtmlTextWriter = new HtmlTextWriter(oStringWriter);         GridView2.RenderControl(oHtmlTextWriter);         Response.Write(oStringWriter.ToString());         Response.End();     }  public override void VerifyRenderingInServerForm(Control control)     {         //base.VerifyRenderingInServerForm(control);     }     #endregion