Gridview导出excel（简单实现）

protected void excel_Click(object sender, EventArgs e)
{
            export("application/ms-excel", "导出.xls");

}
public void export(string fileType, string fileName)
{
        Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8).ToString());
        Response.ContentType = fileType;
        //解决乱码问题
        Response.Charset = "GB2312"; 
        Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312"); 

        this.EnableViewState = false;
        StringWriter tw = new StringWriter();
        HtmlTextWriter hw = new HtmlTextWriter(tw);
        this.SmartGridView1.RenderControl(hw);
        //解决单元格数据类型不同的显示问题
        string style = @"<style> .td { mso-number-format:\@; } </style> ";
        Response.Write(style);
        Response.Write(tw.ToString());
        Response.End();
}
//必须列出该方法
public override void VerifyRenderingInServerForm(Control control)
{
}