public void makeHtml1(string flname, string fname, string ftext)
    {
        //string _FileDir = HttpContext.Current.Server.MapPath(Path.GetDirectoryName(fname));
        string _FileDir = @"d:\"+flname+@"\";
        //创建文件夹
        if (!Directory.Exists(@_FileDir))
        {
            Directory.CreateDirectory(@_FileDir);
        }
        Encoding code = Encoding.GetEncoding("Gb2312");
        //创建文件
        string phyPath = _FileDir + fname;
      
        string OldString = "";
        OldString = OldString + ftext;
        System.IO.StreamWriter sw = new System.IO.StreamWriter(phyPath, false, code);
        sw.Write(ftext);
        sw.Flush();
        sw.Close();
        sw.Dispose();
        HttpContext.Current.Response.Write("成功生成：" + fname);
    }

protected void Button1_Click(object sender, EventArgs e)
    {
        string fl = this.TextBox3.Text;//文件夹
        string aa = this.TextBox1.Text;//文件
        string ss = aa + ".html";
        string content = this.TextBox2.Text;//内容

        makeHtml1(fl, ss, content);

}