.net按格式导出到.txt文件

示例图片：


完整示例代码如下：SqlConnection con = DB.mysqlconnection();
        SqlDataAdapter da = new SqlDataAdapter("SQL语句");
        DataSet ds = new DataSet();
        da.Fill(ds);
        System.Text.StringBuilder sb = new System.Text.StringBuilder();
        if (ds.Tables[0].Rows.Count > 0)
        {
            int i = 0;
            for (int n = 0; n < ds.Tables[0].Rows.Count; n++)
            {
                for (int m = 0; m < ds.Tables[0].Columns.Count; m++)
                {
                    i++;
                    sb.Append(ds.Tables[0].Rows[n][m].ToString());
                    if (i % 11 != 0)
                    {
                        sb.Append(",");
                    }
                    else
                    { break; }
                }
                sb.Append("\r\n");
            }
            Page.Response.Clear();
            Page.Response.Buffer = true;
            Page.Response.Charset = "GB2312";
            Page.Response.AppendHeader("Content-Disposition", "attachment;filename=abc.txt");
            Page.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");//设置输出流为简体中文
            Response.ContentType = "text/plain";//设置输出文件类型为txt文件。  
            this.EnableViewState = false;
            System.Globalization.CultureInfo myCItrad = new System.Globalization.CultureInfo("ZH-CN", true);
            System.IO.StringWriter oStringWriter = new System.IO.StringWriter(myCItrad);
            Page.Response.Write(sb.ToString());
            Page.Response.End();
        }
        con.Close();