How to download file via jQuery ajax and C#

well i have done it using iframe

this is the modified ajax function call

 function GenerateExcel() {
            var ResultTable = jQuery('<div/>').append(jQuery('<table/>').append($('.hDivBox').find('thead').clone()).append($('.bDiv').find('tbody').clone()));
            var list = [$(ResultTable).html()];
            var jsonText = JSON.stringify({ list: list });
            $.ajax({
                type: "POST",
                url: "GenerateMatrix.aspx/GenerateExcel",
                data: jsonText,
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function (response) {
                    if (isNaN(response.d) == false) {
                        $('#iframe').attr('src', 'GenerateMatrix.aspx?ExcelReportId=' + response.d);
                        $('#iframe').load();
                    }
                    else {
                        alert(response.d);
                    }
                },
                failure: function (response) {
                    alert(response.d);
                }
            });
        }

and this is the design part

 <iframe id="iframe" style="display:none;"></iframe>

on Page load my code looks like this

 Response.AppendHeader("content-disposition", "attachment;filename=FileEName.xls");
 Response.Charset = "";
 Response.Cache.SetCacheability(HttpCacheability.NoCache);
 Response.ContentType = "application/vnd.ms-excel";
 Response.Write(tableHtml);
 Response.End();

1. Add these in your view page-

   <iframe id="iframe" style="display:none;"></iframe>
   <button id="download_file">Download</button>
   

2. Server side

   public string Download(string file)        
   {
   
       string filePath = Server.MapPath(System.Configuration.ConfigurationManager.AppSettings["FileManagementPath"]);
   
   
       string actualFilePath = System.IO.Path.Combine(filePath, file);
       HttpContext.Response.ContentType = "APPLICATION/OCTET-STREAM";
       string filename = Path.GetFileName(actualFilePath);
       String Header = "Attachment; Filename=" + filename;
       HttpContext.Response.AppendHeader("Content-Disposition", Header);           
       HttpContext.Response.WriteFile(actualFilePath);
       HttpContext.Response.End();
       return "";
   }
   

3. Add this code in your JavaScript

   <script>
   
       $('#download_file').click(function(){
   
           var path = 'e-payment_format.pdf';//name of the file
           $("#iframe").attr("src", "/FileCabinet/Download?file=" + path);
   
       });
   
    </script>
   

That should work!