How to do postback after downloading File using Response.WriteFile method in Asp.Net

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C#

ASP.NET

I am using Response.WriteFile method for downloading an excel sheet from a desired location to client machine.Below is the code:-

// Checking if file exists
                if (myfile.Exists)
                {
                    // Clear the content of the response  
                    HttpContext.Current.Response.ClearContent();

                    // Add the file name and attachment, which will force the open/cancel/save dialog box to show, to the header
                    HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + myfile.Name);

                    // Add the file size into the response header
                    HttpContext.Current.Response.AddHeader("Content-Length", myfile.Length.ToString());

                    // Set the ContentType
                    HttpContext.Current.Response.ContentType = ReturnExtension(myfile.Extension.ToLower());

                    // Write the file into the response (TransmitFile is for ASP.NET 2.0. In ASP.NET 1.1 you have to use WriteFile instead)
                    HttpContext.Current.Response.WriteFile(myfile.FullName);

                    // End the response
                    HttpContext.Current.Response.End();
                }
private string ReturnExtension(string fileExtension)
        {
            switch (fileExtension)
            {
                case ".xlsx":
                    return "application/excel";
                default:
                    return "application/octet-stream";
            }
        }

I want that once the download pop up will appear and asking for Save/Open/Cancel and the end user select his option then after completion of that task a post back happen to the webpage from where it is been invoked. Suppose if user click save then the file get saved and after saving a post back will happen.Same if user select open then the file will be opened and then a post back happen to the webpage from where this Download function is invoked.