Code for Downloading a file in asp.net and C#

Code for Downloading a file in asp.net and C#

 If you want to download a file which is in your project folder.
step 1: Create a new web page and Name it as DownloadFile.aspx
step 2 : Add this below code in Code behind file (.cs ) file

#region Namespace
using System;
using System.IO;
#endregion

#region Description , Methods and Functions
///

///
/// Summary description for DownloadFile.aspx
///
/// ************************************************************
/// *    Project Name       :   Pricing Point (Wells Fargo)    *
/// *    Created on         :   Monday, June 28 2010           *
/// *    Page Name          :   DownloadFile.aspx              *
/// *    Procedure name     :   sp_DashboardDetails            *
/// *    Front end          :   Visual Studio 2010             *
/// *    Back end           :   Sql server 2008                *
/// *    Framework version  :   4.0                            *
/// ************************************************************
///
///

///

public partial class DownloadFile : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Request.QueryString.Get("Id") != null)
        {
            string strRequest = Request.QueryString.Get("Id");
            //-- if something was passed to the file querystring
            //get absolute path of the file
            if (!string.IsNullOrEmpty(strRequest))
            {
                string path = Server.MapPath(strRequest);
                //get file object as FileInfo
                System.IO.FileInfo file = new System.IO.FileInfo(path);
                //-- if the file exists on the server
                //set appropriate headers
                if (file.Exists)
                {
                    Response.Clear();
                    Response.AddHeader("Content-Disposition", "attachment; filename=" + file.Name);
                    Response.AddHeader("Content-Length", file.Length.ToString());
                    Response.ContentType = "application/octet-stream";
                    Response.WriteFile(file.FullName);
                    Response.End();
                    //if file does not exist
                }
                else
                {
                    Response.Write("This file does not exist.");
                }
                //nothing in the URL as HTTP GET
            }
            else
            {
                Response.Write("Please provide a file to download.");
            }
        }
    }
 
}
#endregion

step 3: Call this function in where you have requirement for downloading file

Pass file Name to this function

 Response.Redirect("~/DownloadFile.aspx?Id=" + filename);