How to download pdf file from server not on database only on server - Simplest way

//only two lines code is required that is uncommented

//Response.Clear(); // This is i am not using because response.clear is used for clearing http response (like text) but this is a file that is presently on server. Also when we create pdf of text file than we use clear function and we are getting pdf file from database (binary fromat) Response.buffer is default true so we don't need.

 Response.AddHeader("content-disposition", "attachment; filename=t.pdf"); 

 //Response.ContentType = System.Net.Mime.MediaTypeNames.Application.Pdf; 

        //"application/octet-stream"; 

        Response.WriteFile(Server.MapPath("~/App_Data/Annexure.pdf")); // File must be there on server otherwise it will give error

//Response.end is also we are not using because we are not creating pdf file , if we create pdf file or we are getting from database than we use Response.End and Response.Clear() functions.

Response.WriteFile or Response.TransmitFile use in asp.net c# - how to view pdf or text file in web browser

 It is used to show the content of any file in web browser.  This  is same as response.write but it will write the content of the file to web page. Mainly it is used to view the file content not to download the file.  Both Response.WriteFile or Response.TransmitFile  are same

example if text file than use code below

For PDF file

Response.ContentType = System.Net.Mime.MediaTypeNames.Application.Pdf;

Response.WriteFile(Server.MapPath("~/App_Data/Annexure.pdf"));

For txt file

Response.Clear(); 

     

        Response.ContentType = System.Net.Mime.MediaTypeNames.Text.Plain;  and use Text.html

        //"application/octet-stream"; 

        Response.WriteFile(Server.MapPath("~/App_Data/yash.txt"));

        Response.End(); 

or on page load, simply we can show the content of text file

Response.WriteFile("~/App_Data/" + fileName);

Website admin tool - access rules for files and folders

Access rules are store in web.config for each folder

example like below:-

<?xml version="1.0" encoding="utf-8"?>

<configuration>

    <system.web>

        <authorization>

            <allow roles="Administrator" />

          <deny users="*" />

        </authorization>

    </system.web>

</configuration>

How to download the file using handler in asp.net c# of any format or extension - using anchor tag

  public void ProcessRequest(HttpContext context)

  {

    if (context.User.Identity.IsAuthenticated)

    {

      string filename = context.Request.QueryString["File"];

      //Validate the file name and make sure it is one that the user may access

      context.Response.Buffer = true;

      context.Response.Clear();

      context.Response.AddHeader("content-disposition", "attachment; filename=" + filename);

      context.Response.ContentType = "application/octet-stream";

//File(HelloWorld.txt) should be present on server in App_Data folder , otherwise it will show error

      context.Response.WriteFile("~/App_Data/" + filename);

    }

  }

aspx page

<a href="MyFileHandler.ashx?File=HelloWorld.txt">Click Here to Get File</a>

or 

 string fileName = context.Request.Params["File"];

 context.Response.ContentType = System.Net.Mime.MediaTypeNames.Application.Pdf; //"application/pdf"

//File(HelloWorld.txt) should be present on server in App_Data folder , otherwise it will show error

 context.Response.WriteFile("~/App_Data/" + fileName);

How to download the file using transmitfile function in asp.net c#

 Response.ContentType = "application/pdf";

Response.AppendHeader("Content-Disposition", "attachment; filename=MyFile.pdf");

//MyFile.pdf should be present in Files folder on server. other wise it will show error file not found.

Response.TransmitFile(Server.MapPath("~/Files/MyFile.pdf"));

Response.End();

reference:-https://www.c-sharpcorner.com/UploadFile/afenster/how-to-download-a-file-in-Asp-Net/