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>
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>
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/
Http handlers are used for
Binary files
Dynamic image views
Performance-critical web pages
XML files
Minimal web pages
and these are fast and it only gives minimum response. example when you write
Response.ContentType = "text/plain";
//MediaTypeNames.Text.Plain
in aspx page it will give lot of information.
and when you write this in handler it will give only specific information that you want.
Also no return type of processrequest funtion in http handler
you can create other return type function in handler and also create model in handler.
Computer is having data and english hindi lanuguage all time. and text is very small
but in television we have visual things , and text is very large if it had
