Answer Posted / vikas kant

HTTP handlers are the .NET components that implement the
System.Web.IHttpHandler interface, they can act as a target
for the incoming HTTP requests and can be called directly
by using their file name in the URL.
HTTP handlers implement the following two methods:
1) ProcessRequest: called to process http requests and
2) IsReusable which indicates whether this instance of http
handler can be reused for fulfilling another requests of
the same type.

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