If you are requesting particular data or file or function(Like MVC Function) or directory or resource. then server trying to find that particular resource if resource found successfully then you get HTTP 200 but if that resource not found on server, then an error send back by the server that is HTTP 404.Server only sends 404 flag. It is a Client-side Error which means that either the page has been removed or moved and the URL was not changed accordingly, or that you typed in the URL incorrectly.

When You are searching for any URL , if the URL get found thr HTTP 200 IS OK , that it isn't shown in the page and the URL directly get opened, but when any URL didn't get found the 404 Error will be appeared.

If the Requested Resource Not Found on the path you are surfing then it generates 404 Error, 404 is the HTTP Status Response Code which tell you in detail the error, you can resolve it by following stack trace or by iis logging mechanism in which you can find the details of referral page from which it redirect to the main resource of error.for more detail refer to the article http://www.c-sharpcorner.com/UploadFile/70dbe6/introdcution-to-http-status-response-codes/

It means the webpage you were trying to reach on a website couldn't be found on the server.You can solve this by following the below steps/points:-->Refresh the page-You can press Ctrl+F5 to force a refresh on the page. The error may appear just because the page wouldn't load.->Clear browser's cache and cookies -If you are able to visit the page from another device, such as your phone, clearing the cache and cookies will usually solve the problem.->Check the URL-Make sure that the URL input-ed correctly. This includes spelling of the URL, correct slashes, file extension of the page and so forth.->Scan for Malware-There are some malware files that will force a 404 Error on websites. It's imperative to make sure your computer is clean and not compromised.->Contact the Webmaster -Go ahead and send a message to the webmaster and let them know of the 404 error. If you are the website owner then contact your hosting provider for more information. If the server is encountering problems, it may return 404 errors.

404 Error code shows that client request for a resource (eg webpage or file) and http server not responded because resource (eg webpage or file) not found that location.

404 Error code shows that client request for a resource (eg webpage or file) and http server not responded because resource (eg webpage or file) not found that location.

if you are trying to access a file that is not present in that specified path 404 Error will comeThanks

The HTTP 404 Not Found Error means that the webpage you were trying to open could not be found on the server. It is a Client-side error which means that either the page has been moved and the URL was not changed accordingly.

you can refer article http://www.c-sharpcorner.com/UploadFile/a8024d/http-message-format-in-Asp-Net-5/

If the source file is not found from the path, it provides the 404 error.

Can you Explain in detail about, how to send confirmation Email Regarding Registration/Forgot Password, By using SMTP?

This error comes because if you are trying to access a file that is not present in that specified path.

File Not Found Error

if your requested webpage is not found in server it will be a 404(not found) error dnt wory most of the the time it will be solved after refreshment of server

The web site hosting server will typically generate a "404 Not Found" web page when a user attempts to follow a broken or dead link; hence the 404 error is one of the most recognizable errors users can find on the web.

webpage is not there on the configured database or application .

The HTTP 404 Not Found Error means that the webpage you were trying to reach could not be found on the server.

The HTTP 404 Not Found Error means that the webpage you were trying to reach could not be found on the server. It is a Client-side Error which means that either the page has been removed or moved and the URL was not changed accordingly, or that you typed in the URL incorrectly.

File Not Found Error

https://support.microsoft.com/en-us/kb/315122