ASP.NET

In ASP.Net, I sometimes get the following error – Viewstate verification failed. Reason: The viewstate supplied failed integrity check

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Background: I developed a web app in ASP.Net 3.5 in C#. It runs great but now a few users have reported that they recieve an error sometimes. I have tried to duplicate the error but it has been hard. One time though when I let the app sit I came back later and tried to move it along and it errored out. I would think that has something to do with the timeout but I am using the view state.

How to detect which button was clicked in code behind?

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I have three buttons each calling btn_Clicked on their onClick event. In code behind I want to get the ID of the button that caused postback. I know I can assign each button to call a different method but I would like to learn a bit of ASP.Net. Also tell me which method is more efficient? Calling different methods on different button clicks or calling the same method (if the functionality of each button is same).

ASP.NET OAuth Authorization – Difference between using ClientId and Secret and Username and Password

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I’m trying to implement a simple OAuthAuthorizationServerProvider in ASP.NET WebAPI 2. My main purpose is to learn how to have a token for a mobile app. I would like users to login with username & password, and then receive a token (and a refresh token so they won’t have to re-enter credentials once token expires). Later on, I would like to have the chance to open the API for external use by other applications (like one uses Facebook api and such…).