Passing text-box value from view to action method and return true false on given condition

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MVC4

ASP.NET4

I have a text box and a button. If I put "adm" in the text box and click on the button, the value will get passed to the controller to an action method. There it will check whether the given value in the text box is "adm" or not. If its "adm" then it will show "true" in an alert box and if its not "adm" then it will return "false" in an alert box. I am confused how to implement the whole thing. Please help. I have been told to use jquery for that by my faculty.