Question

Html.BeginForm("LogOn", "Home", FormMethod.Post)

LogOn – Action.

Home – Controller.

So It will create the Url like = Home/LogOn .

But If I have action LogOn(String s ) , LogOn(int i) inside the controller Home and both are HttpPost ,
Then which one action raise at that time . means right now it is giving exception :

"ambiguous between the

following action methods"

Answer 1

You cannot have 2 actions with the same name inside the same controller. The only way for this to work is to make one of the 2 actions accessible only with [HttpPost]:

public ActionResult LogOn(int i)
{
    ...
}

[HttpPost]
public ActionResult LogOn(string s)
{
    ...
}

Now when you submit the form it will invoke the second action. And when you type /home/logon in your browser address bar (using GET verb) it will execute the first action to probably render the LogOn form.