#Routing Constraint

Route Constraint : Restrict browser request that matches route value based on constraints.

name: "Default",
url: "{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional },
constraints : new {id = @"\d"} // Constraint

The above constraint allows only integer to be passed,if a string is passed you
would get “No Resource Found“.If constraint is not handled,the page would have
throwed exception saying String could not be converted to string.thus constraint
also helps to hide sensitive information to client.

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