c# - Change Error response in web API -

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i'm using token based authentication in web api application. in login request, if user enter wrong credentials, return response error in format.

in grantresourceownercredentials method 

if (user == null)     {       context.seterror("the email or password incorrect.");       return;     }

which return response as

 {       "error": "invalidlogin",       "error_description": "the email or password incorrect."     }

and in application error response returned in format

{   "message": "some internal server error occurred." }

so how can change error response of web api 

    {       "message": "the email or password incorrect."     }

edited : try this

string jsonstring = "{\"message\": \"the email or password incorrect.\"}"; context.seterror(new string(' ',jsonstring.length-12));  context.response.statuscode = 400; context.response.write(jsonstring);

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