public override async Task GrantResourceOwnerCredentials(OAuthGrantResourceOwnerCredentialsContext context)
        {
           
            context.OwinContext.Response.Headers.Add("Access-Control-Allow-Origin", new[] { "*" });

            UserService _user = new UserService();
                User user = _user.CheckUser(new UserAuthModel {UserName = context.UserName,Password = context.Password});
                if (user == null)
                {
                    context.SetError("invalid_grant", "The user name or password is incorrect.");
                    return;
                }  

            var identity = new ClaimsIdentity(context.Options.AuthenticationType);
            identity.AddClaim(new Claim("sub", context.UserName));
            identity.AddClaim(new Claim("role", "user"));

            context.Validated(identity);

        }
 public accountUniTest()
 {
     System.Data.Entity.Database.SetInitializer<MyDbContext>(new DropCreateDatabaseIfModelChanges<MyDbContext>());
     _UserService = new UserService();
 }
 public AccountController()
 {
     _UserService = new UserService();
 }