context.SetError("invalid_credentials", Newtonsoft.Json.JsonConvert.SerializeObject(new { result = false, message = "Please enter password !!!" }));
                }
            });
        }
        else
        {
            return Task.Factory.StartNew(() =>
            {
                var username = _userName;
                var password = _passWord;
                var userService = new UserServices();
                User user = userService.GetUserByCredentials(username, password);
                if (user != null && user.IsValid)
                {
                    var claims = new List<Claim>()
                    {
                    new Claim(ClaimTypes.Name, user.Name),
                    new Claim("UserID", user.Id)
                    };

                    ClaimsIdentity oAutIdentity = new ClaimsIdentity(claims,
                        Axmix.App_Start.Startup.OAuthOptions.AuthenticationType);
                    context.Validated(new AuthenticationTicket(oAutIdentity, new AuthenticationProperties() { }));
                }
                else
                {
                    context.SetError("invalid_grant", Newtonsoft.Json.JsonConvert.SerializeObject(new { result = false, message = "Invalid User Credentials !!!" }));
                }
            });
        }
    }


public override Task ValidateClientAuthentication(OAuthValidateClientAuthenticationContext context)
    {
        string clientId = string.Empty;
        string clientSecret = string.Empty;

        if (!context.TryGetFormCredentials(out clientId, out clientSecret))
        {
            context.SetError("invalid_client", "Client credentials could not be retrieved through the Authorization header.");
            context.Rejected();

        }


        if (!string.IsNullOrEmpty(clientId) && !string.IsNullOrEmpty(clientSecret))
        {
            context.Validated();
            _userName = clientId;
            _passWord = clientSecret;
        }
        else
        {
            context.Rejected();
        }
        //return Task.FromResult<object>(null);
        return base.ValidateClientAuthentication(context);
    }