public override async Task GrantResourceOwnerCredentials(OAuthGrantResourceOwnerCredentialsContext context) { context.OwinContext.Response.Headers.Add("Access-Control-Allow-Origin", new[] { "*" }); UserViewModel usermodel; using (SchoolServiceContext _repo = new SchoolServiceContext()) { Users user = _repo.Users.Where(u => u.UserName == context.UserName && u.UserPassword == context.Password).FirstOrDefault(); if (user == null) { context.SetError("invalid_grant", "The user name or password is incorrect."); return; } usermodel = user; } var identity = new ClaimsIdentity(context.Options.AuthenticationType); identity.AddClaim(new Claim(ClaimTypes.Sid, Convert.ToString(usermodel.Id))); identity.AddClaim(new Claim(ClaimTypes.Name, usermodel.UserName)); context.Validated(identity); //context.Validated(new ClaimsIdentity(context.Options.AuthenticationType)); }