bool type error using linq query

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C#

ASP.NET

LINQ

MVC

Dear all,

I am trying to integrate user class method into basic auth class and I am currently experiencing --'bool' does not contain a definition for 'username' and no extension method 'username' accepting a first argument of type 'bool' could be found (are you missing) -- error.

IPrincipal principal = new GenericPrincipal(new GenericIdentity(user.username, BasicAuthResponseHeaderValue), null);

basic auth class:

public BasicAuthHandler(iUser repository)
        {
            this.repository = repository;
        }

        [Inject]
        iUser repository { get; set; }


        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
        {
            AuthenticationHeaderValue authValue = request.Headers.Authorization;

            if (authValue == null || authValue.Scheme != BasicAuthResponseHeaderValue)
            {
                return Unauthorized(request);
            }

            string[] credentials = Encoding.ASCII.GetString(Convert.FromBase64String(authValue.Parameter)).Split(new[] { ':' });
            if (credentials.Length != 2 || string.IsNullOrEmpty(credentials[0]) || string.IsNullOrEmpty(credentials[1]))
            {
                //return Unauthorized(request);
                var resp = new HttpResponseMessage(HttpStatusCode.NotFound)
                {
                    Content = new StringContent(string.Format("access denied")),
                };
            }

        
            var user = repository.full(credentials[0], credentials[1]);
            if (user == null)
            {
                var resp = new HttpResponseMessage(HttpStatusCode.NotFound)
                {
                    Content = new StringContent(string.Format("access denied")),
                };

            }

            
            //var identity = CreateIdentity(user);
            IPrincipal principal = new GenericPrincipal(new GenericIdentity(user.username, BasicAuthResponseHeaderValue), null);
            Thread.CurrentPrincipal = principal;
            HttpContext.Current.User = principal;

user class

public bool full(string username, string password)
{

    var query = from s in db.Subscriptions
                join u in db.UserDetails on s.sUID equals u.uID
                where s.sPriceABS_ExpiryDate >= DateTime.Now &&
                s.sPID.Value == 163 &&
                s.All.Value == true &&
                u.uUsername == username &&
                u.uPassword == password
                select u; //

    // "execute" the query
    return query.FirstOrDefault() != null;

}

Is this correct approach. Please help. Many thanks.