Question

public bool IsUser(string username)
    {
        bool user = false;
        using (var client = new datingEntities())
        {
            var result = from x in client.Person
                         select x;

            foreach (var item in result)
            {
                if (item.Username == username)
                {
                    user = true;
                }
            }
        }
        return user;
    }

This method am I using to get data from a SQL database that I have. It’s no problem with the database connection, it’s just that it always is returning false even if the parameter username is existing in the database (double checked the data in the database). I tried this method before and then it worked but it don’t. I’m using entity framework against my database

Answer 1

This will do:

public bool IsUser(string username)
{
    using (var entities = new datingEntities())
    {
        return entities.Person.Any(p => p.Username == username);
    }
}

Now you request all user entities and loop through them to see if the user matches the queried username. You should let Entity Framework or LINQ write the queries, which you do as demonstrated above.

As for the reason your function is not working: set a breakpoint, find out if any users are found at all. We can’t debug that for you.