Question

I found this site which was describing a very simple user authentication for LINQ to SQL as at codesamplez.com.

My data in the Database looks like this

| id  | name | password |
+-----+------+----------+
| 1   | tic  | test     |
| 2   | tac  | test     |
| 3   | toe  | test     |

For some strange reason the data doesnt validate as I expect, when I call

 bool b  = IsValidUser("tic" , "test");

this returns FALSE,
But any time I pass the same Username and password combination

 bool b  = IsValidUser("tic" , "tic");

or

 bool b  = IsValidUser("a" , "a");

or

 bool b  = IsValidUser("b" , "b");

it returns true!

below is the code which is basically identical to the referenced page.

public bool IsValidUser(string userName, string passWord)
{
    DataClasses1DataContext db = new DataClasses1DataContext();
    var users = from u in db.Users
                      where u.name == userName
                      && u.password == passWord
                      select u;

    return Enumerable.Count(users) > 0;
}

Update:
The User class:

[global::System.Data.Linq.Mapping.TableAttribute(Name="dbo.Users")]
public partial class User
{
    private int _id;
    private string _name;
    private string _password;

    public User()
    {
    }

    [global::System.Data.Linq.Mapping.ColumnAttribute(Storage="_id", DbType="Int NOT NULL")]
    public int id
    {
        get
        {
            return this._id;
        }
        set
        {
            if ((this._id != value))
            {
                this._id = value;
            }
        }
    }

    [global::System.Data.Linq.Mapping.ColumnAttribute(Storage="_name", DbType="NChar(10)")]
    public string name
    {
        get
        {
            return this._name;
        }
        set
        {
            if ((this._name != value))
            {
                this._name = value;
            }
        }
    }

    [global::System.Data.Linq.Mapping.ColumnAttribute(Storage="_password", DbType="NChar(10)")]
    public string password
    {
        get
        {
            return this._password;
        }
        set
        {
            if ((this._password != value))
            {
                this._password = value;
            }
        }
    }
}

Answer 1

Thanks everyone, all very helpful info now. It was my own mistake here, the Database didnt have the data I expected in it. I had 2 database servers and the new data hadnt replicated over to the development server.