C# login examples

Question

I am having trouble hiding my main form for a login form. Once user has logged in to close login form and show main form.

I have been confusing myself that much I ha

Answer 1

So ... Here is my login :) You can like it or don't like, but so ... This is my solution.

    private void FRIIB_Load(object sender, EventArgs e)
    {
        try
        {
            QueryBuilder.insql = Crypto.DecryptStringAES(Model.DecryptRegisteryValue("inSQL"), "inSQL");
        }
        catch (Exception exc)
        {
            MessageBox.Show(exc.Message);
        } // getting connection string
        if (!(new Func(() =>
                {
                    Func l = null; l = () =>
                    {
                        using (LoginForm loginDialog = new LoginForm())
                        {
                            loginDialog.ShowDialog();
                            loginDialog.Focus();
                            if (loginDialog.IsExit) return false;
                            else
                                if (loginDialog.IsAuthorized) return true;
                                else return l();
                        }
                    }; return l();
                }
              )()
            )) Close(); 
        else w8( () => LoadData() );
    }

and here is some description for code :

    private void w8(Action action)
    {
        Cursor.Current = Cursors.WaitCursor;
        Application.DoEvents();
        action();
        Cursor.Current = Cursors.Default;
    }

Public Class DamnLogin
    Private db As FRIIB

    Public Sub New(ByVal connection As String)
        db = New FRIIB(connection)
    End Sub

    Public Function Login(ByVal name As String, ByVal password As String) As Boolean
        Dim GetUser = _
           From u In db.GetTable(Of [User])() _
           Where u.Name = name _
           And u.Password = password _
           Select u
        Return GetUser.Count = 0
    End Function
End Class

let Login usename password = 
    new LinqBase.DamnLogin(insql) |> fun damn ->
        not <| damn.Login(usename,password)

and login form

public partial class LoginForm : Form
{
    bool isAuthorized;
    bool exit;

    public bool IsAuthorized    { get { return this.isAuthorized;   } }
    public bool IsExit          { get { return this.exit;           } }

    public LoginForm()
    {
        isAuthorized    = false;
        exit            = false;

        InitializeComponent();
    }

    private void Close_Click(object sender, EventArgs e)
    {
        exit = true; 
        this.Close();
    }

    private void LoginButton_Click(object sender, EventArgs e)
    {
        if (Login.Text != "")
        {
            if (Login.Text.ToUpper() == "ADMIN")
            {
                if (Password.Text == Crypto.DecryptStringAES(Model.DecryptRegisteryValue("Password"), "Password"))
                    isAuthorized = true;
            }
            else
            {
                if (QueryBuilder.Login(Login.Text, Password.Text))
                    isAuthorized = true;
            }
        }

        this.Close();
    }
}