[2005] Application.Quit() giving an error

[Icyculyr Fr0st]

When I click my Exit Program button, it says

Object reference not set to an instance of an object.

And sometimes I don't quite remember but it says something along the line of

RoundRobinPro is Disposed... (My Main app)

This is my login form, which I have made, the code I use is below

Option Strict On
Option Explicit On

Public Class LoginForm1
    Private Sub OK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles LoginButton.Click
        Dim quit As Boolean = True
        If SignupRadio.Checked Then
            If System.IO.Directory.Exists("C:\Program Files\Round Robin Pro\Variables\" & _
            UsernameTextBox.Text) Then
                quit = False
            Else
                System.IO.Directory.CreateDirectory("C:\Program Files\Round Robin Pro\Variables\" & _
                UsernameTextBox.Text)
                RoundRobinPro.Dir.UsernameDir = RoundRobinPro.fnc _
                .CapitalizeString(UsernameTextBox.Text)
                MsgBox("Your account has been created", MsgBoxStyle.OkOnly)
            End If
        End If
        Dim errorString As String = ""
        If LoginRadio.Checked Then
            If Not UsernameTextBox.Text.Length > 4 Then
                quit = False
                errorString &= "Your username must be atleast 5 characters long." & ControlChars.NewLine
            End If
            If Not PasswordTextBox.Text.Length > 4 Then
                quit = False
                errorString &= "Your password must be atleast 5 characters long." & ControlChars.NewLine
            End If
            If Not ConfirmPw_t.Text.Length > 4 Then
                quit = False
                errorString &= "Your confirm password must be atleast 5 characters long." & _
                ControlChars.NewLine
            End If
        End If

        If quit Then
            Me.Close()
        Else
            MsgBox(errorString)
        End If
    End Sub

    Private Sub Cancel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
        Me.Close()
    End Sub

    Private Sub Timer123_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer123.Tick
        If SignupRadio.Checked Then
            ConfirmPw_t.Visible = True
            ConfirmPw_l.Visible = True
            LoginButton.Text = "Signup"
        Else
            ConfirmPw_t.Visible = False
            ConfirmPw_l.Visible = False
            LoginButton.Text = "Login"
        End If
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Application.Exit()
    End Sub
End Class

Anyone know what's wrong?

[Icyculyr Fr0st]

Bumpedy Bump, Does anyone know, I still have not figured it out

[drpcken]

Instead of Application.Exit(), just try End. Like this:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        End
End Sub

[sapator]

END is not a good practice, thought it may help you here it may become an unhealthy habit.
You should create a try catch block or try to do yourform.hide instead of .close

[RobDog888]

End is a Legacy function from VB6 and shouldnt be used in .NET.

Where are you creating the object "RoundRobinPro"? Seems its not created so when you try to access one of its properties or methods you will get that exact error.

[drpcken]

End is a Legacy function from VB6 and shouldnt be used in .NET.

oh wow I wasn't aware it was bad practice. Learn something new every day
Thanks!

[Al42]

It was the only way to end a BASIC program, because there was no window to close or object to dispose of. Forget that you can use End on a line by itself (End Sub and End Function are mandatory) and you'll save yourself a lot of grief in the future.

As one of the posters here says, closing the form is like escorting your guests to the street after the party is over. Using End is like pushing them off the 25th floor balcony. Either way will get them to the street, and the balcony route is faster, but ...

[kleinma]

yeah just look at the documentation for END, while its pretty complete documentation, there are several places in it where they advise against using it.

http://msdn2.microsoft.com/en-us/lib...ba(VS.80).aspx