null reference exception was unhandled :|

Code:

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Public Class Form1


    Dim int As Integer = 0
    Dim CustomerTable As New DataTable
    Dim instance As New InvalidOperationException()

    Class TestClass
        Public field1 As Integer
        Dim field2 As Boolean
    End Class




    Private Sub Loading(ByVal sender As Object, ByVal e As Windows.Forms.WebBrowserProgressChangedEventArgs)
        ToolStripProgressBar1.Maximum = e.MaximumProgress
        ToolStripProgressBar1.Value = e.CurrentProgress
    End Sub
    Private Sub Done(ByVal sender As Object, ByVal e As Windows.Forms.WebBrowserDocumentCompletedEventArgs)

        TabControl1.SelectedTab.Text = CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).DocumentTitle
        ToolStripComboBox1.Text = CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).Url.ToString


    End Sub
    Private Sub ToolStripButton1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton1.Click
        CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).GoBack()
    End Sub

    Private Sub ToolStripButton2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton2.Click
        CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).GoForward()
    End Sub

    Private Sub ToolStripButton3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton3.Click
        CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).Refresh()
    End Sub

    Private Sub ToolStripButton4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton4.Click
        CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).GoHome()

    End Sub

    Private Sub ToolStripButton5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton5.Click
        CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).Navigate(ToolStripComboBox1.Text)
    End Sub
    Private Sub ToolStripButton6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton6.Click
        CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).GoSearch()
    End Sub

    Private Sub PageProprietysToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles PageProprietysToolStripMenuItem.Click
        CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).ShowPropertiesDialog()

    End Sub
    Private Sub ToolStripButton10_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton10.Click
        Dim Browser As New WebBrowser
        TabControl1.TabPages.Add("New Page")
        TabControl1.SelectTab(int)
        Browser.Name = "FireWolf"
        Browser.Dock = DockStyle.Fill
        TabControl1.SelectedTab.Controls.Add(Browser)
        AddHandler Browser.ProgressChanged, AddressOf Loading
        AddHandler Browser.DocumentCompleted, AddressOf Done

        int = int + 1
    End Sub







    Private Sub PasteToolStripButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles PasteToolStripButton.Click
        If Not TabControl1.TabPages.Count = 1 Then
        End If
        TabControl1.TabPages.RemoveAt(TabControl1.SelectedIndex)
        TabControl1.SelectTab(TabControl1.TabPages.Count - 1)
        int = int - 1
    End Sub

    Private Sub ToolStripButton9_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton9.Click
        CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).Navigate("www.youtube.com")
    End Sub

    Private Sub ToolStripButton8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton8.Click
        CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).Navigate("www.yahoo.com")
    End Sub

    Private Sub ToolStripButton7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton7.Click
        CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).Navigate("www.google.com")
    End Sub

    Private Sub ToolStripComboBox1_keydown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles ToolStripComboBox1.KeyDown
        If e.KeyCode = Keys.Enter Then
            ToolStripComboBox1.Items.Add(ToolStripComboBox1.Text)
            CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).Navigate(ToolStripComboBox1.Text)
            Me.Text = (ToolStripComboBox1.Text)

        End If
    End Sub
    Private Sub ToolstripCombobox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripComboBox1.SelectedIndexChanged
        CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).Navigate(ToolStripComboBox1.Text)
    End Sub

End Class

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This is the code this exception occurs when i click on the home button of my webbrowser.
Or i enter any site on the combobox.

This is not VBScript. Maybe VB.Net?

Do me and the rest of us a favor, please? Point out which line is the problem... you haven't given the buttons meaningfulnames, and I'm not going to even begin to try to figure out which of those buttons is your "home" button....

-tg

Based on Guuby's profile saying "Visual Basic 2008 express edition", I have moved this thread to our 'VB.Net' (VB2002 and later) forum.

Ok first of all i am very sorry it is my first time here don't know exactly where to post i will try to give all the information demanded.
I will make some screens to the problem.
This exceptions always come if my browser navigates on a site or just press the button to go home...
http://img121.imageshack.us/img121/3069/part2r.jpg
http://img710.imageshack.us/img710/8416/problem.jpg

Code:

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CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).GoHome()

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This is the line that gives me the exception but this time it gives ArgumentOutOfRange Exception was unhandled...