Автоматический захват веб-камеры после неудачного входа в систему три раза

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Я делаю приложение для своего школьного проекта, которое заключается в том, что когда пользователь подключает usb-накопитель, login for выйдет с просьбой сначала войти в систему, но если пользователь не смог войти в систему в течение трех раз, веб-камера автоматически захватит. Проблема здесь в том, как я могу заставить веб-камеру автоматически захватывать после неудачного входа в систему в течение трех раз?

Вот кодировка для входа в систему

Public Class Login

    Private Sub LoginButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles LoginButton.Click
        'Check if username or password is empty
        If PasswordTextBox.Text = "" Or UsernameTextBox.Text = "" Then
            MessageBox.Show("Please fill-up all fields!", "Authentication Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
            'Clear all fields
            PasswordTextBox.Text = ""
            UsernameTextBox.Text = ""

            'Focus on Username field
            UsernameTextBox.Focus()

        Else
            ' Connect to DB
            Dim conn As New System.Data.OleDb.OleDbConnection()
            conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\\PutLock.mdb;Persist Security Info=True;Jet OLEDB:Database Password=password"

            Try
                'Open Database Connection
                conn.Open()

                Dim sql As String = "SELECT * FROM PutLockSignUp WHERE Username='" & UsernameTextBox.Text & "' AND Password = '" & PasswordTextBox.Text & "'"
                Dim cmd As OleDbCommand = New OleDbCommand(sql, conn)

                Dim sqlRead As OleDbDataReader = cmd.ExecuteReader()

                If sqlRead.Read() Then
                    UsernameTextBox.Clear()
                    PasswordTextBox.Clear()

                    MainPage.Show()
                    Me.Hide()

                Else
                    ' If user enter wrong username or password
                    MessageBox.Show("Sorry, username or password not found!", "Authentication Failure", MessageBoxButtons.OK, MessageBoxIcon.Error)

                    'Clear all fields
                    PasswordTextBox.Text = ""
                    UsernameTextBox.Text = ""

                    'Focus on Username field
                    UsernameTextBox.Focus()
                End If

            Catch ex As Exception
                MessageBox.Show("Failed to connect to Database", "Database Connection Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
            End Try

        End If
    End Sub


    Private Sub ExitButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ExitButton.Click
        End
    End Sub
End Class


Coding for webcam which i found from google

Public Class Form1
    Const WM_CAP As Short = &H400S
    Const WM_CAP_DRIVER_CONNECT As Integer = WM_CAP + 10
    Const WM_CAP_DRIVER_DISCONNECT As Integer = WM_CAP + 11
    Const WM_CAP_EDIT_COPY As Integer = WM_CAP + 30
    Const WM_CAP_SET_PREVIEW As Integer = WM_CAP + 50
    Const WM_CAP_SET_PREVIEWRATE As Integer = WM_CAP + 52
    Const WM_CAP_SET_SCALE As Integer = WM_CAP + 53
    Const WS_CHILD As Integer = &H40000000
    Const WS_VISIBLE As Integer = &H10000000
    Const SWP_NOMOVE As Short = &H2S
    Const SWP_NOSIZE As Short = 1
    Const SWP_NOZORDER As Short = &H4S
    Const HWND_BOTTOM As Short = 1
    Dim iDevice As Integer = 0
    Dim hHwnd As Integer
    Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hWnd As IntPtr, ByVal Msg As Integer, ByVal wParam As IntPtr, ByRef RECT As IntPtr) As IntPtr
    Declare Function SetWindowPos Lib "user32" Alias "SetWindowPos" (ByVal hwnd As Integer, ByVal hWndInsertAfter As Integer, ByVal x As Integer, ByVal y As Integer, ByVal cx As Integer, ByVal cy As Integer, ByVal wFlags As Integer) As Integer
    Declare Function DestroyWindow Lib "user32" (ByVal hndw As Integer) As Boolean
    Declare Function capCreateCaptureWindowA Lib "avicap32.dll" (ByVal lpszWindowName As String, ByVal dwStyle As Integer, ByVal x As Integer, ByVal y As Integer, ByVal nWidth As Integer, ByVal nHeight As Short, ByVal hWndParent As Integer, ByVal nID As Integer) As Integer
    Declare Function capGetDriverDescriptionA Lib "avicap32.dll" (ByVal wDriver As Short, ByVal lpszName As String, ByVal cbName As Integer, ByVal lpszVer As String, ByVal cbVer As Integer) As Boolean

    Private Sub LoadDeviceList()
        Dim strName As String = Space(100)
        Dim strVer As String = Space(100)
        Dim bReturn As Boolean
        Dim x As Integer = 0
        Do
            bReturn = capGetDriverDescriptionA(x, strName, 100, strVer, 100)
            If bReturn Then lstDevices.Items.Add(strName.Trim)
            x += 1
        Loop Until bReturn = False
    End Sub

    Private Sub OpenPreviewWindow()
        Dim iHeight As Integer = picCapture.Height
        Dim iWidth As Integer = picCapture.Width
        hHwnd = capCreateCaptureWindowA(iDevice, WS_VISIBLE Or WS_CHILD, 0, 0, 640, 480, picCapture.Handle.ToInt32, 0)
        If SendMessage(hHwnd, WM_CAP_DRIVER_CONNECT, iDevice, 0) Then
            SendMessage(hHwnd, WM_CAP_SET_SCALE, True, 0)
            SendMessage(hHwnd, WM_CAP_SET_PREVIEWRATE, 66, 0)
            SendMessage(hHwnd, WM_CAP_SET_PREVIEW, True, 0)
            SetWindowPos(hHwnd, HWND_BOTTOM, 0, 0, picCapture.Width, picCapture.Height, SWP_NOMOVE Or SWP_NOZORDER)
            btnSave.Enabled = True
            btnStop.Enabled = True
            btnStart.Enabled = False
        Else
            DestroyWindow(hHwnd)
            btnSave.Enabled = False
        End If
    End Sub

    Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click
        Dim data As IDataObject
        Dim bmap As Image
        SendMessage(hHwnd, WM_CAP_EDIT_COPY, 0, 0)
        data = Clipboard.GetDataObject()
        If data.GetDataPresent(GetType(System.Drawing.Bitmap)) Then
            bmap = CType(data.GetData(GetType(System.Drawing.Bitmap)), Image)
            picCapture.Image = bmap
            ClosePreviewWindow()
            btnSave.Enabled = False
            btnStop.Enabled = False
            btnStart.Enabled = True
            If sfdImage.ShowDialog = DialogResult.OK Then
                bmap.Save(sfdImage.FileName, Imaging.ImageFormat.Bmp)
            End If
        End If
    End Sub

    Private Sub ClosePreviewWindow()
        SendMessage(hHwnd, WM_CAP_DRIVER_DISCONNECT, iDevice, 0)
        DestroyWindow(hHwnd)
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        LoadDeviceList()
    End Sub

    Private Sub btnStart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnStart.Click
        OpenPreviewWindow()
        btnStart.Enabled = False
        btnStop.Enabled = True
    End Sub

    Private Sub btnStop_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnStop.Click
        ClosePreviewWindow()
        btnStart.Enabled = True
        btnStop.Enabled = False

    End Sub
End Class

Thanks in advance ^^

What I have tried:

I have tried doing research on how to use timer because ive read somewhere that one of the solution is by using timer but i dont know how to use it to solve my prob.

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