Private Sub genel_Click()
On Error GoTo Err_genel_Click
Dim sifre As String
 
 sifre= InputBox("Bu forma giriş yapabilmek " & Chr(10) & Chr(10) & "için lütfen şifreyi giriniz...", "Şifreli Giriş Alanı")

 If sifre= "" Or sifre= Empty Then
 MsgBox "Şifre alanını boş bıraktınız." & vbCrLf & 
"Şifrenizi girmediğiniz sürece bu formu göremezsiniz." & vbCrLf & 
"Form içeriğini görebilmek için lütfen şifrenizi giriniz...", , "Boş Alan Uyarısı"
 
 Exit Sub
 End If

 If sifre= "12345" Then 'Buraya yazacağınız kelime şifreniz olacaktır.
 
 DoCmd.OpenForm "KONTROL_İZLEME_FORMU" 'Açılacak formun adını belirleyiniz.
 
 Else
 MsgBox "Hatalı Şifre Girdiniz."

 End If
Exit_genel_Click:
 Exit Sub

Err_genel_Click:
 MsgBox Err.Description
 Resume Exit_genel_Click
 
End Sub

Public Class Form1

Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Int32
Private Declare Function GetWindow Lib "user32" (ByVal hwnd As Int32, ByVal wCmd As Int32) As Int32
Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Int32, ByVal wMsg As Int32, ByVal wParam As Int32, ByVal lParam As Int32) As Int32

Dim inputTitle As String = "Enter the Password!"
Dim returnedPW As String
Const asteriskKeyCode = 42
Public Const EM_SETPASSWORDCHAR = &HCC
Public Const WM_CREATE = &H1
Dim windowHandle As Int32
Public Const GW_CHILD = 5

Public Sub setPassword()
Dim editWindow As Int32
editWindow = GetWindow(windowHandle, GW_CHILD)
SendMessage(editWindow, EM_SETPASSWORDCHAR, asteriskKeyCode, 0)
End Sub
Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
MyBase.WndProc(m)
If m.Result.ToInt32 = WM_CREATE Then
windowHandle = FindWindow(vbNullString, inputTitle)
ElseIf windowHandle > 0 Then
setPassword()
windowHandle = 0
End If
End Sub

Private Sub btnDisplay_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDisplay.Click
lblPw.Text = "InputBox Password:"
returnedPW = InputBox("Enter the Password In the box!", inputTitle, "password!", 0)
If Not returnedPW = Nothing AndAlso returnedPW = "password!" Then
lblPw.Text = "InputBox Password Is: " & returnedPW
Else
lblPw.Text = "InputBox Password Is: Wrong!"
MessageBox.Show("Wrong Password!", " Try Again")
End If
End Sub
End Class