VB de yazılmış kodda değişim

    For Each p As Process In Process.GetProcesses
            If p.ProcessName.Contains("KnitPaint") Then
                Me.Text = p.MainWindowTitle
            End If
        Next

Imports System.Runtime.InteropServices
Public Class Form1

    <DllImport("user32.dll")> _
    Private Shared Function GetForegroundWindow() As IntPtr
    End Function

    <DllImport("user32.dll")> _
    Private Shared Function GetWindowText(ByVal hWnd As IntPtr, ByVal text As System.Text.StringBuilder, ByVal count As Integer) As Integer
    End Function

    Private Function GetActiveWindowTitle() As String


        Const nChars As Integer = 256
        Dim handle As IntPtr = IntPtr.Zero
        Dim Buff As New System.Text.StringBuilder(nChars)
        handle = GetForegroundWindow()



        If GetWindowText(handle, Buff, nChars) > 0 Then
            Return Buff.ToString()
        End If
        Return Nothing
    End Function

    Dim tmr As New Timer

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        tmr.Interval = 3000
        AddHandler tmr.Tick, AddressOf gecti
        tmr.Start()
    End Sub

    Sub gecti(ByVal sender As Object, ByVal e As System.EventArgs)
        ListBox1.Items.Add(GetActiveWindowTitle())
    End Sub

End Class