FindWindowA

C# Signature:

[DllImport("user32.dll", SetLastError=true)]
static extern IntPtr FindWindowA(string lpClassName, string lpWindowName);

VB Signature:

Declare Function FindWindowA Lib "user32.dll" (lpClassName As String, lpWindowName As String) As Long

Sample Code:

[DllImport("user32.dll", SetLastError = true)]
    static extern IntPtr FindWindowA(string lpClassName, string lpWindowName);

    private void test()
    {
    var handle = FindWindowA(null, "Untitled - Notepad");
    MessageBox.Show(handle.ToString() ?? "error");
    }