private void button1_Click(object sender, EventArgs e)
{
            getCurrentApps();
}
private void RefreshWindowList()
{
            newwindowlist = new List<String>();
            newhandlelist = new List<IntPtr>();
            EnumWindows(EnumWinProc,-1);
}
private void getCurrentApps()
{
            RefreshWindowList();
            listBox1.Items.Clear();
            int count = 0;
            foreach (String item in newwindowlist)
            {
                listBox1.Items.Add((item));
                count += 1;
            }
}
private void listBox1_itemChanged(object sender, EventArgs e)
{
            string[] splitString = listBox1.SelectedItem.ToString().Split(new _
              Char[] { ':' });
            FindAndSendKey(splitString[1], splitString[0]);            
}
private void FindAndSendKey(String WindowClassName, String WindowTitle)
{        
            // Get a handle to the Calculator application. The window class
            // and window name were obtained using the Spy++ tool.
            //MessageBox.Show(WindowClassName + "," + WindowTitle);
            IntPtr appHandle = FindWindow(WindowClassName, WindowTitle);
 
            // Verify that Calculator is a running process.
            if (appHandle == IntPtr.Zero)
            {
                MessageBox.Show("The application ist NOT running.");
                return;
            }
 
            // Make the application the foreground application and send it 
            // a set of keys.
            SetForegroundWindow(appHandle);
 
            SendKeys.Send("b");
            this.getCurrentApps();
 
 }