C#

private void button1_Click(object sender, EventArgs e)
{
    Thread nThread = new Thread(delegate()
    {
        int i=0;
        while (i < progressBar1.Maximum)
        {
            progressBar1.Invoke((MethodInvoker)delegate
            {
                progressBar1.Value = i++;
            });
            Thread.Sleep(500);
        }
    });
    nThread.Start();
}

<br />
GDI32.BitBlt(capHDC,0,0,width,height,wndHDC,x,y,GDI32.SRCCOPY); <br />

<br />
USER32.SendMessage( wndHWND, Constants.WM_PRINT, capHDC, (IntPtr)( Constants.PRF_CHILDREN + Constants.PRF_CLIENT + Constants.PRF_OWNED ) );<br />

<br />
[DllImport("user32.dll", SetLastError=true)]<br />
static extern IntPtr PrintWindow(IntPtr hwnd, IntPtr hDC, uint nFlags);<br />

[DllImport("Kernel32")]
private static extern Boolean GetSystemPowerStatus(SystemPowerStatus sps);
[StructLayout(LayoutKind.Sequential)]
public class SystemPowerStatus
{
        public ACLineStatus _ACLineStatus;
        public BatteryFlag  _BatteryFlag;
        public Byte         _BatteryLifePercent;
        public Byte         _Reserved1;
        public Int32        _BatteryLifeTime;
        public Int32        _BatteryFullLifeTime;
}

public enum ACLineStatus : byte
{
    Offline = 0, Online = 1, Unknown = 255
}

public enum BatteryFlag : byte
{
        High = 1,
        Low = 2,
        Critical = 4,
        Charging = 8,
        NoSystemBattery = 128,
        Unknown = 255
}

private void button1_Click(object sender, EventArgs e)
{
    SystemPowerStatus sps = new SystemPowerStatus();
    GetSystemPowerStatus(sps);
    if (sps != null)
    {
        MessageBox.Show(string.Format("Current battery life is at {0}%.", sps._BatteryLifePercent));
    }
}