XNA Split screen on 4 Viewports

private Viewport[] _viewports = new Viewport[5];

private void SetupViewports()
{
 int HalfWidth = this._GraphicsDeviceManager.PreferredBackBufferWidth / 2;
 int HalfHeight = this._GraphicsDeviceManager.PreferredBackBufferHeight / 2;

 // full screen viewport for full screen text:
 _viewports[0] = new Viewport();
 _viewports[0].X = 0;
 _viewports[0].Y = 0;
 _viewports[0].Width = 2 * HalfWidth;
 _viewports[0].Height = 2 * HalfHeight;

 // 1/4 screen viewports:
 _viewports[1] = new Viewport();
 _viewports[1].X = 0;
 _viewports[1].Y = 0;
 _viewports[1].Width = HalfWidth;
 _viewports[1].Height = HalfHeight;

 _viewports[2] = new Viewport();
 _viewports[2].X = HalfWidth;
 _viewports[2].Y = 0;
 _viewports[2].Width = HalfWidth;
 _viewports[2].Height = HalfHeight;

 _viewports[3] = new Viewport();
 _viewports[3].X = 0;
 _viewports[3].Y = HalfHeight;
 _viewports[3].Width = HalfWidth;
 _viewports[3].Height = HalfHeight;

 _viewports[4] = new Viewport();
 _viewports[4].X = HalfWidth;
 _viewports[4].Y = HalfHeight;
 _viewports[4].Width = HalfWidth;
 _viewports[4].Height = HalfHeight;
}

public void DrawScene()
{
 for (int i = 0; i < 4; ++i)
 {
  _GraphicsDevice.Viewport = _viewports[i + 1];
  // TODO: set view and projection matrix
  // TODO: draw viewport
 }

 _GraphicsDevice.Viewport = _viewports[0];
 // TODO: set view and projection matrix
 // TODO: draw full screen text
}