public void GetData<T> (
         T[] data
) where T : ValueType

if (Mouse.GetState().LeftButton == ButtonState.Pressed &&   // If the left button is pressed
    Mouse.GetState().X > 0 && Mouse.GetState().Y > 0 &&     // and we are inside the game window
    Mouse.GetState().X < graphics.GraphicsDevice.PresentationParameters.BackBufferWidth &&
    Mouse.GetState().Y < graphics.GraphicsDevice.PresentationParameters.BackBufferHeight)
{
    backBufferData = new ResolveTexture2D(
        graphics.GraphicsDevice,
        graphics.GraphicsDevice.PresentationParameters.BackBufferWidth,
        graphics.GraphicsDevice.PresentationParameters.BackBufferHeight,
        1,
        graphics.GraphicsDevice.PresentationParameters.BackBufferFormat);


    Rectangle sourceRectangle =
        new Rectangle(Mouse.GetState().X, Mouse.GetState().Y, 1, 1);

    Color[] retrievedColor = new Color[1];

    graphics.GraphicsDevice.ResolveBackBuffer(backBufferData);

    backBufferData.GetData<Color>(
        0,
        sourceRectangle,
        retrievedColor,
        0,
        1);
}