XCore.PanelEx.OnPaintBackground C# (CSharp) Method

		protected override void OnPaintBackground (PaintEventArgs e)
		{
			base.OnPaintBackground (e);

			var rectangleToPaint = ClientRectangle;
			if (rectangleToPaint.Width <= 0 || rectangleToPaint.Height <= 0)
				return; // can't draw anything, and will crash if we try
			var beginColor = Color.FromArgb(0x58, 0x80, 0xd0);
			var endColor = Color.FromArgb(0x08, 0x40, 0x98);

			using (var brush = new LinearGradientBrush(rectangleToPaint, beginColor, endColor,
				LinearGradientMode.Vertical))
			{
				e.Graphics.FillRectangle(brush, rectangleToPaint);
			}

			// Draw a background image if we have one set.
			// This code assumes it is always centered.

			Graphics g = e.Graphics;
			var backgroundImage = this.BackgroundImage;
			if (backgroundImage != null)
			{
				var drawRect = new Rectangle();
				drawRect.Location = new Point(ClientSize.Width / 2 - backgroundImage.Width /2,
											  ClientSize.Height /2 - backgroundImage.Height /2);
				drawRect.Size = backgroundImage.Size;
				g.DrawImage( backgroundImage, drawRect);
			}
		}