test.cs

string url = "https://www.textcontrol.com/img/corporate_id/tx_logo.svg";

using (WebClient client = new WebClient())
{
	byte[] bytes = client.DownloadData(url);

	using (MemoryStream ms = new MemoryStream(
		  bytes, 0, bytes.Length, writable: false, publiclyVisible: true))
	{
		// create image object
		TXTextControl.Image myImage = new TXTextControl.Image(ms);
		textControl1.Images.Add(myImage, -1);
	}
}