C#

string fileName = @"C:\myImage.jpg";
using (StreamReader fileReader = new StreamReader(fileName))
using (Stream Img = fileReader.BaseStream)
{
    this.pictureBox1.Image = new System.Drawing.Bitmap(Img);
}

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-Spacix
All your skynet questions[^] belong to solved

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I dislike the black-and-white voting system on questions/answers.

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class IPCMsgHandler
{
	private Thread listenThread = new Thread(ListeningThreadFunc);

...

	public void Start()
	{
		listenThread.Start(this);
	}

	private static void ListeningThreadFunc(object data)
	{
		IPCMsgHandler helper = data as IPCMsgHandler;

		...

		//helper.OnMessage(); doesn't work...staying in current thread context

		MethodInvoker mi = new MethodInvoker(helper.OnMessage);
		mi.Invoke();

		...
	}
}

public class AutoCADApplication : IExtensionApplication
{
	IPCMsgHandler helper = null;

	public void Initialize()
	{
		// I have the right execution-context here
		this.helper = new IPCMsgHandler("AutoCAD-IPCServer", new IPCMsgHandler.MessageHandler(this.OnIPCMessage));
		this.helper.Start();
	}
	private void OnIPCMessage()
	{
		// I have the WRONG execution-context here
		return;
	}