C#

private void CallBack( object sender, IntPtr e )
    {
      lock( IncomingBmp )
      {
        IncomingBmp.Enqueue ( e );

        if( IncomingBmp.Count > 10)
        {
          UpdateBitmap( IncomingBmp.Dequeue() );
        }
      }
    }

    private void UpdateBitmap( IntPtr img )
    {
      if( this.pictureBox1.InvokeRequired == true )
      {
        UpdateBitmapCallback p = new UpdateBitmapCallback( UpdateBitmap );
        this.Invoke( p, img );
      }
      else
      {
        Image oldImage = this.pictureBox1.Image;
        this.pictureBox1.Image = Image.FromHbitmap( img );
        if( oldImage != null )
            oldImage.Dispose();      
      }  
    }

private void Button1_Click(object sender, EventArgs e)
            {
                ?????????
            }

static string DecodeUnicode(string s)
 {
	StringBuilder sb=new StringBuilder();
	while (s.Length!=0)
         {
	    sb.Append((char)int.Parse(s.Substring(2, 4), NumberStyles.HexNumber));		
	    s=s.Substring(6);
         }	
        return sb.ToString();
  }

string s="\\u092A\\u094B\\u0937\\u093E\\u0939\\u093E\\u0930";
s=DecodeUnicode(s);

e.g.:string s="\\u092A\\u094B\\u0937\\u093E\\u0939\\u093E\\u0930 abc";

UnmanagedResource.Open(delegate callback);
...
callback called with Opened message
...
... // app does interesting stuff
...

UnmanagedResource.Close(); // will return immediately
...
callback called with Closed message