C# WPF OpenNI 1.5.7 programming , sample program can compiled and works, but contain UNSAFE coding, want to refine program to safe coding -- 4

C# WPF OpenNI 1.5.7 programming , have sample program can compiled and works, but contain UNSAFE coding, want to refine program to safe coding This project required to have Depth Camera. Such as LIPS DL camera. change Openni (1.5.7) program to safe coding. and program has using bitmap drawing user from video, if add lebal to [login to view URL] to display Skeleton reading values, the program will show the error, related openni control belong another thread. The error can be using [login to view URL] to temperate solve. but if run program long , then new error message "A generic error occurred in GDI+," Want to refine coding to solve. development platform: Windows 10 Visual Studio 2013 Openni 1.5.7 Project task: Want to have program in C# WPF source code refine to safe coding.