Well actually, I'm developing a windows application that contains a 
textbox (to capture text) and an image. The problem is how can I implement 
the save dialog that save these 2 things into a file and so do the open 
dialog that opens these 2 things into the textbox and image correctly.

Instead of saving the 2 components into a single file, I have an idea of 
saving the 2 components in seperate files in a directory (for instance the 
text will be in .txt and the image will be in .jpeg). If I'm going to use 
this approach, I will be facing the problems of creating a directory for 
the files and I'll need a special file extension (for example .bla) that 
will get the 2 files and load it to the textbox and imagebox. And the 
saving problem too.