Decision Tree Visualisation

Question

Hey guys, My final project is Decision Tree Creator and I have to use C4.5 and ID3 algorithms for generating the tree. You know that these algorithms are calculating entropy and information gain for every attributes. I finished these parts and I know that whict attribute will be on the top and its branches but I have a problem for generating the tree on the screen. I heard that there is a library for generating the tree on the screen. I have to show attributes' names, their percentage and possible datas' names on the nodes and branches.

 

If you know that library's name, please tell me and I can not use weka or other tool for this operation... 

This library should be for C# !