EasyDraw is a project I used to learn C# and WPF.
EasyDraw is an app that lets you draw.
You can save and load ink files, and export those files to a bitmap format. Also, the pen type, size and colour is customizable.
Finally, there is also handwriting recognition.
You can compile the source, or you can download the zip file of binaries here. The current version is v2.1. Other releases can be found on the releases page.