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However i want to convert the complete source code of FET into C#
Pick a source file and start converting. Not sure what kind of "guide" you want us to give you. Converting from one language to another is a subjective process both in the use of the languages and the experience of the user. I know you vaguely said your experience but no small answer is going to "guide" you through a conversion. You just need to pick somewhere, start converting, and come back with specific problems.
[EDIT]
There is something better right here on CodeProject that would probably not need any converting.
ToDoList 6.7.8 Feature Release - An effective and flexible way to keep on top of your tasks[
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