Algorithm for ordering a set [closed]

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I have a set of 50 items and many conditions that specificy which element should come before other.

How to I create a ordered list?

Will like it in C# though can translate it from other languages.

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Topological Sort

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Translate the "many conditions" into a comparison function, and then use that in conjunction with a comparison-based sort (in the general case).

The best comparison-based sorting algorithms are O(nlogn) in the best case. Merge sort is one such algorithm and is pretty easy to implement... there are many others.

If your conditions constitute a partial ordering (rather than a total ordering), Topological sort might be most appropriate.

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There are a number of sorting algorithms you can look into. The two that come to mind off the top of my head are the bubble sort and the quick sort.