About the same, the majority of times its not down the programming language, its down to the configuration of the hosting environment.
Personally I feel like open source solutions are generally more secure, because a security issue can be found by a wider community and so fixed earlier. Whereas with closed source, such as ASP.NET you're mostly reliant on the manufacturers to find them.
That's probably going to upset some people who love ASP.NET, but that's just my opinion.
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