C# Override referenced method

I'm seeking to extend and existing method that I've referenced in my VS2008 project.  I'm trying to extend the NUnit "Assert.True(Boolean sample)" to incorporate custom reporting functionality.  Where can I find an example doing this?  I've looked on Google and cannot find any great tutorials on this topic.
Phil5780Asked:
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Kyle AbrahamsSenior .Net DeveloperCommented:
You would have to inherit the class and then override it.  Calling MyBase or base. as needed and adding other functionality.
Easwaran ParamasivamCommented:
You can create Extension method to existing class by creating a static method in a static class and passing this ClassName as first parameter. Please do refer http://msdn.microsoft.com/en-us/library/bb383977.aspx. Try to provide your own implementation this way. Otherwise Override the method and after the overriding the method do not forget to call base.Method()

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