Consider the following C# code:

    static void CheckRedundantCast()
    {
        ulong number1 = 0xFFFFFFFFFFFFFFFFL;
        uint number2 = 0xFF;
        ulong myResult = number1 & ~(ulong)number2;

        Console.WriteLine(myResult.ToString("X16"));
    }

Here, VS 15.9 will show that the "(ulong)" cast before number2 is redundant. However, actually it's not redundant, because when you remove it, the output when running the program will change from:

FFFFFFFFFFFFFF00

to:

00000000FFFFFF00

Thanks!

This issue has been moved from https://developercommunity.visualstudio.com/content/problem/385829/vs-shows-cast-to-ulong-as-reduncant-when-its-not.html
VSTS ticketId: 731917
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