How do I set a Data Breakpoint in mixed( C#/C++ ) debugging?

Question

I launch my program in C#, which then calls some unmanaged C++.

When I break on a line in the unmanaged C++, the \'New Data Breakpoint\' menu item is grayed out.

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Answer 1

A very useful trick which works everywhere is to call breakpoints from code in special conditions:

If (Condition)
    System.Diagnostics.Debugger.Break()