How to get the currently active instance of Visual Studio Development Environment

From another post on this site, I got the attached code snippet. The problem with this code is that it retrieves the first instance of Visual Studio that it finds. If multiple instances of VS are running, it may not correctly return the current instance. Does anyone know how to make sure that I retrieve the current instance and not just the first one it finds?Start Free Trial

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EnvDTE.DTE dte = (EnvDTE.DTE)System.Runtime.InteropServices.Marshal.GetActiveObject("VisualStudio.DTE");