What should you do when two interfaces with the same name are encountered in a project?

If two interfaces with the same name are encountered in a project, the conflict can be resolved in several ways:

1. Use namespaces through namespace or assembly namespace. In C#, this is usually achieved using namespaces. For example:

namespace ProjectA {
    interface ILogger { void Log(string message); }
}

namespace ProjectB {
    interface ILogger { void Log(string message); }
}

// Usage:
ProjectA.ILogger loggerA;
ProjectB.ILogger loggerB;

2. Use the using directive with aliases:

using LoggerA = ProjectA.ILogger;
using LoggerB = ProjectB.ILogger;

LoggerA loggerA;
LoggerB loggerB;

3. Rename one of the interfaces if possible to avoid confusion.

Thus, the key solution is to explicitly specify the namespace so that the compiler understands which interface is being used.