Application.StartupPath vs Application.StartupPath.ToString() in managed/unmanaged interaction

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C++

C#

DLL

unmanaged

I have a C# project that uses an dll function, via import, where the dll is created from an unmanaged c++ project.

[DllImport("sample.dll")]
int readPath(string somePath);

On the C++ side, the function definition is:

int readPath(wchar_t* somePath);

When I try to call the function from C# side and pass in Application.StartupPath... The following DOES NOT WORK!

readPath(Application.StartupPath);

On the C++ side I end up getting only the first CHAR of the path.

But by calling ToString(), I get the entire path string just fine.

readPath(Application.StartupPath.ToString());

Can someone explain why that's the case?

Thanks!