I'm trying to import a native DLL (written in C) in my C# project in visual studio. I've tried several ways but still get the same expeption (System.DllNotFoundException).

I've tried to import as follows:

#region P/Invoke

[DllImport("GetRotate.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]
private static extern IntPtr GetRotoTranslateImage([MarshalAsAttribute(UnmanagedType.LPStr)] String path, int x, int y, int translationX, int translationY, float rotAngle);

#endregion // P/Invoke

What's wrong? Why it is not able to find the dll?

Thanks in advance.