DllCall module32first (kernel32)

I am using C# + Silk4NET. I need to get remote machine process information with using module32first method.

How it should be declared? I've tried to declare it as follow:

[Dll("kernel32.dll")]
public interfaces IKernel32Functions
{

     Int64 CreateToolhelp32Snapshot(int dwFlags, int th32ProcessID);
     int Module32First(long hSnapshot, ref API.ApiFunc.MODULEENTRY32 lpme);
}

[StructLayout(LayoutKind.Sequential, CharSet = System.Runtime.InteropServices.CharSet.Auto)]
public struct MODULEENTRY32
{
   public uint dwSize;
   public uint th32ModuleID;
   public uint th32ProcessID;
   public uint GlblcntUsage;
   public uint ProccntUsage;
   public long modBaseAddr;
   public uint modBaseSize;
   public long hModule;
   [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
   public string szModule;
   [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
   public string szExePath;
}

I call it as follow:

IKernel32Functions kernel32Caller = DllCall.CreateAgentDllCall<IKernel32Functions>();
long snapshot = kernel32Caller.CreateToolhelp32Snapshot(0x00000008, 5792);
ApiFunc.MODULEENTRY32 me32 = new ApiFunc.MODULEENTRY32();
int result = kernel32Caller.Module32First(snapshot, ref me32);

And get "Cannot serialize MODULEENTRY32". I tried to use ArrayList instead of MODULEENTRY32 struct and IntPtr, but I could not get anything.

How Module32First() method should be declared and what type should be used for getting MODULEENTRY32 instance ?