C#

if (picturebox1.Image == Properties.Resource.Pic1)
   {
   ... Move to picture two
   }

using System;
using System.Runtime.InteropServices;
internal class DynamicLoad {
  [DllImport("kernel32.dll", SetLastError = true)]
  private static extern IntPtr LoadLibrary(String dllToLoad);

  [DllImport("kernel32", CharSet = CharSet.Ansi, ExactSpelling = true, SetLastError = true)]
  private static extern IntPtr GetProcAddress(IntPtr hModule, string procName);

  [DllImport("kernel32.dll", SetLastError = true)]
  private static extern bool FreeLibrary(IntPtr hModule);
  
  // Assuming CharSet.Ansi, you may be Unicode.
  [UnmanagedFunctionPointer(CallingConvention.StdCall, SetLastError = false, CharSet = CharSet.Ansi)]
  internal delegate int SomeFunction(string Param1);

  private IntPtr dllPtr;
  internal SomeFunction someFunction;

  internal Boolean Load(String dllPath) {
    dllPtr = LoadLibrary(dllPath);
    // Int32 code = Marshal.GetLastWin32Error();
    // TODO: error handling
    if (dllPtr != IntPtr.Zero) {
      try {
        someFunction = (SomeFunction)Marshal.GetDelegateForFunctionPointer(
          GetProcAddress(dllPtr, "SomeFunction"),
          typeof(SomeFunction));
      } catch (ArgumentNullException) {
        // SomeFunction was not found
        Unload();
      }
    }
    return (dllPtr != IntPtr.Zero);
  }

  internal void Unload() {
    bool result = FreeLibrary(dllPtr);
    // TODO: error handling
    dllPtr = IntPtr.Zero;
  }
}

lukasz_nowakowski wrote:

Man, you're writing in your question, that this is WinForms question, so why don't you ask it on WinForms forum?