If you know DLL name but, don't know path on design-time you can use LoadLibrary

using System;
using System.Runtime.InteropServices;
namespace YogaGeneration.Win32
{
   public class Kernel32
   {
       [DllImport("kernel32")]
       public extern static IntPtr LoadLibrary(string lpLibFileName);
     
        [DllImport("kernel32")]
       public extern static Int32 FreeLibrary(IntPtr hModule);
   }
}

Now, you can use DLLImport without path, just call LoadLibrary before try to call any exported functions.

 [DllImport("MYDLL.dll", CharSet=CharSet.Auto, SetLastError=true)]
 protected static extern Int32 MyFun(IntPtr context );

(Type your message here)
How can I dynamically load a unmanaged dll in C#. Is it using DllImport? As in VC, can I use the LoadLibrary() directly?

I have an unmanaged C++ DLL which exports certain classes. I want to access these classes from the C# client. I was able to do so by modifying the DLL source to export class creation and destruction functions. Is this the only option for the problem? If I don't have the source code for the DLL, but just the .dll file, how can i access the exported methods from the dll, in C# client?

Also, I have read somewhere about writing a Wrapper class for the DLL, in C#. Is it possible to write the wrapper in C#? Is there any link which will help me in this?

In my c# client , for DllImport, i have given the callingConvention as 'CallingConvention.ThisCall'. One of my exported function has a callBackFunction as argument. I declared a delegate to take care of this. But when executed, the application gives an error of "different calling convention used". If I change the CallingConvention to 'StdCall' or 'cdecl', there is no error, but then the call back function is not called.

[DllImport("ediImgReader - Debug.dll", EntryPoint ="?mapImage@Cedi9660Reader@@QAE_NGP6A_NIPAE_N@Z@Z",CallingConventionÊllingConvention.ThisCall  )]

private static extern System.Int32 mapImage(IntPtr inst,System.UInt16 SectorSize, ReadSectorDelegate CallbackFunctionAddress);

public delegate System.Int32  ReadSectorDelegate(System.UInt32 SectorToBeRead,System.Byte SetToSectorDataIsLiteral, System.Int32 IsLiteral);

public static System.Int32 ReadSector(System.UInt32 SectorToBeRead,System.Byte SetToSectorDataIsLiteral, System.Int32 IsLiteral)
{
   MessageBox.Show("Inside Delegate");
   return 1;
}

public static  System.Int32 mapImage(System.UInt16 SectorSize, ReadSectorDelegate CallbackFunctionAddress)
{
    mapImage(Instance.inst,SectorSize,CallbackFunctionAddress);
    return 1;
}

Kindly help.

Thanks..