You can also use the WNetAddConnection2 and WNetAddConnection3 functions to redirect a local device to a network resource. Connections added by NetUseAdd are not shown in the Explorer. You should use one of the WNetAddConnection methods to make the networkdrive visible in the explorer.

http://www.pinvoke.net/default.aspx/Structures.USE_INFO_2

C# Signature:

using BOOL = System.Boolean;
using DWORD = System.UInt32;
using LPWSTR = System.String;
using NET_API_STATUS = System.UInt32;

[DllImport("NetApi32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
internal static extern NET_API_STATUS NetUseAdd(
     LPWSTR UncServerName,
     DWORD Level,
     ref Structures.USE_INFO_2 Buf,
     out DWORD ParmError);

User-Defined Types:

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
internal struct USE_INFO_2
{
     internal LPWSTR ui2_local;
     internal LPWSTR ui2_remote;
     internal LPWSTR ui2_password;
     internal DWORD  ui2_status;
     internal DWORD  ui2_asg_type;
     internal DWORD  ui2_refcount;
     internal DWORD  ui2_usecount;
     internal LPWSTR ui2_username;
     internal LPWSTR ui2_domainname;
}

Notes:

These structures are declared using C# ability to alias types with the using statement.

Tips & Tricks:

You need to declare the Struct in a separate code file called Structures, and then reference it in your main code instance. Otherwise the code will not work.

Also, you will need to add the following using statements to it:

using System.Runtime.InteropServices;

using BOOL = System.Boolean;

using DWORD = System.UInt32;

using LPWSTR = System.String;

using NET_API_STATUS = System.UInt32;

Sample Code:

USE_INFO_2 useInfo    = new USE_INFO_2();
useInfo.ui2_local     = "E:";
useInfo.ui2_remote    = @"\\machine\share";
useInfo.ui2_password  = "password";
useInfo.ui2_asg_type  = 0;    //disk drive
useInfo.ui2_usecount  = 1;
useInfo.ui2_username  = "user";
useInfo.ui2_domainname= "domain";

uint paramErrorIndex;
uint returnCode = NetUseAdd(null, 2, ref useInfo, out paramErrorIndex);
if (returnCode != 0)
{
      throw new Win32Exception((int)returnCode);
}

Alternative Managed API:

TODO