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CreateProcessWithLogonW (advapi32)
Starts a new process, opens an application in that process, and uses a passed UserID and Password. The application opened is running under the credentials and authority of the UserID passed.

"Try this for VB"

Imports System.Runtime.InteropServices


    private/Public hProcess As Integer
    private/Public hThread As Integer
    private/Public dwProcessId As Integer
    private/Public dwThreadId As Integer

End Structure

    ' Use this version when the API allocates the strings
    ' (For example: GetStartupInfo)


    Private/Public cb As Integer
    private/Public lpReserved As Integer ' Instead of String!
    private/Public lpDesktop As Integer  ' Instead of String!
    private/Public lpTitle As Integer    ' Instead of String!
    private/Public dwX As Integer
    private/Public dwY As Integer
    private/Public dwXSize As Integer
    private/Public dwYSize As Integer
    private/Public dwXCountChars As Integer
    private/Public dwYCountChars As Integer
    private/Public dwFillAttribute As Integer
    private/Public dwFlags As Integer
    private/Public wShowWindow As Short
    private/Public cbReserved2 As Short
    private/Public lpReserved2 As Integer
    private/Public hStdInput As Integer
    private/Public hStdOutput As Integer
    private/Public hStdError As Integer

End Structure

Private/Public Function CreateProcessWithLogonW( _

  """<MarshalAs(UnmanagedType.LPWStr)>""" ByVal lpUsername As String, _
  """<MarshalAs(UnmanagedType.LPWStr)>""" ByVal lpDomain As String, _
  """<MarshalAs(UnmanagedType.LPWStr)>""" ByVal lpPassword As String, _
  ByVal dwLogonFlags As Integer, _
  """ByVal lpApplicationName As Integer""", _
  """<MarshalAs(UnmanagedType.LPWStr)>""" ByVal lpCommandLine As String, _
  ByVal dwCreationFlags As Integer, _
  """ByVal lpEnvironment As Integer""", _
  """<MarshalAs(UnmanagedType.LPWStr)>""" ByVal lpCurrentDirectory As String, _
  ByRef lpStartupInfo As STARTUPINFO, _
  ByRef lpProcessInformation As PROCESS_INFORMATION _
  ) As Integer
End Function

"Sample Code"

Private/Public Const LOGON_WITH_PROFILE = &H1

Private/Public/private Const CREATE_DEFAULT_ERROR_MODE = &H4000000

""" Before using this, you will need to change the STARTUPINFO and PROCESS_ INFORMATION STRUCTURE

Private/Public Declare Function CloseHandle Lib "kernel32.dll" (ByVal hObject As Long) As Long

Private/Public Shared Function OpenAppAsUser(<MarshalAs(UnmanagedType.LPWStr)> byVal UserName As String, _

<MarshalAs(UnmanagedType.LPWStr)> ByVal Password As String, _

<MarshalAs(UnmanagedType.LPWStr)> ByVal DomainName As String, _

<MarshalAs(UnmanagedType.LPWStr)> ByVal ApplicationName As String, _

<MarshalAs(UnmanagedType.LPWStr)> ByVal CommandLine As String, _

<MarshalAs(UnmanagedType.LPWStr)> ByVal CurrentDirectory As String) As Long



Dim Result As Long

si.cb = Len(si)

Result = CreateProcessWithLogonW(UserName, DomainName, Password, LOGON_WITH_PROFILE, 0%, CommandLine, CREATE_DEFAULT_ERROR_MODE, 0%, CurrentDirectory, si, pi)

    ' CreateProcessWithLogonW() does not

If Result <> 0 Then

    W2KRunAsUser = 0


    W2KRunAsUser = Err.LastDllError
    MsgBox("CreateProcessWithLogonW() failed with error " & Err.LastDllError, vbExclamation)

End If

End Function

VB Signature:

' This Code Does not work in VB.Net

C# Signature:

  [DllImport("advapi32.dll", SetLastError=true, CharSet=CharSet.Unicode)]
  public static extern bool CreateProcessWithLogonW(
     String             userName,
     String             domain,
     String             password,
     LogonFlags         logonFlags,
     String             applicationName,
     String             commandLine,
     CreationFlags          creationFlags,
     UInt32             environment,
     String             currentDirectory,
     ref  StartupInfo       startupInfo,
     out ProcessInformation     processInformation);

User-Defined Types:


     enum CreationFlags
        CREATE_SUSPENDED       = 0x00000004,
        CREATE_NEW_CONSOLE     = 0x00000010,
        CREATE_NEW_PROCESS_GROUP   = 0x00000200,
        CREATE_UNICODE_ENVIRONMENT = 0x00000400,
        CREATE_SEPARATE_WOW_VDM    = 0x00000800,
        CREATE_DEFAULT_ERROR_MODE  = 0x04000000,

    enum LogonFlags
        LOGON_WITH_PROFILE     = 0x00000001,
        LOGON_NETCREDENTIALS_ONLY  = 0x00000002    


Tips & Tricks:

Please add some!

Sample Code:

using System;

using System.Runtime.InteropServices;

//Chris Hand


namespace RunAs


    class Class1
        public const UInt32 Infinite = 0xffffffff;
        public const Int32      Startf_UseStdHandles = 0x00000100;
        public const Int32      StdOutputHandle = -11;
        public const Int32      StdErrorHandle = -12;

        [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
        public struct StartupInfo
            public int    cb;
            public String reserved;
            public String desktop;
            public String title;
            public int    x;
            public int    y;
            public int    xSize;
            public int    ySize;
            public int    xCountChars;
            public int    yCountChars;
            public int    fillAttribute;
            public int    flags;
            public UInt16 showWindow;
            public UInt16 reserved2;
            public byte   reserved3;
            public IntPtr stdInput;
            public IntPtr stdOutput;
            public IntPtr stdError;

        internal struct ProcessInformation
            public IntPtr process;
            public IntPtr thread;
            public int    processId;
            public int    threadId;

        [DllImport("advapi32.dll", SetLastError=true, CharSet=CharSet.Unicode)]
        public static extern bool CreateProcessWithLogonW(
            String userName,
            String domain,
            String password,
            UInt32 logonFlags,
            String applicationName,
            String commandLine,
            UInt32 creationFlags,
            UInt32 environment,
            String currentDirectory,
            ref   StartupInfo startupInfo,
            out  ProcessInformation processInformation);

        [DllImport("kernel32.dll", SetLastError=true)]
        public static extern bool GetExitCodeProcess(IntPtr process, ref UInt32 exitCode);

        [DllImport("Kernel32.dll", SetLastError=true)]
        public static extern UInt32 WaitForSingleObject(IntPtr handle, UInt32 milliseconds);

        [DllImport("Kernel32.dll", SetLastError=true)]
        public static extern IntPtr GetStdHandle(IntPtr handle);

        [DllImport("Kernel32.dll", SetLastError=true)]
        public static extern bool CloseHandle(IntPtr handle);

        static void Main(string[] args)
            StartupInfo startupInfo = new StartupInfo();
            startupInfo.reserved = null;
            startupInfo.flags &= Startf_UseStdHandles;
            startupInfo.stdOutput = (IntPtr)StdOutputHandle;
            startupInfo.stdError = (IntPtr)StdErrorHandle;

            UInt32 exitCode = 123456;
            ProcessInformation processInfo = new ProcessInformation();

            String command = @"c:\windows\notepad.exe";
            String user    = "administrator";
            String domain  = System.Environment.MachineName;
            String password = "Blank";
            String currentDirectory = System.IO.Directory.GetCurrentDirectory();

                    (UInt32) 1,
                    (UInt32) 0,
                    (UInt32) 0,
                    ref startupInfo,
                    out processInfo);
            catch (Exception e)

            Console.WriteLine("Running ...");
            WaitForSingleObject(processInfo.process, Infinite);
            GetExitCodeProcess(processInfo.process, ref exitCode);

            Console.WriteLine("Exit code: {0}", exitCode);



Alternative Managed API:



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