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NetJoinDomain (netapi32)
 
.
Summary
The NetJoinDomain function joins a computer to a workgroup or domain.

C# Signature:

[DllImport("netapi32.dll"", CharSet=CharSet.Unicode)]
static extern int NetJoinDomain(
          string lpServer,
          string lpDomain,
          string lpAccountOU,
          string lpAccount,
          string lpPassword,
          int fJoinOptions);

VB Signature:

Declare Function NetJoinDomain Lib "netapi32.dll" (TODO) As TODO

User-Defined Types:

        [Flags]
        public enum JoinOptions
        {
          NETSETUP_JOIN_DOMAIN = 0x00000001,
          NETSETUP_ACCT_CREATE = 0x00000002,
          NETSETUP_ACCT_DELETE = 0x00000004,
          NETSETUP_WIN9X_UPGRADE = 0x00000010,
          NETSETUP_DOMAIN_JOIN_IF_JOINED = 0x00000020,
          NETSETUP_JOIN_UNSECURE = 0x00000040,
          NETSETUP_MACHINE_PWD_PASSED = 0x00000080,
          NETSETUP_DEFER_SPN_SET = 0x10000000
        }

Notes:

If the function succeeds, the return value is NERR_Success.

If the function fails, the return value can be one of the following error codes or one of the system error codes.

Return code Description:

ERROR_INVALID_PARAMETER
A parameter is incorrect.
ERROR_NO_SUCH_DOMAIN
The specified domain did not exist.
NERR_SetupAlreadyJoined
The computer is already joined to a domain.
NERR_InvalidWorkgroupName
The specified workgroup name is not valid.

Tips & Tricks:

To join a machine to a domain the same way that netdom.exe does, use the flags NETSETUP_JOIN_DOMAIN and NETSETUP_ACCT_CREATE. (I determined this by using a debugger to watch which flags netdom used.)

Sample Code:

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Documentation

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