C# Signature:

[DllImport("NetApi32.dll", CharSet=CharSet.Auto, SetLastError=true)]
private static extern Int32 NetLocalGroupAddMembers(
    string servername, //server name
    string groupname, //group name
    UInt32 level, //info level
    ref LOCALGROUP_MEMBERS_INFO_3 buf, //Group info structure
    UInt32 totalentries //number of entries
    );

VB Signature:

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

User-Defined Types:

None.

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

using System;

using System.Text;

using System.Runtime.InteropServices;

namespace ConsoleApplication3

{

    class Program
    {
    [DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    static extern bool LookupAccountSid(
        string SystemName,
        [MarshalAs(UnmanagedType.LPArray)] byte[] Sid,
        StringBuilder Name,
        ref uint NameCount,
        StringBuilder ReferencedDomainName,
        ref uint ReferencedDomainNameCount,
        out SID_NAME_USE SIDUse);

    [DllImport("netapi32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
    extern static int NetLocalGroupAddMembers(string ServerName, string LocalGroupName,
        uint Level, ref LOCALGROUP_MEMBERS_INFO_3 MemberInfo, uint TotalEntries);

    struct LOCALGROUP_MEMBERS_INFO_3
    {
        [MarshalAs(UnmanagedType.LPWStr)]
        public string Domain;
    }

    enum SID_NAME_USE
    {
        SidTypeUser = 1,
        SidTypeGroup,
        SidTypeDomain,
        SidTypeAlias,
        SidTypeWellKnownGroup,
        SidTypeDeletedAccount,
        SidTypeInvalid,
        SidTypeUnknown,
        SidTypeComputer
    }

    static void Main(string[] args)
    {
        MakeUserAdmin(@"GEDEV\Engineer_1");
    }

    static bool MakeUserAdmin(string UserName)
    {
        bool bOk = false;

        StringBuilder sbName = new StringBuilder();
        uint uiName = (uint)sbName.Capacity;
        StringBuilder sbReferencedDomainName = new StringBuilder();
        uint uiReferencedDomainNameCount = (uint)sbReferencedDomainName.Capacity;
        SID_NAME_USE eUse;
        // Sid for BUILTIN\Administrators
        byte[] baSid = new byte[] { 1, 2, 0, 0, 0, 0, 0, 5, 32, 0, 0, 0, 32, 2 };

        if (!LookupAccountSid(null, baSid, sbName, ref uiName, sbReferencedDomainName, ref uiReferencedDomainNameCount, out eUse))
        return bOk;

        // prepare user name
        LOCALGROUP_MEMBERS_INFO_3 info;
        info.Domain = UserName;

        int iRetVal = 0;

        // add the user to the administrators group
        if ((iRetVal = NetLocalGroupAddMembers(null, sbName.ToString(), 3, ref info, 1)) != 0)
        return bOk;

        bOk = true;

        return bOk;
    }
    }

}

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