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private static extern Int32 NetLocalGroupAddMembers(

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

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    extern static int NetLocalGroupAddMembers(string ServerName, string LocalGroupName,

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    //Error codes associated with 'NetLocalGroupAddMembers'

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        if ((iRetVal = NetLocalGroupAddMembers(null, sbName.ToString(), 3, ref info, 1)) != 0)

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            var result = NetLocalGroupAddMembers(null, groupName, 0, ref info3, 1);

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Documentation

[NetLocalGroupAddMembers] on MSDN