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public static extern int NetServerGetInfo(

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Declare Function NetServerGetInfo Lib "netapi32.dll" (ByVal ServerName As String, _

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    lRetCode = NetServerGetInfo(vbNullString, 102, ptrBuff)

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private static extern int NetServerGetInfo(string serverName, int level, out IntPtr pSERVER_INFO_XXX);

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public static T NetServerGetInfo<T>(string serverName = null, int level = 0) where T : struct

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       int ret = NetServerGetInfo(serverName, level, out ptr);

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    var serverInfo = NetServerGetInfo<SERVER_INFO_101>("SVR0123");

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        if(NetServerGetInfo(domainInfo.DomainControllerName, 101, out pSI)==0)

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Documentation

[NetServerGetInfo] on MSDN