A C# Server Drop-down Control

using System;
using System.Runtime.InteropServices;

namespace ServerDropDown
{
	public enum ServerTypeEnum : uint
	{
		None					= 0,
		ALL						= 0xFFFFFFFF,
		WORKSTATION          	= 0x00000001,
		SERVER               	= 0x00000002,
		SQLSERVER            	= 0x00000004,
		DOMAIN_CTRL          	= 0x00000008,
		DOMAIN_BAKCTRL       	= 0x00000010,
		TIME_SOURCE          	= 0x00000020,
		AFP                  	= 0x00000040,
		NOVELL               	= 0x00000080,
		DOMAIN_MEMBER        	= 0x00000100,
		PRINTQ_SERVER        	= 0x00000200,
		DIALIN_SERVER        	= 0x00000400,
		XENIX_SERVER         	= 0x00000800,
		NT                   	= 0x00001000,
		WFW                  	= 0x00002000,
		SERVER_MFPN          	= 0x00004000,
		SERVER_NT            	= 0x00008000,
		POTENTIAL_BROWSER    	= 0x00010000,
		BACKUP_BROWSER       	= 0x00020000,
		MASTER_BROWSER       	= 0x00040000,
		DOMAIN_MASTER        	= 0x00080000,
		SERVER_OSF           	= 0x00100000,
		SERVER_VMS           	= 0x00200000,
		WINDOWS              	= 0x00400000,  /* Windows95 and above */
		DFS                  	= 0x00800000,  /* Root of a DFS tree */
		CLUSTER_NT           	= 0x01000000,  /* NT Cluster */
		DCE                  	= 0x10000000,  /* IBM DSS (Directory and Security Services) or equivalent */
		ALTERNATE_XPORT      	= 0x20000000,  /* return list for alternate transport */
		LOCAL_LIST_ONLY      	= 0x40000000,  /* Return local list only */
		DOMAIN_ENUM          	= 0x80000000
	}

	public class ServerList
	{
		[DllImport("kernel32.dll")]
		private static extern uint CopyMemory ([MarshalAs(UnmanagedType.AsAny)] object Destination, 
			[MarshalAs(UnmanagedType.AsAny)] object Source,
			int Length);

		[DllImport("netapi32.dll")]
		unsafe private static extern uint NetServerEnum([MarshalAs(UnmanagedType.LPWStr)] string ServerName, 
			uint level,
			uint* bufptr,
			uint prefmaxlen,
			ref uint entriesread,
			ref uint totalentries,
			uint servertype,
			[MarshalAs(UnmanagedType.LPWStr)] string domain, 
			uint resume_handle);

		[System.Runtime.InteropServices.StructLayoutAttribute (LayoutKind.Sequential, CharSet=CharSet.Auto)]
		private struct SERVER_INFO_101 
		{ 
			public int dwPlatformID; 
			public System.IntPtr lpszServerName;
			public int dwVersionMajor; 
			public int dwVersionMinor; 
			public int dwType; 
			public int lpszComment;
		}

		private static ServerTypeEnum _serverType;

		public ServerList()
		{
		}

		public static ServerTypeEnum ServerType
		{
			get
			{
				return _serverType;
			}
			set
			{
				_serverType = value;
			}
		}

		public static string[] GetList(string domain)
		{
			string[] servers;
			string serverName = null;
			string domainName = null; 
			uint level = 101, prefmaxlen = 0xFFFFFFFF, entriesread = 0, totalentries = 0; 
			uint resume_handle = 0;
			
			try
			{
				unsafe
				{	
					//get a pointer to the server info structure
					SERVER_INFO_101* si = null;
					SERVER_INFO_101* pTmp;	//temp pointer for use when looping through returned (pointer) array

					//this api requires a pointer to a byte array...which is actually a pointer to an array
					//of SERVER_INFO_101 structures
					uint nRes = NetServerEnum(serverName, level, (uint *) &si, prefmaxlen, ref entriesread, ref totalentries, 
						(uint)_serverType, domainName, resume_handle);
			
					servers = new string[entriesread];

					if (nRes == 0)
					{
						if ((pTmp = si) != null)					//assign the temp pointer 
						{
							for (int i = 0; i < entriesread; i++)	//loop through the entries
							{
								try
								{
									servers[i] = Marshal.PtrToStringAuto(pTmp->lpszServerName);
								}
								catch (Exception e)
								{
									string error = e.Message;
								}
								pTmp++;		//increment the pointer...essentially move to the next structure in the array
							}
						}
					}
				}  
			}
			catch (Exception /*e*/)
			{
				return null;
			}

			return servers;
		}
	}
}