List all network computers

Make the following code as a NetworkBrowser.cs
using System;
using System.Runtime.InteropServices;
using System.Security;
using System.Collections;
using System.Windows.Forms;

namespace ListNetworkComputers
{
#region NetworkBrowser CLASS
public sealed class NetworkBrowser
{
#region Dll Imports

[DllImport("Netapi32", CharSet = CharSet.Auto, SetLastError = true),
SuppressUnmanagedCodeSecurityAttribute]

public static extern int NetServerEnum(
string ServerNane, // must be null
int dwLevel,
ref IntPtr pBuf,
int dwPrefMaxLen,
out int dwEntriesRead,
out int dwTotalEntries,
int dwServerType,
string domain, // null for login domain
out int dwResumeHandle
);

[DllImport("Netapi32", SetLastError = true),
SuppressUnmanagedCodeSecurityAttribute]

public static extern int NetApiBufferFree(
IntPtr pBuf);

[StructLayout(LayoutKind.Sequential)]
public struct _SERVER_INFO_100
{
internal int sv100_platform_id;
[MarshalAs(UnmanagedType.LPWStr)]
internal string sv100_name;
}
#endregion
#region Public Constructor

public NetworkBrowser()
{

}
#endregion
#region Public Methods

public ArrayList getNetworkComputers()
{
//local fields
ArrayList networkComputers = new ArrayList();
const int MAX_PREFERRED_LENGTH = -1;
int SV_TYPE_WORKSTATION = 1;
int SV_TYPE_SERVER = 2;
IntPtr buffer = IntPtr.Zero;
IntPtr tmpBuffer = IntPtr.Zero;
int entriesRead = 0;
int totalEntries = 0;
int resHandle = 0;
int sizeofINFO = Marshal.SizeOf(typeof(_SERVER_INFO_100));


try
{
int ret = NetServerEnum(null, 100, ref buffer, MAX_PREFERRED_LENGTH,
out entriesRead,
out totalEntries, SV_TYPE_WORKSTATION | SV_TYPE_SERVER, null, out
resHandle);
if (ret == 0)
{
for (int i = 0; i < totalEntries; i++)
{
tmpBuffer = new IntPtr((int)buffer + (i * sizeofINFO));
_SERVER_INFO_100 svrInfo = (_SERVER_INFO_100)
Marshal.PtrToStructure(tmpBuffer, typeof(_SERVER_INFO_100));
networkComputers.Add(svrInfo.sv100_name);
}
}
}
catch (Exception ex)
{
MessageBox.Show("Problem with acessing network computers in NetworkBrowser " +
"\r\n\r\n\r\n" + ex.Message,
"Error", MessageBoxButtons.OK,
MessageBoxIcon.Error);
return null;
}
finally
{
NetApiBufferFree(buffer);
}
return networkComputers;

}
#endregion
}
#endregion
}


In the form add the combo box and put the name cmbNetworkComputers
In the form load add the following code

try
{
NetworkBrowser nb = new NetworkBrowser();
foreach (string pc in nb.getNetworkComputers())
{
cmbNetworkComputers.Items.Add(pc);

}
}
catch (Exception ex) {
MessageBox.Show("An error occurred trying to access the network computers", "error",
MessageBoxButtons.OK, MessageBoxIcon.Error);
Application.Exit();
}

OUTPUT: