como puedo cambiar este codigo a vb.net

[sagredo_azul]

este es un codigo que encontre por ahi para ver quienes estan conectados al mismo grupo de red...

namespace HostNIPAddr
{

public class MOSTRAR : System.Windows.Forms.Form
{
internal System.Windows.Forms.Button txtcerrar
internal System.Windows.Forms.Button txtmostrar
internal System.Windows.Forms.ListView ListaPcIp
internal System.Windows.Forms.ColumnHeader NombrePc
internal System.Windows.Forms.ColumnHeader DireccionIp
internal System.Windows.Forms.StatusBar ESTADO;
private System.Windows.Forms.TextBox TxtGrupoTrabajo
private System.Windows.Forms.Label txtlabel1
private System.Windows.Forms.ColumnHeader DireccionMac

[DllImport("iphlpapi.dll", ExactSpelling=true)]
public static extern int SendARP( int DestIP, int SrcIP, [Out] byte[] pMacAddr, ref int PhyAddrLen )


/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;

Public MOSTRAR()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();

//
// TODO: Add any constructor code after InitializeComponent call
//
}


protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typ eof(MOSTRAR));
this.txtcerrar = new System.Windows.Forms.Button();
this.txtmostrar = new System.Windows.Forms.Button();
this.ListaPcIp = new System.Windows.Forms.ListView();
this.NombrePc = new System.Windows.Forms.ColumnHeader();
this.DireccionIp = new System.Windows.Forms.ColumnHeader();
this.DireccionMac = new System.Windows.Forms.ColumnHeader();
this.ESTADO = new System.Windows.Forms.StatusBar();
this.TxtGrupoTrabajo = new System.Windows.Forms.TextBox();
this.txtlabel1 = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// txtcerrar
//
this.txtcerrar.Location = new System.Drawing.Point(361, 203);
this.txtcerrar.Name = "txtcerrar";
this.txtcerrar.Size = new System.Drawing.Size(84, 20);
this.txtcerrar.TabIndex = 7;
this.txtcerrar.Text = "Cerrar";
this.txtcerrar.Click += new System.EventHandler(this.ButClose_Click);
//
// txtmostrar
//
this.txtmostrar.Location = new System.Drawing.Point(361, 183);
this.txtmostrar.Name = "txtmostrar";
this.txtmostrar.Size = new System.Drawing.Size(84, 20);
this.txtmostrar.TabIndex = 6;
this.txtmostrar.Text = "Mostrar";
this.txtmostrar.Click += new System.EventHandler(this.ButDisplay_Click);
//
// ListaPcIp
//
this.ListaPcIp.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
this.NombrePc,
this.DireccionIp,
this.DireccionMac});
this.ListaPcIp.Location = new System.Drawing.Point(16, 7);
this.ListaPcIp.Name = "ListaPcIp";
this.ListaPcIp.Size = new System.Drawing.Size(304, 272);
this.ListaPcIp.TabIndex = 5;
this.ListaPcIp.UseCompatibleStateImageBehavior = false;
this.ListaPcIp.View = System.Windows.Forms.View.Details;
//
// NombrePc
//
this.NombrePc.Text = "Nombre Pc";
this.NombrePc.Width = 100;
//
// DireccionIp
//
this.DireccionIp.Text = "Direccion IP";
this.DireccionIp.Width = 100;
//
// DireccionMac
//
this.DireccionMac.Text = "Direccion Mac";
this.DireccionMac.Width = 125;
//
// ESTADO
//
this.ESTADO.Location = new System.Drawing.Point(0, 430);
this.ESTADO.Name = "ESTADO";
this.ESTADO.Size = new System.Drawing.Size(484, 32);
this.ESTADO.TabIndex = 4;
//
// TxtGrupoTrabajo
//
this.TxtGrupoTrabajo.Location = new System.Drawing.Point(361, 111);
this.TxtGrupoTrabajo.Name = "TxtGrupoTrabajo";
this.TxtGrupoTrabajo.Size = new System.Drawing.Size(80, 20);
this.TxtGrupoTrabajo.TabIndex = 8;
this.TxtGrupoTrabajo.Text = "Inacap";
//
// txtlabel1
//
this.txtlabel1.AutoSize = true;
this.txtlabel1.Location = new System.Drawing.Point(358, 86);
this.txtlabel1.Name = "txtlabel1";
this.txtlabel1.Size = new System.Drawing.Size(92, 13);
this.txtlabel1.TabIndex = 9;
this.txtlabel1.Text = "Grupo De Trabajo";
//
// MOSTRAR
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(484, 462);
this.Controls.Add(this.txtlabel1);
this.Controls.Add(this.TxtGrupoTrabajo);
this.Controls.Add(this.txtcerrar);
this.Controls.Add(this.txtmostrar);
this.Controls.Add(this.ListaPcIp);
this.Controls.Add(this.ESTADO);
this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this. Icon")));
this.MaximumSize = new System.Drawing.Size(500, 500);
this.MinimumSize = new System.Drawing.Size(500, 500);
this.Name = "MOSTRAR";
this.Text = "PC CONECTADOS";
this.Load += new System.EventHandler(this.MOSTRAR_Load);
this.ResumeLayout(false);
this.PerformLayout();

}
#endregion

/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new MOSTRAR());
}

private void ButDisplay_Click(object sender, System.EventArgs e)
{
try
{

this.ESTADO.Text = "Collecting Information...";

if(this.TxtGrupoTrabajo.Text.Trim() == "")
{
MessageBox.Show("The Work Group name Should Not be Empty");
return;
}


// Use Your work Group WinNT://&&&&(Work Group Name)
DirectoryEntry DomainEntry = new DirectoryEntry("WinNT://" + this.TxtGrupoTrabajo.Text.Trim());
DomainEntry.Children.SchemaFilter.Add("computer");


// To Get all the System names And Display with the Ip Address
foreach(DirectoryEntry machine in DomainEntry.Children)
{
string[] Ipaddr = new string[3];
Ipaddr[0] = machine.Name;

System.Net.IPHostEntry Tempaddr = null;

try
{
Tempaddr = (System.Net.IPHostEntry)Dns.GetHostByName(machine. Name);
}
catch(Exception ex)
{
MessageBox.Show("Unable to connect woth the system :" + machine.Name );
continue;
}
System.Net.IPAddress[] TempAd = Tempaddr.AddressList;
foreach(IPAddress TempA in TempAd)
{
Ipaddr[1] = TempA.ToString();

byte[] ab = new byte[6];
int len = ab.Length;

// This Function Used to Get The Physical Address
int r = SendARP( (int) TempA.Address, 0, ab, ref len );
string mac = BitConverter.ToString( ab, 0, 6 );

Ipaddr[2] = mac;
}

System.Windows.Forms.ListViewItem TempItem = new ListViewItem(Ipaddr);

this.ListaPcIp.Items.Add(TempItem);
}

this.ESTADO.Text = "CONECTADOS"
}
catch(Exception ex)
{
MessageBox.Show(ex.Message,"Error",System.Windows. Forms.MessageBoxButtons.OK );
Application.Exit();
}

}

private void ButClose_Click(object sender, System.EventArgs e)
{
this.Close();
}

private void MOSTRAR_Load(object sender, EventArgs e)
{

}
}
}