I can see if I need help becoming anything of c # to vb.net is not understand how .. please help

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(typeof(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)
        {

        }
	}
}