Observer Pattern Code Review

class Interact : Form { public TextBox wall; public Button subscribeButton; public Button unSubscribeButton; public TextBox messageBox;
String name;
public Interact(String name, EventHandler Input) { Control.CheckForIllegalCrossThreadCalls = true;
this.name = name; wall = new TextBox(); wall.Multiline = true; wall.Location = new Point(0, 30); wall.Width = 300; wall.Height = 200; wall.AcceptsReturn = true; wall.Dock = DockStyle.Fill; this.Text = name; this.Controls.Add(wall);
Panel p = new Panel(); messageBox = new TextBox(); messageBox.Width = 120; p.Controls.Add(messageBox);
subscribeButton = new Button(); subscribeButton.Left = messageBox.Width; subscribeButton.Text = "Subscribe"; subscribeButton.Click += new EventHandler(Input); p.Controls.Add(subscribeButton);
unSubscribeButton = new Button(); unSubscribeButton.Left = messageBox.Width + subscribeButton.Width; unSubscribeButton.Text = "Unsubscribe"; unSubscribeButton.Click += new EventHandler(Input); p.Controls.Add(unSubscribeButton);
p.Height = subscribeButton.Height; p.Height = unSubscribeButton.Height; p.Dock = DockStyle.Top; this.Controls.Add(p); } public void Output(String message) { if (this.InvokeRequired) { this.Invoke((MethodInvoker)delegate() { Output(message); }); } else { wall.AppendText(String.Format("{0}\r\n", message)); this.Show(); } } }