using System; using System.Drawing; using System.Windows.Forms; public class SelectItem : Form { private RadioButton square = new RadioButton(); private RadioButton circle = new RadioButton(); private ComboBox color = new ComboBox(); public SelectItem( ) { Text = "Select Item"; square.Text = "Square"; circle.Text = "Circle"; color.Text = "Choose a color"; Size = new Size(400,250); int w = 20; square.Location = new Point(w, 30); circle.Location = new Point(w += 10 + square.Width, 30); color.Location = new Point(w += 10 + circle.Width, 30); color.Items.Add("Red"); color.Items.Add("Green"); color.Items.Add("Blue"); Controls.Add(square); Controls.Add(circle); Controls.Add(color); square.CheckedChanged += new EventHandler(Checked_Changed); circle.CheckedChanged += new EventHandler(Checked_Changed); color.SelectedIndexChanged += new EventHandler(Selected_Index); } protected void Selected_Index(Object sender, EventArgs e) { if (color.SelectedItem.ToString() == "Red" ) Console.WriteLine("It is red."); else if (color.SelectedItem.ToString() == "Green") Console.WriteLine("It is green."); else Console.WriteLine("It is Blue"); } protected void Checked_Changed(Object sender, EventArgs e) { if (square.Checked) Console.WriteLine("It is rectangle"); else Console.WriteLine("Ellipse"); } static void Main() { Application.Run(new SelectItem()); } }