RadioButton check state change event
using System;
using System.Drawing;
using System.Windows.Forms;
public class Test : Form {
private RadioButton square = new RadioButton();
private RadioButton circle = new RadioButton();
private ComboBox color = new ComboBox();
private Color c = Color.Red;
public Test( ) {
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 override void OnPaint(PaintEventArgs e){
Graphics g = e.Graphics;
Brush brush = new SolidBrush(c);
if (square.Checked)
g.FillRectangle(brush,100,100,100,100);
else
g.FillEllipse(brush,100,100,100,100);
base.OnPaint( e );
}
protected void Selected_Index(Object sender, EventArgs e){
if (color.SelectedItem.ToString() == "Red" )
c = Color.Red;
else if (color.SelectedItem.ToString() == "Green")
c = Color.Green;
else
c = Color.Blue;
Invalidate();
}
protected void Checked_Changed(Object sender, EventArgs e) {
Invalidate();
}
static void Main() {
Application.Run(new Test());
}
}
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