How to: Create Radio Group and Respond to Value Selection

• Oct 25, 2019
• 2 minutes to read

This example demonstrates how to programmatically create a radio group, add two items to the collection, initialize their properties and assign a handler to the RadioGroup.SelectedIndexChanged event. The created radio group will be used to control the visibility of a standard button control. This example assumes that a button has already been placed on the form.

The image below shows the example application.

C#

using DevExpress.Utils;
using DevExpress.XtraEditors;
using DevExpress.XtraEditors.Repository;
using DevExpress.XtraEditors.Controls;

private void CreateRadioEditors() {
    // creating and initializing the radio group items
    RadioGroupItem item1 = new RadioGroupItem();
    item1.Description = "Hide Button";
    RadioGroupItem item2 = new RadioGroupItem();
    item2.Description = "Show Button";
    // creating and initializing the radio group editor
    RadioGroup radioEdit1 = new RadioGroup();
    radioEdit1.Properties.Items.Add(item1);
    radioEdit1.Properties.Items.Add(item2);
    radioEdit1.Name = "radioEdit1";
    radioEdit1.Location = new System.Drawing.Point(30, 35);
    radioEdit1.Width = 100;
    radioEdit1.Height = 100;
    // setting the editor's selection depending upon the button's visibility
    if (button1.Visible) radioEdit1.SelectedIndex = 1;
    // assigning a handler for the SelectedIndexChanged event of the editor
    radioEdit1.SelectedIndexChanged += new EventHandler(SelectedIndexChanged);
    this.Controls.Add((Control)radioEdit1);
}

private void SelectedIndexChanged(object sender, System.EventArgs e) {
    RadioGroup edit = sender as RadioGroup;
    if (edit.SelectedIndex == 0) button1.Visible = false;
    else button1.Visible = true;
}

VB.NET

Imports DevExpress.XtraEditors.Repository
Imports DevExpress.XtraEditors.Controls
Imports DevExpress.XtraEditors
Imports DevExpress.Utils

Private Sub CreateRadioEditors()
   ' creating and initializing the radio group items
   Dim Item1 As New RadioGroupItem
   Item1.Description = "Hide Button"
   Dim item2 As New RadioGroupItem
   Item2.Description = "Show Button"
   ' creating and initializing the radio group editor
   Dim RadioEdit1 As New RadioGroup
   RadioEdit1.Properties.Items.Add(Item1)
   RadioEdit1.Properties.Items.Add(Item2)
   RadioEdit1.Name = "radioEdit1"
   RadioEdit1.Location = New System.Drawing.Point(30, 35)
   RadioEdit1.Width = 100
   RadioEdit1.Height = 100
   ' setting the editor's selection depending upon the button's visibility
   If Button1.Visible Then RadioEdit1.SelectedIndex = 1
   ' assigning a handler for the SelectedIndexChanged event of the editor
   AddHandler RadioEdit1.SelectedIndexChanged, AddressOf SelectedIndexChanged
   Me.Controls.Add(CType(RadioEdit1, Control))
End Sub

Private Sub SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs)
   Dim Edit As RadioGroup = CType(sender, RadioGroup)
   If (Edit.SelectedIndex = 0) Then
      Button1.Visible = False
   Else : Button1.Visible = True
   End If
End Sub