ListBox Selection Mode : ListBox « GUI Windows Forms « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. GUI Windows Forms
3. ListBox

using System;
using System.Drawing;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;

public class ListBoxSelectionMode : Form
{
  ListBox lb;
  RadioButton rdoMultiExtended;
  RadioButton rdoMultiSimple;
  RadioButton rdoMultiOne;
  TextBox txtTop;
  Button btnTop;

  public ListBoxSelectionMode()
  {
    int xSize, ySize;

    Size = new Size(300,400);

    lb = new ListBox();
    lb.Parent = this;
    lb.Location = new Point(10,10);
    lb.Size = new Size(ClientSize.Width - 20, Height - 200);
    lb.Anchor = AnchorStyles.Top | AnchorStyles.Left | AnchorStyles.Right | AnchorStyles.Bottom;
    lb.BorderStyle = BorderStyle.Fixed3D;
    lb.MultiColumn = true;
    lb.ScrollAlwaysVisible = true;

    GroupBox grpMulti = new GroupBox();
    grpMulti.Parent = this;
    grpMulti.Text = "MultiSelect";
    grpMulti.Location = new Point(lb.Left, lb.Bottom + 25);
    grpMulti.Anchor = AnchorStyles.Left | AnchorStyles.Bottom;

    rdoMultiOne = new RadioButton();
    rdoMultiOne.Parent = grpMulti;
    rdoMultiOne.Text = "One";
    rdoMultiOne.Tag = SelectionMode.One;
    rdoMultiOne.Checked = true;
    rdoMultiOne.Location = new Point(10,15);
    rdoMultiOne.CheckedChanged += new System.EventHandler(rdoMulti_CheckedChanged);

    rdoMultiSimple = new RadioButton();
    rdoMultiSimple.Parent = grpMulti;
    rdoMultiSimple.Text = "Multi-Simple";
    rdoMultiSimple.Tag = SelectionMode.MultiSimple;
    rdoMultiSimple.Location = new Point(10, rdoMultiOne.Bottom);
    rdoMultiSimple.CheckedChanged += new System.EventHandler(rdoMulti_CheckedChanged);

    rdoMultiExtended = new RadioButton();
    rdoMultiExtended.Parent = grpMulti;
    rdoMultiExtended.Text = "Multi-Extended";
    rdoMultiExtended.Tag = SelectionMode.MultiExtended;
    rdoMultiExtended.Location = new Point(10, rdoMultiSimple.Bottom);
    rdoMultiExtended.CheckedChanged += new System.EventHandler(rdoMulti_CheckedChanged);

    xSize = (int)(Font.Height * .75) * rdoMultiExtended.Text.Length;
    ySize = ((int)rdoMultiOne.Height * 3) + 20;
    grpMulti.Size = new Size(xSize, ySize);

    Panel pnlTop = new Panel();
    pnlTop.Parent = this;
    pnlTop.Location = new Point(lb.Left, grpMulti.Bottom + 10);
    pnlTop.Anchor = AnchorStyles.Left | AnchorStyles.Bottom;

    Label lblTop = new Label();
    lblTop.Parent = pnlTop;
    lblTop.Text = "TopIndex: ";
    xSize = ((int)(Font.Height * .5) * lblTop.Text.Length);
    lblTop.Size = new Size(xSize, Font.Height + 10);

    txtTop = new TextBox();
    txtTop.Parent = pnlTop;
    txtTop.Location = new Point(lblTop.Right, lblTop.Top);
    txtTop.Text = lb.TopIndex.ToString();
    txtTop.Size = new Size((int)(Font.Height * .75) * 3, 
                Font.Height + 10);

    btnTop = new Button();
    btnTop.Parent = pnlTop;
    btnTop.Text = "Update";
    btnTop.Location = new Point(txtTop.Right + 10, txtTop.Top);
    btnTop.Click += new System.EventHandler(btnTop_Click);


    lb.Items.Add("12345");
      lb.Items.Add("67890");      
      lb.Items.Add("7890");      
      lb.Items.Add("890");            
  } 

  static void Main() 
  {
    Application.Run(new ListBoxSelectionMode());
  }

  private void rdoMulti_CheckedChanged(object sender, EventArgs e)
  {
    RadioButton rdo = (RadioButton)sender;
    lb.SelectionMode = (SelectionMode)rdo.Tag;
  }

  private void btnTop_Click(object sender, EventArgs e)
  {
    txtTop.Text = lb.TopIndex.ToString();
  }
}

23.27.ListBox
	23.27.1.	Set the TopIndex property of the ListBox to ensure the most recently added items are visible
	23.27.2.	Add Items to ListBox
	23.27.3.	Add ContextMenu to ListBox
	23.27.4.	ListBox Items Add
	23.27.5.	ListBox Items Add a Range
	23.27.6.	ListBox Selection Mode
	23.27.7.	Use RadioButton to control ListBox selection mode
	23.27.8.	ListBox Events: SelectedIndexChanged, SelectedValueChanged, DataSourceChanged, DisplayMemberChanged, ValueMemberChanged
	23.27.9.	Add text in the TextBox to the ListBox
	23.27.10.	Fills a ListBox with data from Database