// Fig. 15.18: ListBoxTestForm.cs
// Program to add, remove and clear ListBox items
using System;
using System.Windows.Forms;

namespace ListBoxTest
{
   // Form uses a TextBox and Buttons to add,
   // remove, and clear ListBox items
   public partial class ListBoxTestForm : Form
   {
      // constructor
      public ListBoxTestForm()
      {
         InitializeComponent();
      } // end constructor

      // add new item to ListBox (text from input TextBox)
      // and clear input TextBox
      private void addButton_Click( object sender, EventArgs e )
      {
         displayListBox.Items.Add( inputTextBox.Text );
         inputTextBox.Clear();
      } // end method addButton_Click

      // remove item if one is selected
      private void removeButton_Click( object sender, EventArgs e )
      {
         // check whether item is selected; if so, remove
         if ( displayListBox.SelectedIndex != -1 )
            displayListBox.Items.RemoveAt( 
               displayListBox.SelectedIndex );
      } // end method removeButton_Click

      // clear all items in ListBox
      private void clearButton_Click( object sender, EventArgs e )
      {
         displayListBox.Items.Clear();
      } // end method clearButton_Click

      // exit application
      private void exitButton_Click( object sender, EventArgs e )
      {
         Application.Exit();
      } // end method exitButton_Click
   } // end class ListBoxTestForm
} // end namespace ListBoxTest

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