Use buttons to slide a ListBox's selection up or down in C#.NET

This example shows how to use buttons to slide a ListBox's selection up or down in C# .NET.

Keywords: ListBox, select, selection, SelectedItem, SelectedIndex, SetSelected, C#.NET,Csharp.NET

To slide the selection up, see if the SelectedIndex property is greater than 0. If it is, subtract 1 from it. 

To slide the selection down, see if the SelectedIndex property is less than the second largest item index. If it is, add 1 to it. 

Here the complete Code.

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace testc

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void Form1_Load(object sender,

            EventArgs e)

        {

         

        }

        private void button1_Click(object sender,

            EventArgs e)

        {

          

            if (listBox1 .SelectedIndex > 0)

                listBox1.SelectedIndex -= 1;

        }

        private void button2_Click(object sender,

            EventArgs e)

        {

            if (listBox1.SelectedIndex < listBox1.Items.Count - 1)

                listBox1.SelectedIndex += 1;

        }   

    }

}