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9 Feb 2013

Copy Selected Values of a MultiSelect ListBox to TextBox in C#

In this post we will see a simple example with listbox . Here we will see how to add values to listbox at runtime . And Multi Select Property of ListBox. And how to copy selected values of listbox to textbox. For this i am designing a form with a ListBox and 3 Textboxes as shown in image below.

Listbox_to_Textbox



 Now the c# code is like this:

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 listbox2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
           listBox1.SelectionMode=SelectionMode.MultiSimple;
            listBox1.Items.Add("AAAAAA");
            listBox1.Items.Add("BBBBBB");
            listBox1.Items.Add("CCCCCC");
            listBox1.Items.Add("DDDDDD");
            listBox1.Items.Add("EEEEEE");
            listBox1.Items.Add("FFFFFF");
            listBox1.Items.Add("GGGGGG");
            listBox1.Items.Add("HHHHHH");
            listBox1.Items.Add("IIIIII");
            listBox1.Items.Add("JJJJJJ");
        }

        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {

            try
            {
                int i = listBox1.SelectedItems.Count;

                    if (i == 1)
                    {

                        txtbox1.Text = listBox1.SelectedItems[0].ToString();
                    }
                    if (i == 2)
                    {

                        txtbox2.Text = listBox1.SelectedItems[1].ToString();
                    }
                 if (i == 3)
                 {

                     txtbox3.Text = listBox1.SelectedItems[2].ToString();
                 }
                 if (i > 3)
                 {

                     listBox1.Enabled = false;
                     throw new Exception();
                 }
            }
            catch (Exception ex) { MessageBox.Show("cannot select more than 3"); }
        }
        private void btnclear_Click(object sender, EventArgs e)
        {
            Application.Restart();
        }
    }
}


I have written the code such that, the first selected item in a listbox will be copied to txtbox1 , second selected item will be copied to txtbox2 , third selected item will be copied to txtbox3.

See the image below

Listbox_to_Textbox_2


Download Sample Code : ListBox2.rar .