List box1 to list box2 without duplication ?

Question

Hie Help me do it I want to use button's (i am willing to use 4 buttons i.e >  >>  Once check the attachment . attached image :) Thank you

Satyapriya Nayak · Answer

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 Move_items_from_one_listbox_other { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load(object sender EventArgs e) { listBox1.Items.Add(Raj); listBox1.Items.Add(Ravi); listBox1.Items.Add(Rahul); listBox1.Items.Add(Raju); listBox1.Items.Add(Rohit); listBox1.Items.Add(Rajesh); } private void button1_Click(object sender EventArgs e) { listBox2.Items.Add(listBox1.SelectedItem); int i = 0; i = listBox1.SelectedIndex; listBox1.Items.RemoveAt(i); } private void button2_Click(object sender EventArgs e) { listBox1.Items.Add(listBox2.SelectedItem); int i = 0; i = listBox2.SelectedIndex; listBox2.Items.RemoveAt(i); } private void button3_Click(object sender EventArgs e) { int j = 0; for (j = 0; j { listBox2.Items.Add(listBox1.Items[j]); } listBox1.Items.Clear(); } private void button4_Click(object sender EventArgs e) { int j = 0; for (j = 0; j { listBox1.Items.Add(listBox2.Items[j]); } listBox2.Items.Clear(); } } } Thanks If this post helps you mark it as answer

SUNIL GUTTA · Answer

Hi friend Thank you so so much for reply & helping me out :) very grateful to you Well in ur solution that is near perfect but you used FOR loop for all four button_event_proc which is not efficient as it can't handle Nulll values :) so please replace your code of button 3 & 4 with this type using foreach loop Button3_event_proc foreach (object item in listBox1.Items) { listBox2.Items.Add(item.ToString()); } Button4_evnt_proc foreach (object item in listBox2.Items) { listBox1.Items.Add(item.ToString()); } Thank you for reply once again Hey but still exceptions are getting due to no i/p selected i am working n for loops of 1&2 buttons for possible replacement with foreach again :) if possible so then solution will be apt :)