Listbox control in C#
Working with listbox control:
Listbox allows to choose more than one items also optionally.
Properties for listbox:
1)selecteditems
2)selectedindices
3)selectionmode:one/none/multisimple/multiextended
In multiextended, cntrl (or) shiftkeys need to be holded down for multiple selection, in case of multisimple, cntrl (or) shift keys are not required
Example on listbox:
Open windows forms application project:
Start->programs->Microsoft visual studio 2010->Microsoft Visual studio 2010->file menu->new->
project->select visual c# from installed templates->select windows forms application project
place a listbox with selection mode=multiextended
place a button
place one more listbox
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 WindowsFormsApplication8
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
string[] x = { "java", "c#", "c", "c++", "asp", "sap", "jsp" };
//logic 1 for adding above values in listbox1
for (int i = 0; i < x.Length; i++)
listBox1.Items.Add(x[i]);
//logic2
listBox1.DataSource = x;
}
private void button1_Click(object sender, EventArgs e)
{
//ienumarator is a predefined interface, which is the part of system.collections name space
System.Collections.IEnumerator ie;
ie = listBox1.SelectedItems.GetEnumerator();
while (ie.MoveNext() == true)
{
listBox2.Items.Add(ie.Current.ToString());
}
}
}
}
Excute the project F5
What is IEnumerator?
->this is a predefined interface
->IEnumarator holds a collection of items (values) and also maintains a record pointer(shows the current items)
->record pointer by defaults points to the before first record
->MoveNext() moves the record pointer to the next item, If next item is not existing then moveNext() returns false.
