In Windows Forms, ListBox control is used to show multiple elements in a list, from which a user can select one or more elements and the elements are generally displayed in multiple columns. In ListBox, you are allowed to sort the elements present in the ListBox using Sorted Property of the ListBox. This property always sorts the string type elements in the alphabetical order and integer type elements in ascending order. The default value of this property is false. You can set this property in two different ways:
1. Design-Time: It is the easiest way to sort the elements present in the ListBox as shown in the following steps:
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Step 1: Create a windows form as shown in the below image:
Visual Studio -> File -> New -> Project -> WindowsFormApp -
Step 2: Drag the ListBox control from the ToolBox and drop it on the windows form. You are allowed to place a ListBox control anywhere on the windows form according to your need.
-
Step 3: After drag and drop you will go to the properties of the ListBox control to sort the elements of the ListBox.
Output:
2. Run-Time: It is a little bit trickier than the above method. In this method, you can sort the elements present in the ListBox control programmatically with the help of given syntax:
public bool Sorted { get; set; }
Here, the value of this property is of System.Boolean type. If you want to sort the elements present in the Listbox, then set the value of this property to true. Otherwise, false. The following steps show how to set the Sorted property of the ListBox dynamically:
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Step 1: Create a list box using the ListBox() constructor is provided by the ListBox class.
// Creating ListBox using ListBox class constructor ListBox lstbox = new ListBox();
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Step 2: After creating ListBox, set the Sorted property of the ListBox provided by the ListBox class.
// Sorting the elements of the listbox lstbox.Sorted = true;
-
Step 3: And last add this ListBox control to the form using Add() method.
// Add this ListBox to the form this.Controls.Add(lstbox);
Example:
using
System;
using
System.Collections.Generic;
using
System.ComponentModel;
using
System.Data;
using
System.Drawing;
using
System.Linq;
using
System.Text;
using
System.Threading.Tasks;
using
System.Windows.Forms;
namespace
WindowsFormsApp28 {
public
partial
class
Form1 : Form {
public
Form1()
{
InitializeComponent();
}
private
void
Form1_Load(
object
sender, EventArgs e)
{
// Creating and setting the
// properties of the label
Label lb =
new
Label();
lb.Location =
new
Point(243, 80);
lb.Text =
"Select post"
;
// Adding label control to the form
this
.Controls.Add(lb);
// Creating and setting the
// properties of ListBox
ListBox lstbox =
new
ListBox();
lstbox.Location =
new
Point(246, 104);
lstbox.Sorted =
true
;
lstbox.Items.Add(
"Intern"
);
lstbox.Items.Add(
"Software Engineer"
);
lstbox.Items.Add(
"Project Manager"
);
lstbox.Items.Add(
"HR"
);
// Adding listbox control to the form
this
.Controls.Add(lstbox);
}
}
}
Output:
Before sorting:
After sorting: