C# Combobox - c# - c# tutorial - c# net



How to use Combobox in C# ?

  • In general, Windows form represents a combo box control.
  • In C# controls, ComboBox is a combination of TextBox with a drop-down.
  • This drop-down list presents certain choices.
  • The user can type anything into the ComboBox.
  • Only one list item is displayed at one time in a ComboBox and other available items are loaded in a drop down list.
  • The ComboBox class represents a control that encapsulates other controls.
 Combobox

Combobox

 c sharp controls
  1. Go to tool box and select Combobox, here it is displays an editable with a drop-down list of the permitted values.
  2. Go to tool box and click on the combobox option the drop down list will be open.
  3. Go to properties select Item Collection, here it is specifying to holds the list of items that constitute the content of an ItemsControl.
  4. When we click on the Collections, the String Collection Editor window will pop up where you can type strings. Each line added to this collection will become a ComboBox item. Here we add three items New York, Washington, New jersey.
  5. After click on "ok" button these items are including in the drop down list of cities.

Common Properties

            Height="23" 
            HorizontalAlignment="Left" 
            Margin="112,87,0,0" 
            Name="comboBox1" 
            VerticalAlignment="Top" 
            Width="120" />
click below button to copy the code. By - c# tutorial - team

Sample C# examples - Output :

 c sharp controls combobox
  1. Here in this output table displays the List of Cities "New York, Washington, New jersey".
 c sharp controls combobox list
  1. item collection is specifying to holds the list of items that constitute the content of an ItemsControl.
  2. To add these event handlers, you go to Events window and double click on CheckedChanged and CheckedStateChanged events.
  3. And choose the SelectedIndexChanged option.

C# Sample Code - C# Examples

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

        private void Form1_Click(object sender, EventArgs e)
        {
         
        }

        private void Form1_Load(object sender, EventArgs e)
        {
          
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            MessageBox.Show(comboBox1.SelectedItem.ToString());
        }
    }
}


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Code Explanation:

 c sharp controls combobox code
  1. Here private void comboBox1_SelectedIndexChanged (object sender, EventArgs e) Occurs when the SelectedIndex property has changed. The two parameters, "object sender" and "EventArgs e" parameters of function of event of a button such as private void comboBox1_SelectedIndexChanged (object sender, EventArgs e).
  2. MessageBox.Show(comboBox1.SelectedItem.ToString()); specifies to shows the selected items of the string.
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Sample C# examples - Output :

 c sharp controls C# Sample Code - C# Examples
  1. Here in this output table we display the List of Cities "Washington".
  2. Here in this output we display the Washington massage box

Dynamic loading of data through C# code:

 c-sharp-dynamic
  1. When we click on the Collections, the String Collection Editor window will pop up where you can type strings. Each line added to this collection will become a ComboBox item.

C# Sample Code - C# Examples

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 WikiTechy_Csharp_Windows_Application
{
    public partial class Form1 : Form
    {
    public Form1()
    {
        InitializeComponent();
    }
    private void Form1_Click(object sender, EventArgs e)
    {     
    }
    private void Form1_Load(object sender, EventArgs e)
    {
        List<string> list=new List<string>();
        list.Add("DotNet");
        list.Add("Java");
        list.Add("SQL Server");
        comboBox1.DataSource = list;

    }
    private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
    {
        MessageBox.Show(comboBox1.SelectedItem.ToString());
    }
    }
}


click below button to copy the code. By - c# tutorial - team

Code Explanation:

 c-sharp-dynamic C# Sample Code - C# Examples
  • List<string> list=new List<string>(); specifies to list of string objects.
  • In this example list.Add("DotNet"); list.Add("Java"); list.Add("SQL Server"); specifies to add the string of "List of Cities" .
  • comboBox1.DataSource = list; used to specify the data source of comboBox and the table which will be bind to. When we run the code a window will show with a comboBox that containing all the returning rows.

Selected Index

 c sharp sample
  1. comboBox1.SelectedIndex =2; Gets or Sets the index specifying the currently selected item is 2

Sample C# examples - Output :

c sharp code output
  1. Here in this output table we display the List of Cities "Java".
  2. Here in this output table we display the Java massage box.


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