The following program demonstrates how to add Text and Value to an Item of a ComboBox without using any Binding DataSource.
In order to add Text and Value, here using a Dictionary Object to store text and values.
Dictionary<string, string> comboSource = new Dictionary<string, string>();
comboSource.Add("1", "Sunday");
comboSource.Add("2", "Monday");
VB.Net
Dim comboSource As New Dictionary(Of String, String)()
comboSource.Add("1", "Sunday")
comboSource.Add("2", "Monday")
How To Add (Item and Value) Into ComboBox
After adding items to the Dictionary, next step is to set this Dictionary Object as a DataSource in the Combobox
C#
comboBox1.DataSource = new BindingSource(comboSource, null);
comboBox1.DisplayMember = "Value";
comboBox1.ValueMember = "Key";
VB.Net
ComboBox1.DataSource = New BindingSource(comboSource, Nothing)
ComboBox1.DisplayMember = "Value"
ComboBox1.ValueMember = "Key"
How to add Text and Value in combobox
Now the first part is over, next is to retrieve these keys and values from the Combobox.
C#
string key = ((KeyValuePair<string, string>)comboBox1.SelectedItem).Key;
string value = ((KeyValuePair<string, string>)comboBox1.SelectedItem).Value;
VB.Net
Dim key As String = DirectCast(ComboBox1.SelectedItem, KeyValuePair(Of String, String)).Key
Dim value As String = DirectCast(ComboBox1.SelectedItem, KeyValuePair(Of String, String)).Value
Source Code | C#
using System;
using System.Collections.Generic;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
Dictionary<string, string> comboSource = new Dictionary<string, string>();
comboSource.Add("1", "Sunday");
comboSource.Add("2", "Monday");
comboSource.Add("3", "Tuesday");
comboSource.Add("4", "Wednesday");
comboSource.Add("5", "Thursday");
comboSource.Add("6", "Friday");
comboSource.Add("7", "Saturday");
comboBox1.DataSource = new BindingSource(comboSource, null);
comboBox1.DisplayMember = "Value";
comboBox1.ValueMember = "Key";
}
private void button1_Click(object sender, EventArgs e)
{
string key = ((KeyValuePair<string, string>)comboBox1.SelectedItem).Key;
string value = ((KeyValuePair<string, string>)comboBox1.SelectedItem).Value;
MessageBox.Show(key + " " + value);
}
}
}
Source Code | Vb.Net
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim comboSource As New Dictionary(Of String, String)()
comboSource.Add("1", "Sunday")
comboSource.Add("2", "Monday")
comboSource.Add("3", "Tuesday")
comboSource.Add("4", "Wednesday")
comboSource.Add("5", "Thursday")
comboSource.Add("6", "Friday")
comboSource.Add("7", "Saturday")
ComboBox1.DataSource = New BindingSource(comboSource, Nothing)
ComboBox1.DisplayMember = "Value"
ComboBox1.ValueMember = "Key"
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim key As String = DirectCast(ComboBox1.SelectedItem, KeyValuePair(Of String, String)).Key
Dim value As String = DirectCast(ComboBox1.SelectedItem, KeyValuePair(Of String, String)).Value
MessageBox.Show(key & " " & value)
End Sub
End Class
Autocomplete ComboBox
From the version Visual Studio 2005, some of the controls support Autocomplete feature including the ComboBox controls. From the following link you can see how to make .... Autocomplete ComboBox
ComboBox Control
A ComboBox displays a text box combined with a ListBox, which enables the user to select items from the list or enter a new value. You can learn more operations in ComboBox from the following link
C# ComboBox VB.Net ComboBox
