Autocomplete ComboBox


A ComboBox displays a text box combined with a ListBox, which enables the user to select items from the list or enter new values. From the version Visual Studio 2005, some of the controls support Autocomplete feature including the ComboBox controls.

autocomplete combobox c#

Autocomplete ComboBox

autocomplete combobox property c#

The AutoComplete properties like AutoCompleteCustomSource, AutoCompleteMode and AutoCompleteSource to perform a TextBox that automatically completes user entry strings by comparing the initial letters being entered to the prefixes of all strings in a data source. The use of the AutoCompleteCustomSource property is optional, but you must set the AutoCompleteSource property to CustomSource in order to use AutoCompleteCustomSource like data source from database, list etc.

C# Autocomplete ComboBox

autocomplete combobox

The following program displays a C# Autocomplete ComboBox that select the values from Database and add to AutoCompleteStringCollection of the Autocomplete ComboBox.

Source Code | C#
using System; using System.Data; using System.Data.SqlClient ; using System.Windows.Forms; namespace WindowsFormsApplication1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { comboBox1.AutoCompleteMode = AutoCompleteMode.Suggest; comboBox1.AutoCompleteSource = AutoCompleteSource.CustomSource; AutoCompleteStringCollection combData = new AutoCompleteStringCollection(); getData(combData); comboBox1.AutoCompleteCustomSource = combData; } private void getData(AutoCompleteStringCollection dataCollection) { string connetionString = null; SqlConnection connection; SqlCommand command; SqlDataAdapter adapter = new SqlDataAdapter(); DataSet ds = new DataSet(); connetionString = "Data Source=.;Initial Catalog=pubs;User ID=sa;password=zen412"; string sql = "SELECT DISTINCT [fname] FROM [employee]"; connection = new SqlConnection(connetionString); try { connection.Open(); command = new SqlCommand(sql, connection); adapter.SelectCommand = command; adapter.Fill(ds); adapter.Dispose(); command.Dispose(); connection.Close(); foreach (DataRow row in ds.Tables[0].Rows) { dataCollection.Add(row[0].ToString()); } } catch (Exception ex) { MessageBox.Show("Can not open connection ! "); } } } }

VB.Net Autocomplete ComboBox

autocomplete combobox c#

The following program displays a VB.Net Autocomplete ComboBox that select the values from Database and add to AutoCompleteStringCollection of the Autocomplete ComboBox.

Source Code | VB.Net
Imports System.Data Imports System.Data.SqlClient Public Class Form1 Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load ComboBox1.AutoCompleteMode = AutoCompleteMode.Suggest ComboBox1.AutoCompleteSource = AutoCompleteSource.CustomSource Dim combData As New AutoCompleteStringCollection() getData(combData) ComboBox1.AutoCompleteCustomSource = combData End Sub Private Sub getData(ByVal dataCollection As AutoCompleteStringCollection) Dim connetionString As String = Nothing Dim connection As SqlConnection Dim command As SqlCommand Dim adapter As New SqlDataAdapter() Dim ds As New DataSet() connetionString = "Data Source=.;Initial Catalog=pubs;User ID=sa;password=zen412" Dim sql As String = "SELECT DISTINCT [fname] FROM [employee]" connection = New SqlConnection(connetionString) Try connection.Open() command = New SqlCommand(sql, connection) adapter.SelectCommand = command adapter.Fill(ds) adapter.Dispose() command.Dispose() connection.Close() For Each row As DataRow In ds.Tables(0).Rows dataCollection.Add(row(0).ToString()) Next Catch ex As Exception MessageBox.Show("Can not open connection ! ") End Try End Sub End Class

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