How to Create an Autocomplete Textbox in CSharp

In this tutorial, we will learn how to create an auto complete textbox using C# Windows Form Application. This is a very easy task to create a simple program and also you could use this part of a program to integrate in your existing system. So, Let us start!

First, create a new project, (remember we’re going to use the csharp form application not vb), then Add 1 Textbox and 1 Label, and then change the text property to Auto Complete Textbox.

Finish product will be like this:

Go to Code Editor and type the code below:

using System;

using System.Windows.Forms;

namespace TutorialCollectionCSharp

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

      // function that you can call when you run the program

        private void autocomplete()

        {

            TextBox1.AutoCompleteSource = AutoCompleteSource.CustomSource;

            TextBox1.AutoCompleteMode = AutoCompleteMode.SuggestAppend;

      //List of Fruits, you can add a fruits here

            TextBox1.AutoCompleteCustomSource.AddRange(new string[] {"Lemon", "Orange", "Apple", "Grapes", "Banana"});

        }

        private void frmAutoComplete_Load(object sender, EventArgs e)

        {

            autocomplete();

        }

    }

}

The final output: