Install-Package Syncfusion.Tools.Windows

using System;
using System.Windows.Forms;
using Syncfusion.Windows.Forms.Tools;

namespace AutoCompleteDemo
{
    public partial class Form1 : Form
    {
        private AutoComplete autoComplete1;
        
        public Form1()
        {
            InitializeComponent();
            
            // Create AutoComplete control
            autoComplete1 = new AutoComplete();
            autoComplete1.Location = new System.Drawing.Point(20, 20);
            autoComplete1.Size = new System.Drawing.Size(200, 20);
            autoComplete1.ParentForm = this;
            
            // Add data source
            autoComplete1.DataSource = new string[] 
            { 
                "Australia", 
                "Austria", 
                "Brazil", 
                "Canada", 
                "China" 
            };
            
            // Add to form
            this.Controls.Add(autoComplete1);
        }
    }
}

AutoComplete autoComplete1 = new AutoComplete();
autoComplete1.Location = new System.Drawing.Point(20, 20);
autoComplete1.Size = new System.Drawing.Size(200, 20);
autoComplete1.ParentForm = this;

// Add string data
autoComplete1.DataSource = new string[] 
{
    "John", "Jane", "Bob", "Alice", "Charlie"
};

this.Controls.Add(autoComplete1);

AutoComplete autoComplete1 = new AutoComplete();
autoComplete1.ParentForm = this;

// Create DataTable
DataTable dt = new DataTable();
dt.Columns.Add("Name", typeof(string));
dt.Columns.Add("Email", typeof(string));
dt.Rows.Add("John Doe", "john@example.com");
dt.Rows.Add("Jane Smith", "jane@example.com");

autoComplete1.DataSource = dt;
autoComplete1.DisplayMember = "Name";

this.Controls.Add(autoComplete1);

AutoComplete autoComplete1 = new AutoComplete();
autoComplete1.ParentForm = this;
autoComplete1.Style = AutoCompleteStyle.Default;

// Create DataTable with multiple columns
DataTable dt = new DataTable();
dt.Columns.Add("Name", typeof(string));
dt.Columns.Add("Country", typeof(string));
dt.Columns.Add("City", typeof(string));

dt.Rows.Add("John Doe", "USA", "New York");
dt.Rows.Add("Jane Smith", "UK", "London");
dt.Rows.Add("Bob Johnson", "Canada", "Toronto");

autoComplete1.DataSource = dt;

// Configure columns
autoComplete1.Columns.Add(new AutoCompleteDataColumnInfo("Name", 100));
autoComplete1.Columns.Add(new AutoCompleteDataColumnInfo("Country", 80));
autoComplete1.Columns.Add(new AutoCompleteDataColumnInfo("City", 80));

this.Controls.Add(autoComplete1);

AutoComplete autoComplete1 = new AutoComplete();
autoComplete1.ParentForm = this;
autoComplete1.DataSource = GetDataSource();

// Handle custom filtering
autoComplete1.AutoCompleteControl.ItemsListBox.DrawItem += 
    new DrawItemEventHandler(ItemsListBox_DrawItem);

void ItemsListBox_DrawItem(object sender, DrawItemEventArgs e)
{
    if (e.Index >= 0)
    {
        // Custom drawing logic
        e.DrawBackground();
        e.Graphics.DrawString(
            autoComplete1.AutoCompleteControl.ItemsListBox.Items[e.Index].ToString(),
            e.Font,
            Brushes.Black,
            e.Bounds);
        e.DrawFocusRectangle();
    }
}

this.Controls.Add(autoComplete1);

AutoComplete autoComplete1 = new AutoComplete();
autoComplete1.ParentForm = this;
autoComplete1.Size = new System.Drawing.Size(300, 20);

// Common URLs
autoComplete1.DataSource = new string[]
{
    "http://www.syncfusion.com",
    "http://www.google.com",
    "http://www.microsoft.com",
    "http://www.github.com"
};

// Enable append mode for URL completion
autoComplete1.AutoCompleteMode = AutoCompleteMode.SuggestAppend;

this.Controls.Add(autoComplete1);

autoComplete1.Style = AutoCompleteStyle.Office2016Colorful;