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           textbox1.AutoCompleteMode = AutoCompleteMode.Suggest;

            textbox1.AutoCompleteSource = AutoCompleteSource.CustomSource;

            AutoCompleteStringCollection acsc = new AutoCompleteStringCollection();

            for (int i = 0; i < 100;i++ )

                acsc.Add("admin"+i.ToString());

            textbox1.AutoCompleteCustomSource = acsc;

using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Data;



namespace Auto_Complete_ComboBox

{

	/// <summary>

	/// Summary description for Form1.

	/// </summary>

	public class frmAutoCompleteComboBox : System.Windows.Forms.Form

	{

		internal System.Windows.Forms.Label lblTest;

		internal System.Windows.Forms.CheckBox chkLimitToList;

		internal System.Windows.Forms.CheckBox chkAutoComplete;

		internal System.Windows.Forms.ComboBox cbAutoComplete;

		/// <summary>

		/// Required designer variable.

		/// </summary>

		private System.ComponentModel.Container components = null;



		public frmAutoCompleteComboBox()

		{

			//

			// Required for Windows Form Designer support

			//

			InitializeComponent();



			//

			// TODO: Add any constructor code after InitializeComponent call

			//

		}



		/// <summary>

		/// Clean up any resources being used.

		/// </summary>

		protected override void Dispose( bool disposing )

		{

			if( disposing )

			{

				if (components != null) 

				{

					components.Dispose();

				}

			}

			base.Dispose( disposing );

		}



		#region Windows Form Designer generated code

		/// <summary>

		/// Required method for Designer support - do not modify

		/// the contents of this method with the code editor.

		/// </summary>

		private void InitializeComponent()

		{

			this.lblTest = new System.Windows.Forms.Label();

			this.chkLimitToList = new System.Windows.Forms.CheckBox();

			this.chkAutoComplete = new System.Windows.Forms.CheckBox();

			this.cbAutoComplete = new System.Windows.Forms.ComboBox();

			this.SuspendLayout();

			// 

			// lblTest

			// 

			this.lblTest.AutoSize = true;

			this.lblTest.Location = new System.Drawing.Point(8, 151);

			this.lblTest.Name = "lblTest";

			this.lblTest.Size = new System.Drawing.Size(0, 16);

			this.lblTest.TabIndex = 7;

			// 

			// chkLimitToList

			// 

			this.chkLimitToList.Checked = true;

			this.chkLimitToList.CheckState = System.Windows.Forms.CheckState.Checked;

			this.chkLimitToList.FlatStyle = System.Windows.Forms.FlatStyle.System;

			this.chkLimitToList.Location = new System.Drawing.Point(208, 39);

			this.chkLimitToList.Name = "chkLimitToList";

			this.chkLimitToList.Size = new System.Drawing.Size(80, 16);

			this.chkLimitToList.TabIndex = 2;

			this.chkLimitToList.Text = "Limit to List";

			// 

			// chkAutoComplete

			// 

			this.chkAutoComplete.Checked = true;

			this.chkAutoComplete.CheckState = System.Windows.Forms.CheckState.Checked;

			this.chkAutoComplete.FlatStyle = System.Windows.Forms.FlatStyle.System;

			this.chkAutoComplete.Location = new System.Drawing.Point(208, 15);

			this.chkAutoComplete.Name = "chkAutoComplete";

			this.chkAutoComplete.Size = new System.Drawing.Size(96, 16);

			this.chkAutoComplete.TabIndex = 1;

			this.chkAutoComplete.Text = "Auto Complete";

			// 

			// cbAutoComplete

			// 

			this.cbAutoComplete.Items.AddRange(new object[] {

									"Aaron Bud",

																"Aarts Jan",

																"Abas S.J.",

																"Abbey Michael",

																"Abdelguerfi Mahdi",

																"Abel David",

																"Abel Peter",

																"Abelson Amanda",

										

													"Zernik Uri",

																"Ziarko Wojciech P.",

																"Zicari Roberto"});

			this.cbAutoComplete.Location = new System.Drawing.Point(16, 15);

			this.cbAutoComplete.MaxDropDownItems = 10;

			this.cbAutoComplete.Name = "cbAutoComplete";

			this.cbAutoComplete.Size = new System.Drawing.Size(176, 21);

			this.cbAutoComplete.TabIndex = 0;

			this.cbAutoComplete.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.cbAutoComplete_KeyPress);

			// 

			// frmAutoCompleteComboBox

			// 

			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);

			this.ClientSize = new System.Drawing.Size(312, 182);

			this.Controls.Add(this.lblTest);

			this.Controls.Add(this.chkLimitToList);

			this.Controls.Add(this.chkAutoComplete);

			this.Controls.Add(this.cbAutoComplete);

			this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;

			this.MaximizeBox = false;

			this.Name = "frmAutoCompleteComboBox";

			this.Text = "Auto Complete ComboBox - Example";

			this.ResumeLayout(false);



		}

		#endregion



		/// <summary>

		/// The main entry point for the application.

		/// </summary>

		[STAThread]

		static void Main() 

		{

			Application.Run(new frmAutoCompleteComboBox());

		}



		private void cbAutoComplete_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)

		{

			if (this.chkAutoComplete.Checked)

				this.AutoComplete(this.cbAutoComplete, e, this.chkAutoComplete.Checked);

		}



        

		

		// AutoComplete

		public void AutoComplete(ComboBox cb, System.Windows.Forms.KeyPressEventArgs e)

		{

			this.AutoComplete(cb, e, false);

		}



		public void AutoComplete(ComboBox cb, System.Windows.Forms.KeyPressEventArgs e, bool blnLimitToList)

		{

			string strFindStr = "";



			if (e.KeyChar == (char)8) 

			{

				if (cb.SelectionStart <= 1) 

				{

					cb.Text = "";

					return;

				}



				if (cb.SelectionLength == 0)

					strFindStr = cb.Text.Substring(0, cb.Text.Length - 1);

						else 

					strFindStr = cb.Text.Substring(0, cb.SelectionStart - 1);

					}

			else 

			{

				if (cb.SelectionLength == 0)

					strFindStr = cb.Text + e.KeyChar;

				else

					strFindStr = cb.Text.Substring(0, cb.SelectionStart) + e.KeyChar;

			}



			int intIdx = -1;



			// Search the string in the ComboBox list.

			

			intIdx = cb.FindString(strFindStr);

 

			if (intIdx != -1)

			{

				cb.SelectedText = "";

				cb.SelectedIndex = intIdx;

				cb.SelectionStart = strFindStr.Length;

				cb.SelectionLength = cb.Text.Length;

				e.Handled = true;

			}

			else

			{

				e.Handled = blnLimitToList;

			}



		}





	}

}

补充：.NET技术 ,  C#

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