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How to Use the Sample Code

Create a new Windows Application project in Visual C#. Form1 is created automatically.

Add a ComboBox control to Form1.

Add the following code to the Load event of the form:

// Add some items to the ComboBox list.

this.comboBox1.Text = "";

this.comboBox1.Items.Add("a");

this.comboBox1.Items.Add("aaa");

this.comboBox1.Items.Add("combo");

this.comboBox1.Items.Add("combobox");

this.comboBox1.Items.Add("combobox test");

this.comboBox1.Items.Add("common");

this.comboBox1.Items.Add("common dialog");

Add the following code to the KeyUp event of the ComboBox control:

int index;

string actual;

string found;

// Do nothing for certain keys, such as navigation keys.

if ((e.KeyCode == Keys.Back) ||

(e.KeyCode == Keys.Left) ||

(e.KeyCode == Keys.Right) ||

(e.KeyCode == Keys.Up) ||

(e.KeyCode == Keys.Down) ||

(e.KeyCode == Keys.Delete) ||

(e.KeyCode == Keys.PageUp) ||

(e.KeyCode == Keys.PageDown) ||

(e.KeyCode == Keys.Home) ||

(e.KeyCode == Keys.End))

{

return;

}

// Store the actual text that has been typed.

actual = this.comboBox1.Text;

// Find the first match for the typed value.

index = this.comboBox1.FindString(actual);

// Get the text of the first match.

if (index > -1)

{

found = this.comboBox1.Items[index].ToString();

// Select this item from the list.

this.comboBox1.SelectedIndex = index;

// Select the portion of the text that was automatically

// added so that additional typing replaces it.

this.comboBox1.SelectionStart = actual.Length;

this.comboBox1.SelectionLength = found.Length;

}

Note The code should be changed in Visual Studio 2005. When you create a Windows Forms project, Visual C# adds one form to the project by default. This form is named Form1. The two files that represent the form are named Form1.cs and Form1.designer.cs. You write your code in Form1.cs. The Designer.cs file is where the Windows Forms Designer writes the code that implements all the actions that you performed by adding controls. For more information about the Windows Forms Designer in Visual C# 2005, visit the following Microsoft Web site:

http://msdn2.microsoft.com/en-us/library/ms173077.aspx

Save and then run the sample.