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TextChangedEventArgs Class

Provides data for the TextChanged event.

Namespace:  System.Windows.Controls
Assembly:  PresentationFramework (in PresentationFramework.dll)

Public Class TextChangedEventArgs _
	Inherits RoutedEventArgs
Dim instance As TextChangedEventArgs
You cannot directly create an instance of this class in XAML.

The following example displays the number of times the text in a TextBox changes. Below is the XAML code for the example.

<Page xmlns=""
      Here is the initial text in the textbox.  Each time the contents of this box is changed, a change counter will
      be incremented and displayed in the TextBox below.  Note that the TextChanged event is called when the TextBox
      control is initially populated with text, so the changes counter starts of at 1.
    <TextBox Name="tbCounterText">0</TextBox>


Below is the code behind for the example.

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;

namespace SDKSample

    public partial class DetectChangedTextExample : Page

        // This is a counter for the number of times the TextChanged fires
        // for the tbCountingChanges TextBox.
        private int uiChanges = 0;

        // Event handler for TextChanged Event.
        private void textChangedEventHandler(object sender, TextChangedEventArgs args)

            if (tbCounterText != null)
                tbCounterText.Text = uiChanges.ToString();



Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0