xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
xmlns:d='http://schemas.microsoft.com/expression/blend/2008'
xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'
mc:Ignorable='d'
d:DesignWidth='640'
d:DesignHeight='480'>
Height="100"
AcceptsReturn="True"
LostFocus="TextBox_LostFocus"
SelectionChanged="TextBox_SelectionChanged" />
//File: Page.xaml.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
namespace SilverlightApplication3
{
public partial class MainPage : UserControl
{
public MainPage()
{
InitializeComponent();
}
private void TextBox_SelectionChanged(object sender, RoutedEventArgs e)
{
TextBox t = sender as TextBox;
int st = t.SelectionStart;
int ln = t.SelectionLength;
string strT = t.SelectedText;
}
private void TextBox_LostFocus(object sender, RoutedEventArgs e)
{
}
}
}