<Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="WPF" Height="300" Width="300"> <Canvas> <Slider Canvas.Top="10" Canvas.Left="20" Name="sldSlider" Minimum="0" Maximum="1000" Value="500" Width="250" MouseWheel="Slider_MouseWheel"/> <RichTextBox Canvas.Top="50" Canvas.Left="20" Width="250" Height="100" VerticalScrollBarVisibility="Visible"> <FlowDocument> <List> <ListItem> <Paragraph> <Bold>Bold List Item</Bold> </Paragraph> </ListItem> <ListItem> <Paragraph> <Italic>Italic List Item</Italic> </Paragraph> </ListItem> <ListItem> <Paragraph> <Underline>Underlined List Item</Underline> </Paragraph> </ListItem> </List> <List> <ListItem> <Paragraph> <Bold>Bold List Item</Bold> </Paragraph> </ListItem> <ListItem> <Paragraph> <Italic>Italic List Item</Italic> </Paragraph> </ListItem> <ListItem> <Paragraph> <Underline>Underlined List Item</Underline> </Paragraph> </ListItem> </List> <List> <ListItem> <Paragraph> <Bold>Bold List Item</Bold> </Paragraph> </ListItem> <ListItem> <Paragraph> <Italic>Italic List Item</Italic> </Paragraph> </ListItem> <ListItem> <Paragraph> <Underline>Underlined List Item</Underline> </Paragraph> </ListItem> </List> <Paragraph FontSize="12"> Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. </Paragraph> <Paragraph FontSize="15"> Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure. </Paragraph> <Paragraph FontSize="18">A List</Paragraph> <List> <ListItem> <Paragraph> <Bold>Bold List Item</Bold> </Paragraph> </ListItem> <ListItem> <Paragraph> <Italic>Italic List Item</Italic> </Paragraph> </ListItem> <ListItem> <Paragraph> <Underline>Underlined List Item</Underline> </Paragraph> </ListItem> </List> </FlowDocument> </RichTextBox> <Rectangle Canvas.Top="160" Canvas.Left="20" Name="shpRectangle" Fill="LightBlue" Width="50" Height="50" MouseWheel="Rectangle_MouseWheel"> </Rectangle> </Canvas> </Window> //File:Window.xaml.cs using System.Windows; using System.Windows.Input; namespace WpfApplication1 { public partial class Window1 : Window { public Window1() { InitializeComponent(); } private void Slider_MouseWheel(object sender, MouseWheelEventArgs e) { sldSlider.Value += (e.Delta > 0) ? 5 : -5; } private void Rectangle_MouseWheel(object sender, MouseWheelEventArgs e) { if (e.LeftButton == MouseButtonState.Pressed) { double newWidth = shpRectangle.Width += (e.Delta > 0) ? 5 : -5; if (newWidth < 10) newWidth = 10; if (newWidth > 200) newWidth = 200; shpRectangle.Width = newWidth; }else{ double newHeight = shpRectangle.Height += (e.Delta > 0) ? 5 : -5; if (newHeight < 10) newHeight = 10; if (newHeight > 200) newHeight = 200; shpRectangle.Height = newHeight; } } } }