<Slider Name="sliderFontSize" Minimum="1" Maximum="40" Value="10" TickFrequency="1" TickPlacement="TopLeft" /> <TextBlock Name="lblSampleText" Text="Simple Text" FontSize="{Binding Source=sliderFontSize, Path=Value}" />The TextBlock's FontSize will change to the slider control's value. This binding in the xaml is saying, "Create a binding to the sliderFontSize.Value property."
Here's how you would create the equivalent binding in C#:
Binding binding = new Binding(); binding.Source = sliderFontSize; binding.Path = new PropertyPath("Value"); lblSampleText.SetBinding(TextBlock.FontSizeProperty, binding);More Info: Data Binding
