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    <p>An easy way to get Design-time-data in Visual Studio 2010 is to use a design-datacontext. Short example with a Window and a ViewModel, For DataContext, the d:DataContext will be used in Design-mode and the StaticResource will be used in runtime. You can also use a separate ViewModel for design but in this example I will use the same ViewModel for both.</p> <pre><code>&lt;Window ... xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:local="clr-namespace:DesignTimeData" mc:Ignorable="d" d:DataContext="{d:DesignInstance local:MyViewModel, IsDesignTimeCreatable=True}"&gt; &lt;Window.Resources&gt; &lt;local:MyViewModel x:Key="MyViewModel" /&gt; &lt;/Window.Resources&gt; &lt;Window.DataContext&gt; &lt;StaticResource ResourceKey="MyViewModel"/&gt; &lt;/Window.DataContext&gt; &lt;StackPanel&gt; &lt;TextBox Text="{Binding MyText}" Width="75" Height="25" Margin="6"/&gt; &lt;/StackPanel&gt; &lt;/Window&gt; </code></pre> <p>And in the ViewModels property MyText we check if we're in design mode and in that case we return something else.</p> <pre><code>public class MyViewModel : INotifyPropertyChanged { public MyViewModel() { MyText = "Runtime-Text"; } private string m_myText; public string MyText { get { // Or you can use // DesignerProperties.GetIsInDesignMode(this) if (Designer.IsDesignMode) { return "Design-Text"; } return m_myText; } set { m_myText = value; OnPropertyChanged("MyText"); } } public event PropertyChangedEventHandler PropertyChanged; private void OnPropertyChanged(string propertyName) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } } } </code></pre> <p>Designer.cs, which is found <a href="http://sachabarber.net/?p=707" rel="noreferrer">here</a>, looks like this</p> <pre><code>public static class Designer { private static readonly bool isDesignMode; public static bool IsDesignMode { get { return isDesignMode; } } static Designer() { DependencyProperty prop = DesignerProperties.IsInDesignModeProperty; isDesignMode = (bool)DependencyPropertyDescriptor. FromProperty(prop, typeof(FrameworkElement)) .Metadata.DefaultValue; } } </code></pre>
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