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How to: Access Design-Time Support in Windows Forms

Your custom components and controls are designable, which means they have settings that users can configure with a graphical user interface (UI) at design time. These settings usually affect instances of the component at run time.

If your class implements the IComponent interface, it can participate in a design environment like Visual Studio.

To access the design-time support provided by the .NET Framework, you need to complete the following steps.

Note Note

You must add a reference to the design-time assembly, System.Design.dll. This assembly is not included in the .NET Framework 4 Client Profile. To add a reference to System.Design.dll, you must change the project's Target Framework to .NET Framework 4.

To access design-time support

  1. Add a reference to the System.Design assembly.

  2. If you are implementing a UITypeEditor or if your component is interacting with a Toolbox or PropertyGrid control, import the System.Drawing.Design namespace.

    using System.Drawing.Design;
    
  3. If you are implementing a custom design-time experience for your component, import the System.ComponentModel.Design namespace.

    using System.ComponentModel.Design;
    
  4. If you are implementing a custom design-time experience for your Windows Forms control, import the System.Windows.Forms.Design namespace. You can create smart tags or a custom designer for your component with types in this namespace.

    using System.Windows.Forms.Design;
    
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