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Home/ Questions/Q 1030183
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Editorial Team
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Editorial Team
Asked: May 16, 20262026-05-16T12:39:34+00:00 2026-05-16T12:39:34+00:00

Throughout Silverlight and WPF, properties that are boolean values are prefixed with Is (

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Throughout Silverlight and WPF, properties that are boolean values are prefixed with Is (almost all), for example:

  • IsEnabled
  • IsTabStop
  • IsHitTestVisible

In all other Microsoft frameworks (winforms, BCL, ASP.NET) Is is not used. What prompted their team to move away from the original naming convention – is it an evolution or a miss-naming that had to stick?

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  1. Editorial Team
    Editorial Team
    2026-05-16T12:39:35+00:00Added an answer on May 16, 2026 at 12:39 pm

    Personally, I always try to prefix boolean values with something that adds a little more meaning (is, has, can, etc.). My usage comes from the following Microsoft guidelines:

    Do name Boolean properties with an
    affirmative phrase (CanSeek instead of
    CantSeek). Optionally, you can also
    prefix Boolean properties with Is,
    Can, or Has, but only where it adds
    value.

    MSDN – Names of Type Members

    I don’t believe this was always the case This wasn’t always the case. Those practices date back to .NET 2.0. Before that, things were fair game. Cleaning up those names in newer versions of the Framework, however, would cause all kinds of headaches (hence some of the Framework code uses the convention and some doesn’t).

    It definitely makes things more readable though. Even using an example from your question. Which would you rather have?

    // ambiguous naming, could mean many things
    myTab.TabStop
    

    or

    // definitely a true/false value
    myTab.IsTabStop
    
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