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How to show placeholder text in a WPF TextBox in C# and VB

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Sometimes, when you have a text box in a user interface, you may want to add placeholder text to that text box to give users a prompt as to what to enter into the text box. If you've ever used UWP or WinUI, you'll probably have noticed that the default text box elements provide a PlaceholderText property that provides this functionality. However, WPF and Windows Forms don't provide this functionality by default. Luckily, thanks to WPF's rendering capabilities, it is quite easy to set up placeholder text manually. If you're using Windows Forms, you can make use of the ElementHost to use a WPF TextBox. Typically, placeholder text is a slightly faded colour compared to user-entered text to help distinguish it and only shows when no text is entered into the text box. An example is below: How to show placeholder text in a WPF TextBox To show placeholder text in a WPF textbox, all we need to do is show a partially transparent, intangible Label above the TextBox like so (Y...
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Windows has had a dark mode feature for a long time now, however, as a Windows Forms and/or WPF (Windows Presentation Foundation) developer, you may have noticed that the Windows dark mode does not affect your app at all automatically - in fact the Windows dark mode only automatically affects UWP, WinUI and Chromium based user interfaces - there's no support for Windows dark mode in Windows Forms and WPF. Tip: If you want to set the title bar's colours to any colours you want instead of just light or dark, follow this guide here . Luckily, it is very easy to determine if dark mode is currently enabled and be notified any time dark mode is switched on or off - from there it's just a matter of updating your UI to match which mode Windows is in. While this may work fine for the client area of your app (i.e. the area of your app that does not include the title bar and border), you don't have a lot of control over the non-client area of your app and you'll notice that by...
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Microsoft WebView2: How to check if the WebView2 runtime is installed in C# and VB

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