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    Wpf textbox validating event

    I'm new to Wpf and validation please help me with the required code This is Xaml code: , you can do the validation in that instead of the setter of a particular property, then whenever there is a error, return an error message so that the text box which has the error gets a red box around it, indicating an error. but 1 for doing what I need To get it done only with XAML you need to add Validation Rules for individual properties.

    In Win Forms I could handle the Validated event to do something after the user changed text in a Text Box.In this example I am implementing an generic validation rule that takes a regular expression as validation rule. If the expression matches the data is treated as valid. What we want to do is a simple entry form for an e-mail address. Markup; --------------------- Hidden note: You have a mistype in the last parameter of this line: --------------------- public override Validation Result Validate(object value, Culture Info ulture Info) --------------------- It's "culture Info" with " C" instead of "ulture Info".If the user enters an invalid e-mail address, the border of the textbox gets red and the tooltip is showing the reason. Problem: I tried to define <sys: String x: Key="email Regex"> but got the error that the TYPE "sys: String" NOT FOUND.

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