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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. The approach is one that I will try to employ whenever possible.There is also an added bonus to doing this and that is the user does not need to type, which means no typos!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.This slows down your application and causes the following message in your debug window: System. Data Error: 16 : Cannot get ‘Item[]‘ value (type ‘Validation Error’) from ‘(Validation. when you're new to WPF it's not obvious sometimes what goes where or what references are needed etc. How will you stop user from going to next page till user clears all validations on this page? As soon as user will click submit button, all client side validators will validate and of any of them fails then user remains on the same page. I have a little problem in this validation process. Errors)’ (type ‘Read Only Observable Collection`1′). I don't wan't to show user the validation errors (red border on controls) before they try to save the form.

A name doesn't generally contain weird symbols, and definitely not numbers. This can be from the mouse clicking inside another field, or a Tab key being pressed to navigate to the next input control. ") Else Email Valid = True 'Email is Perfect End If Else 'Not A Match To Pattern Email Valid = False 'Set Boolean Variable To False Message Box. I hope you have learned from this article and that you have enjoyed it as much as I did. There are no hard and fast rules for which controls should be used for what purpose, only guides.If the truth be known the only limit to this is sometimes your own imagination and ability as a developer.There are 2 important points to note here: The most important part of both of these codes is that we allowed the user to make a choice as to whether they want to add their entry to the list or not.If they say No, then we should carry on without adding it. The Add Item method is pretty straightforward, but you should realize that even if they say Yes, the new entry will no longer be part of the list soon as the User Form unloads!

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