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Inside the Validating event handler, the TextBox is validated for Empty and White space and if the validation fails i. IsNullOrEmpty txtName. SetError txtName, "Name is required. SetError txtName, string. Empty ;. Object , e As System. CancelEventArgs Handles txtName. If String. Trim Then. SetError txtName, String. End If. End Sub. Related Articles. Add Comments. Thank you for the feedback. The comment is now awaiting moderation. You will be notified via email when the author replies to your comment.
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Please do not post code, scripts or snippets. Required Invalid Email Address. If it is blank, the method sets an error on the field using an ErrorProvider. It sets e. Cancel to the result returned by that method so the focus cannot leave the TextBox if there is an error. Finally the ZIP code text box uses the following Validating event handler. This code calls the RequiredFieldIsBlank method to make sure the user entered a value.
It then uses a regular expression to make sure the entered text has the format or -. When the user tries to move out of a TextBox , its Validating evnet fires. The event handler checks whether the TextBox contains valid text and, if it does not, sets e. Note that the Validating event occurs no matter how the user tries to leave the TextBox. For example, if the user presses Tab, clicks on another control, presses Enter to trigger the Accept button, or presses Esc to trigger the Cancel button.
The event triggers even if the user tries to close the form. That means the user cannot close the form unless the field passes validation. For example, suppose you remove the event handler from the First Name TextBox. None of the other TextBox es gets the focus so their Validating event handlers never get a chance to run so the form closes. Download the example and give it a try. Your email address will not be published. This site uses Akismet to reduce spam.
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CancelEventArgs Handles txtName. If String. Trim Then. SetError txtName, String. End If. End Sub. Related Articles. Add Comments. Thank you for the feedback. The comment is now awaiting moderation. You will be notified via email when the author replies to your comment. You can add your comment about this article using the form below.
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Allow more or less arbitrary input and try to parse the user input in a meaningful way. An application should allow that, and try to parse it correctly. Use the Validating event to validate input. This is automatically triggered whenever the user leaves the input control, i. But do not use the KeyPress or TextChanged events to do validation. The first will disturb the users when entering text. The second will also annoy them when they try to paste text from somewhere else. Imagine the following: I am trying to copy an number from a website.
Unfortunately, the text I have copied includes something else, too, e. Now, the application must give me the chance to paste and correct the text. If I am not allowed to do that, the application is a UX failure. The fastest way for validation is using regular expressions.
They are harder to understand but offer better performance. But you could do it also using string functions. Which is easier if you don't know regex but is less performant. This could be a viable option, depending on how hard the validation is. Here and here are some posts that will help you with code samples. Agreed that Regular Expressions might be faster, but Basically, this code is for a UserControl which contains a label, a text box, and an error provider.
It also has various other properties, but here's the bit which deals with validation. I do use this on the TextChanged event, because I don't want the user to continue typing if it's an invalid character; the rule checking "eats" the invalid character.
Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Text box validation Ask Question. Asked 10 years, 5 months ago. Active 4 years, 2 months ago.
Viewed 24k times. Harish Harish 3 3 gold badges 5 5 silver badges 11 11 bronze badges. Add a comment. Active Oldest Votes. Wow, this can be a very broad topic IndexOf e. Schenz Schenz 1, 8 8 silver badges 14 14 bronze badges.
Performing validation in the KeyPress event is a serious UX flaw read my answer for details. Yes, after reading your answer I will admit your solutions are much better in terms of UX. Thank you for writing that answer to clarify the comment. I do like your approach much better! Harish: you should not have accepted my answer.
Konrad Rudolph's approach is much better than mine in terms of technical correctness, and to offer a better User Experience UX. There are multiple values to handle this: Use a NumericUpDown or a Slider control instead of a text box for numeric values in other words: use the correct control instead of a general-purpose control.
Granted, this is the hardest way, but it provides the best user experience. The MSDN documentation of the event gives an example of how this event is used correctly. Konrad Rudolph Konrad Rudolph k gold badges silver badges bronze badges. Chip Hunt Chip Hunt 7 7 bronze badges. Liviu Mandras Liviu Mandras 6, 1 1 gold badge 38 38 silver badges 61 61 bronze badges.
Object, ByVal e As System.