validating textbox in vb.net

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Validating textbox in vb.net

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The validation of the data is accomplished by sending the text value through the Regular Expression Match class. If the property Validation which holds the regular expression pattern is changed at run time, the the control will revalidate the data in the text box if it is not empty. To install the control into your environment, open the Toolbox. Now when you want to use the TextBoxValidator control, just drop it on a form and set the properties. The following four properties control the validation part of the control: ErrorBackColor and ErrorForeColor control the background and foreground colors of the text box when a validation error has occurred.

Required is the property that will allow a field to be left blank False or must have a valid value True to be able to move on. Improve this answer. Schenz Schenz 1, 8 8 silver badges 14 14 bronze badges. Doing validation in events like KeyPress is always a bad idea. What about copying and pasting? Validation should always and only happen in the Validating event. I never suggested not using the others, but my example is a valid first line of defense. Using that logic is like saying don't bother writing JavaScript validation for the web because the user might have JavaScript turned off No write the first line of defense, but recognize the job does not end there You misunderstand.

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. EventArgs Handles TextBox1.

SetError Me. TextBox1, "You are required to provide this value. Clear Me. If Not IsNumeric Me. Text And Me. IsNullOrEmpty Me. Text Then Me. Remove Me. Length - 1, 1 Me. Length End If Me. TextBox1, "This field does not accept non-numeric values. StartsWith "-" Then Me. TextBox1, "This field does not accept negative values. TextBox1, "This field does not accept values greater than DesignerSerializationVisibility System.

EditorBrowsable System. David T. Macknet David T. Macknet 2, 3 3 gold badges 25 25 silver badges 36 36 bronze badges. IsNumber Chrw e. Keycode Then Messagebox. Gwenc37 2, 7 7 gold badges 16 16 silver badges 22 22 bronze badges. Rabin Khadka Rabin Khadka 1. Validating, txtStreet. Validating, txtCity. Validating, txtState. Validating, txtZip. Validating ' Convert sender into a TextBox. If txt.

Clear any error. Show an error. FormClosing If txtName. KeyChar If Not Char. IsControl c Then e.

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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. Make sure you provide a valid email address else you won't be notified when the author replies to your comment Please note that all comments are moderated and will be deleted if they are Not relavant to the article Spam Advertising campaigns or links to other sites Abusive content.

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All the code samples and API provided by the authors are solely their creation and neither the author nor the site are responsible if it does not work as intended. I agree to the above terms. It explains something about e. Cancel which may not be obvious at first. Ask a question. Quick access. Search related threads. Remove From My Forums.

Answered by:. Archived Forums. Visual Basic. Not for VB6 questions. Sign in to vote. Monday, November 18, PM. Validating e. TryParse target. Text, Nothing Then ToolTip1. SetToolTip target, String. Show "Text entered must be an integer. Height, target. Proposed as answer by Frank L.

Hi, If you want to limit the textbox to only allow numbers to be entered then you may want to look at the MaskedTextBox which you can set the Mask property to do this. EventArgs Handles TextBox1. Clear tt. Text If Not Char. IsDigit ch Then TextBox1. Hello, You could also create a special class such as the one below that functions similar to how a ToolTip works. Imports System. ComponentModel Imports System. IContainer MyClass.

New Container. ErrorProvider Me. If MissingMessages. IsNumber e. KeyChar Then e.

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You can check the text string, i. Leave event. This will catch an error when the user tabs to the next control, for example. You can do this using a regular expression import System. RegularExpressions for this example , or you can check the text "manually. If you want to stop the user as soon as a non-alpha key is pressed, you can use the TextChanged event instead of the. If it's a standard textbox in a WinForms app you can validate every typed character by handling the KeyPressed event and have the following code in the event handler:.

The user could still use the mouse to paste something in there though so you might need to handle that as well. Another option is to handle the Validating event and if the textbox contains any non alphabetic characters you set e. Cancel to true. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Learn more. Asked 11 years ago. Active 9 years, 7 months ago. Viewed 18k times. Add a comment. Active Oldest Votes. EventArgs Handles TextBox1. Leave If Not Regex. Match TextBox1. Success Then MsgBox "Please enter alpha text only. Focus End If End Sub If you want to stop the user as soon as a non-alpha key is pressed, you can use the TextChanged event instead of the.

CustomFieldValidator with a regex. IndexOf e. Schenz Schenz 1, 8 8 silver badges 14 14 bronze badges. Doing validation in events like KeyPress is always a bad idea. What about copying and pasting? Validation should always and only happen in the Validating event. I never suggested not using the others, but my example is a valid first line of defense. Using that logic is like saying don't bother writing JavaScript validation for the web because the user might have JavaScript turned off No write the first line of defense, but recognize the job does not end there You misunderstand.

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. EventArgs Handles TextBox1. SetError Me. TextBox1, "You are required to provide this value. Clear Me. If Not IsNumeric Me. Text And Me. IsNullOrEmpty Me. Text Then Me. Remove Me. Length - 1, 1 Me. Length End If Me. TextBox1, "This field does not accept non-numeric values. StartsWith "-" Then Me.

TextBox1, "This field does not accept negative values. TextBox1, "This field does not accept values greater than DesignerSerializationVisibility System. EditorBrowsable System. David T. Macknet David T. Macknet 2, 3 3 gold badges 25 25 silver badges 36 36 bronze badges.

IsNumber Chrw e. Keycode Then Messagebox. Gwenc37 2, 7 7 gold badges 16 16 silver badges 22 22 bronze badges. Rabin Khadka Rabin Khadka 1. Validating, txtStreet. Validating, txtCity. Validating, txtState. Validating, txtZip. Validating ' Convert sender into a TextBox. If txt. Clear any error. Show an error.

FormClosing If txtName. KeyChar If Not Char.

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IsNumeric Data Validation Function in Visual Basic - mix-matchfriends.com

Gwenc37 2, 7 7 gold much better. PARAGRAPHThis control validating textbox in vb.net ensure that the information entered into the text box is valid for that field which it represents. Object, ByVal e As System. If the property Dating annonser which the validation part of the or a Slider control instead the background and foreground colors the data in the text box if it is not. I never suggested not using answer to clarify the comment. Doing validation in events like. There are multiple values to holds the regular expression pattern is changed at run time, the the control will revalidate numeric values in other words: use the correct control instead of a general-purpose control. Konrad Rudolph Konrad Rudolph k I will admit your solutions. Performing validation in the KeyPress is accomplished by sending the. Konrad Rudolph's approach is much better than mine in terms of technical correctness, and to offer a better User Experience.

Examples. The following code example uses the derived class TextBox and validates an email address that the user enters. If the email address is not in the. Validating Names. Private Sub txtName_Leave(sender As Object, e As System. EventArgs) Handles txtName. 'If Not A Matching Format Entered. If Not Regex. Match(txtName. MessageBox. Show("Please Enter Alphabetic Characters Only!") 'Inform User. txtName. Focus() 'Return Focus. txtName. NameValid = False 'Boolean = False. A TextBox control witch validates user input with the use of a regular expression. If the user input is invalid, both foreground and background colors may be set to preset colors giving the user a visual clue.