So in this way we can simply use Required field, password, email or phone number validation in VB.NET. If any number is in this format then application will show “valid phone number” otherwise it will show “Phnum Should 10 Digits and Format +91-xxxxxxxxxx”. Īnd it will check if the entered password contains at least 6 characters (?=. Set the Icon for errorprovider1 (warning), errorprovider2 (wrong or cross. I have also created a button but there is no use for it (in the example). Set text boxes are named txtname and txtage. The easy way is to use a regular expression to check the entered password is valid or not. Place two text boxes (for getting name and age) and three ErrorProvider controls from the toolbox. If Not Regex.IsMatch(TextBox2.Text, MatchNumberPattern) Then and Valid special characters are – (Passwords like ‘ ‘ etc are the valid password entries according to the following code.) Private Sub Button1_Click(ByVal Sender As Object, _īyVal e As System.EventArgs) Handles Button1.Clickĭim MatchNumberPattern As String = "" Then It must contain at least one lower case letter, In this example, we can validate passwords with the help of Regular Expression. We can also use this code for giving the validation on the username or other required textboxes which we don’t want to be left empty. If String.IsNullOrEmpty() ThenĮpName.SetError(txtName, "Name is required.") Private Sub txtName_Validating(sender As System.Object, e As ) Handles txtName.Validating If the TextBox is empty an error message is set in the ErrorProvider control so with the help of Validating event handler, the TextBox is validated for Empty and White space, and if the validation fails it shows the error message. The validation of TextBox will be performed using the Validating event handler and the error message will be displayed using the ErrorProvider control in Windows Application (WinForms) using VB.Net. The form will either alert the user that they have done something wrong and need to correct something to proceed, or the form will be validated and the user will be able to continue with their process. The first thing we will explore is how to validate when the user click on a button (like a Save or a OK button). What is “Form Validation”?įorm validation is a “technical process where a web-form checks if the information provided by a user is correct or not.” In this Visual Basic tutorial, let’s perform some real-time examples to validate email, password, Phonenumber and required input fields in VB. How to Validate the Email, Password, Phonenumber and make any input fields required or mandatory in Visual Basic(VB.Net)
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