![]() In a specified input string, replaces all strings that match a regular expression pattern with a specified replacement string. Splits an input string into an array of substrings at the positions defined by a regular expression pattern specified in the Regex constructor.įor the complete list of methods and properties, please consult Microsoft documentation.How to Validate the Email, Password, Phonenumber and make any input fields required or mandatory in Visual Basic(VB.Net) Public Function Split (input As String) As String() 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. 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 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. 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. 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. In this example, we can validate passwords with the help of Regular Expression.
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