Validating in vb net
The most important thing to understand about this answer is that I didn't write the regular expression myself.There are just so many wrong ways that seem to be right, and there are several levels of detail that you could take this to.The Validate event and the accompanying Causes Validate property are new to VB6 and give programmers a much-needed replacement for older, more cumbersome techniques of field validation.(See the section in this chapter entitled "Validation With Got Focus and Lost Focus Events".) In general, the best time to validate a field's contents is when the user attempts to leave the field.Therefore, it would help to take a look at the properties and the methods of this base class, which are common for all the validation controls: The Regular Expression Validator allows validating the input text by matching against a pattern of a regular expression.The regular expression is set in the Validation Expression property. Here I am giving the code snippet to validate your password in Server Side Using First create a textbox and one button for the user input as below Write the below code snippet into your button click Dim password As String password = Trim(txtnewpassword.
Resume Layout(False) End Sub #End Region Private Sub Text Box1_Text Changed(By Val sender As System.
Text) //Alphabet Array Dim Small Character() As String = Dim smallchacount As Integer = 0 For Each smallcha As String In Small Character If (password.
The Error Provider component displays an error icon ( ) next to the relevant control, such as a text box; when the user positions the mouse pointer over the error icon, a Tool Tip appears, showing the error message string.
Text Changed End Sub Public Sub Text Box1_Validating(By Val sender As Object, _ By Val e As System.
The validation control classes are inherited from the Base Validator class hence they inherit its properties and methods.
Even the expression in this answer is now very stale since it was originally authored.