Validating event of text box in vb net
A programmer can evaluate the state of the data at that point and react to any error in the data either by: Listing 5.4 illustrates the use of the Validate event procedure to perform validation and to decide whether or not to keep focus on the current control.LISTING 5.4 USING THE VALIDATE EVENT PROCEDURE Private Sub txt Age_Validate(Cancel As Boolean) If Not Is Numeric(txt Age.
Next step is to choose the way Super Validator performs validation.
That is done by setting Validation Type property as shown in image below: These properties allow you to define 3 level validation for each control.
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For example you can require the input for text-box and enforce the format to be an email by assigning Validation1 and Validation2 properties.
Select control you want to assign validation to and change its Validator1 property to choose desired validation type.
Validation starts with Validator1, Validator2 and finally Validator3.
You can assign one of these properties or all of them if you need to perform multi-level validation.
You can read more about regular expressions in MSDN starting at following URL: Regular Expression Validator is assigned to input field it looks like this in property grid: Super Validator component includes Comparison Validation that allows you to compare values of two input fields or to compare input field value to a predefined value you set.
However, control never enters the "if" block in the below use case: 1. (which means error Provider1 will have "Password invalid!
In previous example you’ve seen required field validator.Tags: Adult Dating, affair dating, sex dating