Validating email c

You can validate the data as the data is entered in a control by reading the keys as they are pressed, or more commonly whenever the user takes the input focus away from one control and moves to the next.

This approach is useful when you want to give the user immediate feedback about the data as they are working.

If you need to require users to enter data in a well-defined format, such as a telephone number or a part number, you can accomplish this quickly and with minimal code by using the Masked Text Box control.

A is a string made up of characters from a masking language that specifies which characters can be entered at any given position in the text box. If the user types an incorrect entry, for example, the user types a letter when a digit is required, the control will automatically reject the input.

When you use data binding, the data in your control is synchronized with the data source during execution of the Validating event.

If you cancel the Validating event, the data will not be synchronized with the data source.

The following code example uses the derived class Text Box and validates an email address that the user enters. Length) ' Set the Error Provider error with the text to display. Set Error(text Box1, error Msg) End If End Sub Private Sub text Box1_Validated(By Val sender As Object, _ By Val e As System. Validated ' If all conditions have been met, clear the error provider of errors. Set Error(text Box1, "") End Sub When you change the focus by using the keyboard (TAB, SHIFT TAB, and so on), by calling the Select or Select Next Control methods, or by setting the Container Control.

If you cancel the Validating event, the behavior of the control will be determined by what value that you assigned to Auto Validate.Each control that accepts free-form user input has a Validating event that will occur whenever the control requires data validation.In the Validating event-handling method, you can validate user input in several ways. Regex(@"^[a-z A-Z][\w\.-][a-z A-Z0-9]@[a-z A-Z0-9][\w\.-]*[a-z A-Z0-9]\.[a-z A-Z][a-z A-Z\.]*[a-z A-Z]$"); //txtmail is name/object of textbox if (txtmail. Length 0){ //r EMail is object of Regex class located in System. Text)) The regex classes are located in the namespace System.

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