When validation fails the normal flow of execution continues.
All of the validation controls must have the Control To Validate property set before rendering the page or the control throws an exception.
The one exclusion to this rule is the Custom Validator component.
Validation is complete by the time you reach a click event.
There are various validation controls availabe, and we will cover them in the rest of the article.
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This Required Field Validator forces the user to enter text into the control associated with the validator. If you want to make sure the user changes a default value placed into the control, set the control’s Text value and the Initial Value property of the Required Field Validator to the same value.
The associated control is set by right clicking on the validator and selecting Properties from the context menu. The rest of the validation controls provided by ASP.
In the Properties dialog box find the Control To Validate property and select First Name Text Box from the drop down list. We can set other properties, such as the Error Message property, and the final ASPX source code should look like the following. NET work in a similar fashion to what we've seen above. If the client's web browser is of executing client side Java Script, the first validation pass occurs on the client.
The cancel button has a Causes Validation property. As we mentioned in the beginning of the article, validation can occur twice: once on the client’s machine and once on the server. Client side validation provides quick feedback for the user.
For this first example we do not need to place much code into the code-behind file. NET runtime does not waste time processing a request with invalid information.