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Posted by / 24-Feb-2018 06:23

Simply put, never trust the data in an incoming request, and always validate on the server.When validation fails the normal flow of execution continues.Drag one Text Box control and give it an ID of First Name Text Box, two Button controls (Submit Button and Cancel Button), and one Required Field Validator (First Name Required Field Validator). The following screen shows the form in action, and the user has pressed the Submit button without entering any text into the textbox. The Required Field Validator fails when the value in the associated control matches the value of the Initial Value property of the Required Field Validator.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.If the conversion fails, the validation also fails.To demonstrate the Range Validator, we will add an additional Text Box control to our web form (Hire Date Text Box), and a Range Validator.There are four key properties to initialize for a Range Validator.

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.

In the above example we have tied two validation controls to the Hire Date Text Box.

The Range Validator does not validate the contents of an input control if the control is empty.

We have seen the Required Field Validator in our first sample program, let’s move on to examine the rest of the controls.

The Range Validator control ensures the value inside a control is within a specified range.

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