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Examples of inputs that cannot be validated are inputs that has no expected pattern (Example: An Html Text Area in which the user writes his opinion about your web site! Although you can force the user to input a minimum number of characters in this example, you cannot (at least using the validation controls we present in this tutorial) check whether his input is meaningful or not.

First of all, you have to decide what input you are going to validate.

Our article regarding, how to develop; make; create; use the ASP.

NET Validation Controls to Validate the User Input. It will check the target Id is not blank, means it will be mandatory field to form.

Some validation controls will need setting more properties as we will show in example 1.2 If you want to split the controls on your form into groups (with respect to validation), you can use the property Validation Group. Here we need the user to enter a value from 0 to 100 and we will show the associated grade, where 0 to 49 is associated with 'Poor', 50 to 70 is associated with 'Good', 71 to 90 is associated with 'Very Good', and 91 to 100 is associated with 'Excellent'.

We will need to make sure that the user had entered a value and to ensure that this value is between 0 and 100.

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It's 'Input Validation' what makes you that sure and lets you focus on the core of your application instead of wasting your time handling every case of input one by one.

In this tutorial we will provide you with step by step instructions regarding how to utilize these control to benefit from the validation features we mentioned before. only if you know exactly what will be the user input. No one (of course) can know exactly what will be the user input and if that happened then there is no need to make the user provide this input from the first place.

This is the case, you cannot validate all types of user inputs..

From the toolbox get a Text Box, a Label, a Button, a Range Validator, and a Required Field Validator and draw them on your form (Place the Required Field Validator control, and the Range Validator control to the side of the Text Box) In the properties window, set the following properties: Run the example and note that it does not accept values outside 0 ...

100 You may note that we set some properties that are specific to the validation control we used (like: Minimum Value, Maximum Value, Type).

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