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This is the exact position the error message will appear if validation 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.For this first example we do not need to place much code into the code-behind file. We want to make sure a user enters a hire date, the date is in a valid format, and the data is within one week (plus or minus) of today’s date. To Short Date String(); } } Notice we are setting a Display property for the Range Validator.The associated control is set by right clicking on the validator and selecting Properties from the context menu. The Range Validator control ensures the value inside a control is within a specified range.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. There are four key properties to initialize for a Range Validator.
Before accepting data from over the network you need to ensure all of the required fields have been filled out and conform to your formats and business rules. NET provides a number of validation controls to ease the burden of performing validation on both sides of the network. To walk along with the example, create a new web application in Visual Studio . Once the application is setup, right click on the empty web form, select Properties from the context menu, and change the Page Layout property to Flow Layout. All of the validation controls must have the Control To Validate property set before rendering the page or the control throws an exception.
Place four controls from the Web forms section of the Toolbox onto the form. The one exclusion to this rule is the Custom Validator component.
The cancel button has a Causes Validation property. The Control To Validate property references the ID of the input control to check.
Validation occurs when a user clicks any Button control by default, but you can change this behavior by setting the Causes Validation property to false. The Minimum Value and Maximum Value properties control the allowed range of the input. This property can take one of the following values: String, Integer, Double, Date, or Currency.
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). You can validate the following server controls: Text Box, List Box, Drop Down List, Radio Button List, and the following HTML controls: Html Input Text, Html Input File, Html Select, and Html Text Area.
This Required Field Validator forces the user to enter text into the control associated with the validator. We have seen the Required Field Validator in our first sample program, let’s move on to examine the rest of the controls.