Regular expression for validating date in asp net

05-Sep-2016 09:07 by 6 Comments

Regular expression for validating date in asp net - Online sex chat by image

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.

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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.

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.

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.

As we will see later in the code-behind file, the Cancel Button will clear all of the fields on the form, and we do not want to validate any of the fields when the user presses this button. The Range Validator will first try to convert the values it is examining into the type specified.

Notice in the following screen capture, we can see the Required Field Validator error message display on the form. If the conversion fails, the validation also fails.

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.

We can double click on both of the Button controls on the form to add event handlers for the click events. The code in our ASPX file should look like the following. The Display property can accept one of three values: None, Static, or Dynamic.

The complete listing for Web Form1cs is shown below. In the above example we have tied two validation controls to the Hire Date Text Box. If the Display property is set to None, no errors are displayed where the validation control is placed on the form.

Html Controls; namespace Web Data Validation { public class Web Form1 : System. As we mentioned earlier, validation controls execute when the user clicks a Button control, including HTML button controls and server button controls such as the Link Button and Image Button.

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