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Posted by / 31-Oct-2020 08:01

Asp net validating date input

If one or more fields are empty then the program displays a message to the user that all fields must be filled in before the program can validate the input information.The code above calls the first Name Text Box's Focus method to place the cursor in the first Name Text Box.If there are no empty fields, then the following code validates the first name by calling the static method Match of the Regex class, passing both the string to validate and the Regular Expression as arguments. This object contains a Success property that indicates whether a method Match's first argument matches the pattern specified by the Regular Expression in the second argument.If the value of Success is false (i.e., there was no match), then it displays an error message and sets the focus back to the first Name Text Box so that the user can retype the input and terminate the event handler.If there is a match, then the event handler proceeds to validate the first name.This process continues until the event handler validates the user input in all the Text Boxes or until a validation fails.Before we look at the code sample, I would like to provide a little explanation of Regular Expressions.Regular Expressions are specially formatted strings for specifying patterns in text.

You need to check the Is Valid property to know if a validation check failed.This article explains how to use Regex in a Windows application.The code example uses Regular Expressions in C# to validate name, address, and telephone number input by a user.The complete listing for Web Form1cs is shown below. You can disable any of the validation controls by setting the Enabled property to false. Html Controls; namespace Web Data Validation When the user clicks the Cancel button we clear the Text Box control and allow the user to start over.

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