Asp net validating date field
The regular expression is set in the Validation Expression property.The following table summarizes the commonly used syntax constructs for regular expressions: The Custom Validator control allows writing application specific custom validation routines for both the client side and the server side validation.
In such situation, a need might arise for performing validation separately for separate group.Figure 1: Test Application in Use The Code The code is very simple and does not require much of an explanation.All that is done is to split the date string up into month, day, and year, and then to attempt to create a date time value from those parts.The server side validation routine must be called from the control's Server Validate event handler. The basic syntax for the control is as given: The Validation Summary control does not perform any validation but shows a summary of all errors in the page.The server side validation routine should be written in any . The summary displays the values of the Error Message property of all validation controls that failed validation.The time field will allow input starting with 'hh:mm' following by an optional 'am' or 'pm'. The code behind the form is as follows: For each field in the form (first the dates, then the time field), a check is made as to whether the input is blank.
If not, the input is compared to the regular expression.
The following example describes a form to be filled up by all the students of a school, divided into four houses, for electing the school president.
Here, we use the validation controls to validate the user input.
If the operation succeeds, the method returns true, if it fails (with an invalid date) the failure is trapped in a catch block which in turn returns a false.
One annoying task that most every developer has had to face in the past is form validation.
NET includes six validation controls that you can use to simplify the entire validation process.