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. Whenever the user presses a button on the form, the script executes the validation checks for each validation control on the form.
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. If any one of the validation controls on a form fails, the script cancels the postback operation and displays error messages on the form.
When validation fails the normal flow of execution continues.
You need to check the Is Valid property to know if a validation check failed.
That may be too high for some people (but again, I think the reality is much lower), but I thought it was good context for people debating the virtues of less validation and more junk versus the alternative.For this first example we do not need to place much code into the code-behind file. NET runtime does not waste time processing a request with invalid information.We can double click on both of the Button controls on the form to add event handlers for the click events. If you want to disable just client side validation for a specific validation control, you can set the control’s Enable Client Script property to false. NET will always execute validation checks on the server when a button click event arrives requiring validation.Secondly, clearly we need something more decent and obviously it’s easy to replace the one in the validator or drop it into your C# as required. Oh – and just in case anyone is interested, here’s a dump of those 3,423 rejected email addresses (alpha chars substituted with “x’ for the sake of anonymity then distilled to a distinct list of 1,905 records).I grabbed Phil’s from the post above which looks like this: Huh? If, for argument’s sake, 10% of those are false positives (and I highly doubt it’s that high), we’re looking at 0.04% of the original dataset being invalid.