In addition to the four validation controls we examined in this hour, there are two additional validation controls. The first is the CustomValidator, which is, as its name implies, a validation control that is customizable. The CustomValidator can be used to validate user input in a way that is not handled by one of the four validation controls we've looked at. However, in my experience, rarely will you find that you need to use a CustomValidator. More often than not, one of the main four validation controls will suffice. If, however, you find that you do need the power of a CustomValidator, I encourage you to read "Using the CustomValidator Control" at http://aspnet.4guysfromrolla.com/articles/073102-1.aspx. The other validation control is the ValidationSummary control. The ValidationSummary control lists the ErrorMessage properties for all of the validation controls on a web page that have indicated invalid user input data.
|