For example, if you have a form that populates a drop-down list based on the value of another form field, server-side processing may be needed to pull data from a database and populate the drop-down list.Client-side validation provides validation within the browser on client computers through Java Script.Microsoft® Office Front Page® 2003 allows you to create some custom validation within the form feature.(For more information on how to create form validation using the Front Page form feature, see About creating forms in Front Page 2003.) However, if the form validation provided in Front Page does not suit your needs or the site on which you are working is hosted on a server that does not have Front Page Server Extensions from Microsoft installed, you may need to create custom form validation.The action attribute tells the browser what to do when a user submits the form.If you want to test this form, change this e-mail address to your own e-mail address.Server-side validation incorporates code validation into a form handler. NET application on the server that provides the functionality that your form needs for processing after a customer has submitted it.Because the code is stored on the server, server-side validation requires a roundtrip to the server.
Both Java Script and JScript are ECMAScript-compliant languages. for the next requirement of yours ie., for checking if it is 6 letters followed by 6 numbers, i suggest that u can use the regular expression validator control and get the text box validated. Say if u have a txt box labeled "txtuserid" and a label to display error "lbl Error" u can use the following function in java script to check the length and display error if the length is less than 12.In addition, this article assumes a general understanding of HTML and Java Script, although a thorough understanding is not required.For more information about HTML and Web scripting, see one or more of the following references.