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There are two main reasons that Web caches are used: If you examine the preferences dialog of any modern Web browser (like Internet Explorer, Safari or Mozilla), you’ll probably notice a “cache” setting.

This lets you set aside a section of your computer’s hard disk to store representations that you’ve seen, just for you.

Whether it's a search form, a login screen or a multi-page registration wizard, Tapestry uses standard HTML forms, with HTTP POST actions by default.

When I debugged the code i saw that this error happens when the username is undefined.

Sure there have been all kinds of whacky plug-ins over the years aimed at achieving this, but never a single standard that we could work towards.

For a more detailed introduction to HTML5 form validation you can find some great articles linked under References below.

Different browsers may mark the input box in some way (Firefox 4 Beta adds a red box-shadow by default), display a warning (Opera) or even prevent the form from being submitted if this field has no value.

Hopefully these behaviours will converge in future releases.

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For developer point of view serve side is preferable because it will not fail, it is not dependent on browser and scripting language. NET validation, which will ensure client, and server validation. When the value of the Causes Validation property is set to true, you can also use the Validation Group property to specify the name of the validation group for which the Button control causes validation. Compare Validator Control The Compare Validator control allows you to make comparison to compare data entered in an input control with a constant value or a value in a different control.

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