textbox character countdown asp.net

i have many textboxes on a form and all textboxes require to have a character limit / c开发者_高级运维haracter countdown (50 character left of 150), what is the best way to achieve this and can anyone please provide code to implement.

Much Grateful

Thanks

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couple raw ones: http://www.smartwebby.com/DHTML/textbox_characters_counter.asp http://www.reconn.us/character_counter.html

and one for jquery as a plugin: http://plugins.jquery.com/taxonomy/term/360