duplicate name not allow

Member 9511889

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11 Jan 2013CPOL

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i have 'user' table:fields are:nameemailidaddressph.nopasswordwhen i insert new data from textbox,it will check whether name is allready exsist or not .if not exsist then allow to enter name in textbox.how to do this?more discription of my problem:when i enter...

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Compare	Revision	Minor	Date	Status	Editor
	3 - publicly available	No	11-Jan-13 22:39	Available	Member 9511889
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	2	No	11-Jan-13 21:46	Available	Member 9511889
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	1	No	11-Jan-13 21:34	Available	Member 9511889

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duplicate name not allow

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