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duplicate name not allow

Member 9511889 asked:

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i have 'user' table:
fields are:


when 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 name in textbox ,it will check weather name is exsist or not.if name exsist, then it will not allow to enter name.
Tags: C#, ASP.NET


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