C# - How To Validate A Duplicate Value Of Textbox In Asp.net While Submit Button

Jan 11, 2011

I have 3 text box's and a submit button when i enter the values and submit then values are entered in database .but when i enter the same values and enter then those values are also entered.......This should not happen...I need a popup window showing there are duplicate values that you have entered.

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Validate Duplicate Value Of Textbox While Submit Button

Dec 22, 2010

I have 3 text box's and a submit button when i enter the values and submit then values are entered in database but when i enter the same values and enter then those values are also entered.......This should not happen...I need a popup window showing there are duplicate values that you have entered.Please give the code for aspx and aspx.cs and data base.

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[code]...

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[Code]....

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[Code]....

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[Code]....

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