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I add the CheckBox inside the header of the coulmn's gridview such as in this link ASP.NET.4GuysFromRolla.com: Checking All CheckBoxes in a GridView Using Client-Side Script and a Check All CheckBox and it work but when i add the checkboxs in multiple colum not work

The code below copy SQL result from ORACLE database to ACCESS database at the first time but other times duplicate data , when i assign key to the Target table , the compiler give a error message "The changes you requested to the table were not successful because they would create duplicate...