asp.net - Gridview overriding my existing data -


i using textbox item name , gridview displaying data. trying achieve here user enter item name in textbox. retrieving data database , displaying in gridview. more user can add multiple item. first item display when try add item gridview override it. want existing data should same , in scenario using textbox enter item , retrieve data database , display girdview when again enter item , retrieve data override existing data want existing data should remain in girdview there way can that.


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