Kiran Kumari

Kiran Kumari

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How can i solve this Issue in windowsform?

Jul 25 2019 11:19 PM
hi everyone i am doing work on windows form , i got below error when i add items 
 
Item has already been added. Key in dictionary: '-1' Key being added: '-1'"} 
 
how can i solve this please guide me 
thanks in advance. 

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Answers (3)