3
Answers

How can i solve this Issue in windowsform?

Kiran Kumari

Kiran Kumari
5y
735
1
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. 
Answers (3)
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