Kiran Kumari

Kiran Kumari

  • NA
  • 142
  • 12.7k

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. 

Answers (3)