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Is it possible to add items to sorted list with the same value, because when I am trying to do so it shows me an error:
“An entry with the same key already exists.”
If it’s possible, then how?
It is not possible* to add duplicate keys as stated by other users.
In c# you might be able to use the Lookup class instead, which allows multiple values to be stored with the same key.
See: http://msdn.microsoft.com/en-us/library/bb460184.aspx
* It is possible, see comments, but only by defining a comparitor that never returns equality for equal items, which IMO is a really really bad idea.