How to add std::string to comboBox.Items in c++ WinForms?

Question

C++ / C#

How to add std::string to comboBox.Items in c++? WinForms
Writes: it is impossible to call a function with the given list of arguments, argument types: (std::string)
How can I add it?

Answer 1

combobox->Items->Add(gcnew String(str.c_str()));

Answer 2

comboBox.Items.Add(str);

Answer 3

Because I chose only those pictures that were in the document at the time of the call. The new picture was added later, so it was not included in this selection - well, it was not deleted, respectively.