how to solve Exception:Call was rejected by callee. (Exception from HRESULT: 0x80010001 (RPC_E_CALL_REJECTED)) in C#?

Question

I have written a C# code in console application to open two excels and copy and paste data from one excel to another excel. It was working fine until the destination excel\'

Answer 1

Are you copying a range of information from one document to another, or are you going back and forth between the 2 documents copying cell by cell? Excel is single threaded, so if you go back and forth, it could cause this issue.