How to decompile a C# program?

Question

C++ / C#

Good evening everyone, please tell me how to solve one problem I
made a window application in C # under windows for calculations,
now it became necessary to make changes, but the source codes were not saved,
can I somehow translate it back so that I can edit the code?

Answer 1

It's easy to google once you get started:
https://www.jetbrains.com/decompiler/

Answer 2

ILSpy

Answer 3

dnSpy

Answer 4

To get the source project, fix it and rebuild, you have to tinker, there are no such tools, but to get the source code of the assembly, please. Yes, the compiler.