✅ Getting duplicates out of a list

Hey, I have a C# code where I have a list of byte arrays (which are extracted from Images of a folder and I don‘t know how many there are - ps. They are too many - the code I wrote the Program in was in Windows forms) and there are duplicates in it, but I don’t know how get the duplicates out of the list dynamically. I couldn’t find a really good solution that does what I want. Thanks for help!