Binary data corruption

Hello all!

I'm trying to store in SQL Server 2017 binary value from C# bytes array. 

I have store it in BINARY field ContosoField via SqlTypes.SqlBinary parameter execution. Then, I want to get back my byte[] array using this: (byte[])ContosoFieldValue but I see another value in result. How to correctly store byte[] in SQL Server storage and get it back into byte[] in condition?

Thank you.