Only a compilation unit can have top-level units. Error

Question

Only a compilation unit can have top-level units. I couldn't find what caused this error. I don't know what this error means and if there is a solution. Can you help me? I am using Visual Studio Code with .NET9.0 version and C# coding language.

Answer 1

C# only support top level statements(code not contained in class definitions) in one file per project. These top level will be converted to main(){} statements at compile time. Typically it is the program.cs file.