C# Error CS0234 – The type or namespace name 'name' does not exist in the namespace 'namespace'

Exploring Namespace Structure

error CS0246: The type or namespace name 'PlayerData' could not be found

When are the following built-in exceptions raised? Give examples to support your answer. IOError - Computer Science (Python) | Shaalaa.com

7 Libraries for Reading and Writing from/to Excel File in C# - Developer Publish