David Brewer questions

• C# "An object reference is required for the non-static field, method, or property"
• Automatically increment filename
• "Cannot create an instance of the abstract class or interface" C# error message
• "Items collection cannot be modified when the DataSource property is set." [closed]
• Insert value into a string at a certain position?
• Pure virtual methods in C#?
• C# "must declare a body because it is not marked abstract, extern, or partial"

David Brewer answers