Question

Is there any way in C# to specify a method that can be accessed only from derived classes of the same assembly without using internal access modifier?

Thanks.

Answer 1

Read about C# Protected Internal

protected A protected member is accessible within its class and by
derived classes.

internal Internal types or members are accessible only within
files in the same assembly.

protected internal Access is limited to the current assembly or
types derived from the containing
class.
* protected internal is the only access modifiers combination allowed
for a member or a type.

So you need to use internal key word after all:

protected internal memberName(){ ... };