What can I do with a protected/private static variable?

Question

I see I can write :

protected static

in my C# class (in my case, an aspx.cs). As well as :

private static

Answer 1

private
The type or member can only be accessed by code in the same class or struct.
protected
The type or member can only be accessed by code in the same class or struct, or in a derived class. Static Modifier
Static methods are called without an instance reference.