I have a security method I would like to be able to sprinkle into other classes throughout my program. It is currently an abstract class but I feel it would be more appropriate as an interface. Can someone help me convert it? I wasn't able to call PrincipalIdentity() the same way I could with it being abstract.public abstract class SecurityBase {        public GenericPrincipal PrincipalIdentity() {            WindowsIdentity windowsIdentity = WindowsIdentity.GetCurrent();            string authenticationType = windowsIdentity.AuthenticationType;            string userName = windowsIdentity.Name.Split('\\')[1];;            GenericIdentity authenticatedGenericIdentity = new GenericIdentity(userName, authenticationType);            string[] Roles = //generate array;                GenericPrincipal pr = new GenericPrincipal(authenticatedGenericIdentity, Roles);            return pr;        }    }
Convert this abstract class to an interface
c#;security;interfaces;abstract class