Property Modifier

Question

I have a property with read/write capability. This particular property points to the log file.  What I wanted to know is what is the best modifier to attach to my property "set," so that no one can modify it? 

 

Example:

 

public static string writeToFile { get; internal set; }

 

or

 

public static string writeToFile { get; protected set; }

 

Is one of these better than the other? Or is there a better way to protect set?