Setting the default value of a C# Optional Parameter

Question

Whenever I attempt to set the default value of an optional parameter to something in a resource file, I get a compile-time error of

Default parameter

Answer 1

Another option is to split your method into two, and have the one overload call the other, like so:

public void ValidationError(string fieldName)
{ 
    ValidationError(fieldName, ValidationMessages.ContactNotFound);
}

public void ValidationError(string fieldName, string message)
{
    ...
}

This way also enables you to pass null as a value for message in case that is also a valid value for that parameter.