public override string ToString()
{
var hasStart = !string.IsNullOrWhiteSpace(StartYear);
var hasEnd = !string.IsNullOrWhiteSpace(EndYear);
if (hasStart && hasEnd)
{
return($"{StartYear.Trim()}-{EndYear.Trim()}");
}
else if (hasStart)
{
return(StartYear.Trim());
}
else if (hasEnd)
{
return(EndYear.Trim());
}
return("Unknown");
}