public override string ToString()
{
var result = new StringBuilder();
foreach (var field in Fields)
{
if (RequiredFields.ContainsKey(field.Key))
{
result.Append($", {field.Value}");
}
else
{
result.Append($",{field.Key} {field.Value}");
}
}
result.Remove(0, 2);
result.Append(".");
return(result.ToString());
}