Custom type converter for converting between MongoDB.Bson.ObjectId and string

gistfile1.cs

public class ObjectIdConverter : TypeConverter
{
    public override bool CanConvertFrom(ITypeDescriptorContext context, 
                                        Type sourceType)
    {
        if (sourceType == typeof(string))
            return true;
        return base.CanConvertFrom(context, sourceType);
    }

    public override object ConvertFrom(ITypeDescriptorContext context,
                                       System.Globalization.CultureInfo culture,
                                       object value)
    {
        if (value is string)
            return MongoDB.Bson.ObjectId.Parse((string)value);
        return base.ConvertFrom(context, culture, value);
    }

    public override bool CanConvertTo(ITypeDescriptorContext context,
                                      Type destinationType)
    {
        if (destinationType == typeof(string))
            return true;
        return base.CanConvertTo(context, destinationType);
    }

    public override object ConvertTo(ITypeDescriptorContext context, 
                                     System.Globalization.CultureInfo culture,
                                     object value,
                                     Type destinationType)
    {
        if (destinationType == typeof(string))
            return ((MongoDB.Bson.ObjectId)value).ToString();
        return base.ConvertTo(context, culture, value, destinationType);
    }
}