I have a string property which allows user to select multiple enum options. I want to set the default option to 'Option1' for the string property.
Property allows multiple selections of the Enum but I want the default option to be set for 'Option1'

[Display(
Name = "options",
GroupName = SystemTabNames.Content,
Order = 30
)]
[SelectMany(SelectionFactoryType = typeof(EnumSelectionFactory))]
public virtual string Option { get; set; }

public override void SetDefaultValues(ContentType contentType)
{
base.SetDefaultValues(contentType);
Option = Forms.Option.Option1.ToString();
}


public enum Option
{
Option1 = 0,
Option2 = 1
}

public class EnumSelectionFactory : ISelectionFactory
{
public IEnumerable GetSelections(
ExtendedMetadata metadata)
{
var values = Enum.GetValues(typeof(TEnum));
foreach (var value in values)
{
yield return new SelectItem
{
Text = GetValueName((Enum)value),
Value = value
};
}
}

private string GetValueName(Enum value)
{
return EnumHelper.StringValueOf(value, true);
}
}