Auto increment value to PropertyList class

Hi Team,

I have a requirement to auto increment PropertyList class value. Can you please provide suggestions to acheive this? Below are the classes which i have created.

public class QuestionOption
{
private int _id;

[Required]
[Editable(false)]
public virtual int Id
{
get
{
return _id;
}

set
{
_id = value;
}
}

[Required]
public virtual string Name { get; set; }
}

/// <summary>
/// Selection base page
/// </summary>
public class SelectionBase : QuestionBasePage
{
/// <summary>
/// Gets or sets the options
/// </summary>
[Display(
GroupName = SystemTabNames.Content,
Name = "Options",
Order = 100)]
[EditorDescriptor(EditorDescriptorType = typeof(CollectionEditorDescriptor<QuestionOption>))]
public virtual IList<QuestionOption> Options { get; set; }
}