---
title: Single or multiple list options
slug: cms-12/docs/single-or-multiple-list-options
docTags: 
createdAt: 2026-08-10T15:56:01.000Z
---

You can set up single or multiple selections from a list of predefined values by using the `SelectOne` and `SelectMany` attributes, located in the `EPiServer.Shell.ObjectEditing` namespace in the `EPiServer.UI` assembly. You can define these attributes on a property and require a reference to a class implementing the `ISelectionFactory` interface:

```csharp
[ContentType]
public class SamplePage: PageData {
  [SelectOne(SelectionFactoryType = typeof (LanguageSelectionFactory))]
  public virtual string SingleLanguage {
    get;
    set;
  }

  [SelectMany(SelectionFactoryType = typeof (LanguageSelectionFactory))]
  public virtual string MultipleLanguage {
    get;
    set;
  }
}

public class LanguageSelectionFactory: ISelectionFactory {
  public IEnumerable<ISelectItem> GetSelections(ExtendedMetadata metadata) {
    return new ISelectItem[] {
      new SelectItem() {
        Text = "English", Value = "EN"
      }, new SelectItem() {
        Text = "Swahili", Value = "SW"
      }, new SelectItem() {
        Text = "French Polonesia", Value = "PF"
      }
    };
  }
}
```

## Create your attributes

You should follow the DRY (Don't Repeat Yourself) principle and avoid adding references to the selection factory in many attributes by creating your attribute if you use them in several places. Inherit from the `EPiServer` attributes and override the `SelectionFactoryType` property as shown in the following example:

```csharp
[AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
public class LanguageSelectionAttribute: SelectOneAttribute {
  public override Type SelectionFactoryType {
    get {
      return typeof (LanguageSelectionFactory);
    }
    set {
      base.SelectionFactoryType = value;
    }
  }
}
```