User selector 
This article demonstrates how to add a User selector in a widget's designer view. For more information about users in Sitefinity CMS, see Overview: Users. 
 PREREQUISITES: To use the selector, must have at least one user created. For more information, see Administration: Create and delete users.
To add a User selector, in your DesignerView.YourView.cshtml file, place one of the following tags anywhere in the HTML code:
Single item selection:
Multiple items selection:
The values of the attributes are scope properties that you define in the MVC widget controller.
    
    
        
            | Attribute | Description | 
        
            | sf-selected-item-id | Single select only. Stores the ID of the selected item. | 
        
            | sf-selected-item | Single select only. Stores the serialized information of the selected item. | 
        
            | sf-selected-ids | Multi select only. Stores the IDs of the selected items. | 
        
            | sf-selected-items | Multi select only. Stores the serialized information of the selected items. | 
        
            | sf-provider | Configures the provider to use when retrieving the items to display. |