How to use SharePoint People Editor?

Designer:

<SharePoint:PeopleEditor ID="peopelID" runat="server" Width="350px" SelectionSet="User"
  MaximumEntities="1" MultiSelect="false" AllowEmpty="false" DoPostBackOnResolve="true"
   ErrorMessage="Type and press the enter key." ValidatorEnabled="true" ForeColor="Blue" >

</SharePoint:PeopleEditor>

Code:

To check if the control contains value:

if (peopelID.ResolvedEntities.Count > 0)

                {Do something...}

To clear the control:

peopelID.CommaSeparatedAccounts = null;

To read value:

PickerEntity picker = (PickerEntity)peopelID.ResolvedEntities[0];

Hashtable hstEntityData = picker.EntityData;

strWorkEmail = Convert.ToString(hstEntityData["Email"]);


CSS:

The control may look different based on the master page being used. So, you may need to use browser's developer tools to look for the style(s) to be changed.