установить свойство редактора людей, как показано ниже: -
//Declaring PeopleEditor object
PeopleEditor ctrlpplPicker = new PeopleEditor ();
//Defining properties of the PeopleEditor
ctrlpplPicker.AutoPostBack = false;
ctrlpplPicker.PlaceButtonsUnderEntityEditor = true;
ctrlpplPicker.ID = "pplEditor";
ctrlpplPicker.AllowEmpty = false;
ctrlpplPicker.SelectionSet = "User, DL, SecGroup, SPGroup";
ctrlpplPicker.MultiSelect = true;
ctrlpplPicker.MaximumEntities = 5;