This article has code snippets used to work with People editor in ASP.NET and SharePoint;
Using Sharepoint TAG
<%@ Register Tagprefix="SharePoint" Namespace="Microsoft.SharePoint.WebControls" Assembly="Microsoft.SharePoint, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<SharePoint:PeopleEditor runat="server" ID="peopleEditor"
AutoPostBack="true" AllowEmpty="false" SelectionSet="User,SecGroup,SPGroup"
BorderWidth="1" PlaceButtonsUnderEntityEditor="false" Rows="1" />
Using C#
PeopleEditor pplEditor = new PeopleEditor();
pplEditor.ValidatorEnabled = true;
Panel1.Controls.Add(pplEditor);
for (int i = 0; i < pplEditor.ResolvedEntities.Count; i++)
{
PickerEntity picker = (PickerEntity)pplEditor.ResolvedEntities[i];
Hashtable hstEntityData = picker.EntityData;
string accountName = Convert.ToString(hstEntityData["AccountName"]);
string emailID = Convert.ToString(hstEntityData["Email"]);
}
//Load peopleEditor values from Aprovadores
if (oItemAtivo["Aprovador_x0028_es_x0029_"] != null)
{
string users = string.Empty;
SPFieldUserValueCollection userCol = new SPFieldUserValueCollection(oWeb, oItemAtivo["Aprovador_x0028_es_x0029_"].ToString());
foreach (SPFieldUserValue usrItm in userCol)
{
users += usrItm.User.ToString() + ",";
}
peopApp.CommaSeparatedAccounts = users.Remove(users.LastIndexOf(","), 1);
}