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If you have a webpart or a custom form where you use the SharePoint peoplepicker you have to fetch the values of the control to place them into SharePoint.
This is how you do this.




When I press the save button on my form this code I need to use:

string[] userarray = ppTechnicalManager.CommaSeparatedAccounts.ToString().Split(‘,’);
SPFieldUserValueCollection usercollection = new SPFieldUserValueCollection();
for (int i = 0; i < userarray.Length; i++)
item [“Technical Manager”]= usercollection;      
public SPFieldUserValue ConvertLoginAccount(string userid)
SPFieldUserValue uservalue;
SPSite site = new SPSite(SPContext.Current.Site.Url);
SPWeb web = site.OpenWeb();
SPUser requireduser = web.EnsureUser(userid);
uservalue = new SPFieldUserValue(web, requireduser.ID, requireduser.LoginName);
return uservalue;

And now the values will be saved into your list.

If you wwant to retrieve those values from your listitem again and display this into you control:

SPFieldUser userField = (SPFieldUser)list.Fields.GetField(Fields.TechnicalManager);
SPFieldUserValue fieldValue = (SPFieldUserValue)userField.GetFieldValue(item[Fields.TechnicalManager].CheckForNull());
ArrayList entityArrayList = new ArrayList();
PickerEntity entity = new PickerEntity();
if (fieldValue.User != null)
SPUser user = fieldValue.User;
entity.Key = user.LoginName.ToString();
SPGroup group = SPContext.Current.Web.Groups[fieldValue.LookupValue];
entity.Key = group.LoginName.ToString();

This checks for groups and users.

Hope this helps