Get user name from a peoplegroup column “Sharepoint 2010”

public List<string> getUserNameFromPeopleGroup(SPListItem ListItem, string PeopleGroup, SPWeb objWeb)
{
List<string> strLoginName = new List<string>();
SPFieldUserValueCollection users = ListItem[PeopleGroup] as SPFieldUserValueCollection;
if (users != null)
{
foreach (SPFieldUserValue userVal in users)
{
if (userVal.User != null)
{
SPUser user = userVal.User;
strLoginName.Add(user.Name);
}
}
}
return strLoginName;
}