Get SPUser from sharepoint SPGroup

List<SPUser> usersLst = web.Groups[“GroupName”].Users.OfType<SPUser>().ToList<SPUser>();

How to fetch user from multi-valued column in ItemEventReceiver

if you have muli-valued column of type Person or Group, the afterpropeties will give results in the format

"9;#Admin;#11;#Reader;#13;#Contribute";

To get the username or group names from the above string format, use the below code.

  char[] separators = new char[] { ';', '#' };

  object objgroupNamesNew = properties.AfterProperties["UserGroup"];

  string gNew = Convert.ToString(objgroupNamesNew);

  string[] gpnameNew = gNew.Split(separators, StringSplitOptions.RemoveEmptyEntries);

  var groupNamesNew = gpnameNew.Where((gp, index) => index % 2 != 0);

  foreach (var grp in groupNamesNew)

            {

                Console.WriteLine(grp);

            }