SharePoint List’s Person or Group field value as c# SPUser objet

Casting the list's Person or Group field value into SPUser object.

using(SPSite spSite = new SPSite("site URL"))
{
   using(SPWeb spWeb = spSite.OpenWeb())
   { 
      SPList spList = spWeb.Lists["List Name"];
      SPListItem spListItem = spList.GetItemByID(itemID);
      string currentValue = spListItem["Person or Group field name"].ToString();
     SPFieldUser userField = (SPFieldUser)spWeb.Lists["List Name"].Fields.GetField("Person or Group field name");
     SPFieldUserValue fieldValue = (SPFieldUserValue)userField.GetFieldValue(currentValue);
     SPUser user = fieldValue.User;

                                          OR

     SPFieldUserValue spFieldUserValue = new SPFieldUserValue(web ,  Convert.ToString(projectItem["Person or Group field name"]));
     SPUser user =  spFieldUserValue.User;
   }
}