Singleton pattern in c#.net is this correct way?

public sealed class GetDBInstance
    {
        private static readonly object padlock = new object();
        private static DBCon _ObjInstance;

        public GetDBInstance() { }

        public static DBCon InstanceCon
        {

            get
            {
                if (_ObjInstance == null)
                {
                    lock (padlock)
                    {
                        if (_ObjInstance == null)
                            _ObjInstance = new DBCon();
                        _ObjInstance.strConnection = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;

                    }
                }
                return _ObjInstance;
            }
        }
    }

public class DBCon
    {
      public string strConnection { get; set; }
    }