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HighscoreItem.cs

+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Text;
+using System.Xml;
+using System.Xml.Serialization;
+
+namespace App3
+{
+    public class HighscoreItem:INotifyPropertyChanged
+    {
+//        public int Index {get; set;}
+
+        [XmlIgnore]
+        public string Time { get; set; }
+
+        [XmlAttribute("Timestring", DataType ="duration")]
+        public string XmlTime
+        {
+            get { return Time; }
+            set { Time = value; }
+        }
+        public HighscoreItem()
+        {
+        }
+        public HighscoreItem ( string solvingTime)
+        {
+            //Index = scoreIndex;
+            Time = solvingTime;
+        }
+        public event PropertyChangedEventHandler PropertyChanged;
+        void OnPropertyChanged(string time)
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(time));
+        }
+    }
+}