fix event enum

uwp/cs/06_GroupChat/Controls/EventDisplay.xaml.cs

@@ -44,11 +44,11 @@ namespace _06_GroupChat.Controls
 					EventText.Text = $"The conference {eventLog.Subject} is terminated";
 					break;
 
-				case EventLogType.ConferenceCallStart:
+				case EventLogType.ConferenceCallStarted:
 					EventText.Text = "Call started";
 					break;
 
-				case EventLogType.ConferenceCallEnd:
+				case EventLogType.ConferenceCallEnded:
 					EventText.Text = "Call ended";
 					break;
 
@@ -76,4 +76,4 @@ namespace _06_GroupChat.Controls
 			}
 		}
 	}
-}
+}

uwp/cs/07_AdvancedChat/Controls/EventDisplay.xaml.cs

@@ -37,11 +37,11 @@ namespace _07_AdvancedChat.Controls
 					EventText.Text = $"The conference {eventLog.Subject} is terminated";
 					break;
 
-				case EventLogType.ConferenceCallStart:
+				case EventLogType.ConferenceCallStarted:
 					EventText.Text = "Call start";
 					break;
 
-				case EventLogType.ConferenceCallEnd:
+				case EventLogType.ConferenceCallEnded:
 					EventText.Text = "Call end";
 					break;
 
@@ -80,4 +80,4 @@ namespace _07_AdvancedChat.Controls
 			}
 		}
 	}
-}
+}