File used by another Process Exception

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C#

XML

Windows

I have 2 C# .net applications, One application (lets say App1) writes data to xml file and the second application (lets call it App2) reads data from the same xml file and updates itself. The App2 continuously monitors for the changes in xml file, for which I am using FileSystemWatcher. As soon as the App1 completes writing to the file, the App2 reads the changes. I made sure my App2 is reading the xml only with Read access but still sometime my App1 throws an exception with
"The process cannot access the file 'C:\xmlFile' because it is being used by another process". Here is my code snippet in App2 which is reading the file.

using (var stream = File.Open(filePath,FileMode.Open,FileAccess.Read))
               using (XmlReader reader = XmlReader.Create(stream))
               {
                   while (reader.Read())
                   {
                       // Only detect start elements.
                       if (reader.IsStartElement())
                       {
                           switch (reader.Name)
                           {
                               case "Component":
                                   fileElements.ComponentName = reader["Name"];
                                   fileElements.DateRun = reader["DateRun"];
                                   fileElements.Passed = reader["Passed"];
                                   break;
                           }
                       }
                   }

                   if (filePath.ToLower().Contains("ebsserver"))
                   {
                       UpdateDataTable1(fileElements);
                   }
                   else if (filePath.ToLower().Contains("ebsui"))
                   {
                       UpdateDataTable2(fileElements);
                   }
                   else
                   {
                       UpdateDataTable3(fileElements);
                   }
               }