FileInUse function

using System.Security.Permissions;
using System.IO;



public static bool FileInUse(string filePath)
        {
            try
            {
                if (!File.Exists(filePath))
                {
                    return true;
                }
                new FileIOPermission(FileIOPermissionAccess.Write, filePath).Demand();
                using (new FileStream(filePath, FileMode.Append))
                {
                    return false;
                }
            }
            catch (AccessViolationException)
            {
                return true;
            }
            catch (IOException)
            {
                return true;
            }
        }
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