C#.NET - Check whether file closed

if (!IsFileClosed(sLocalCurrentDocumentPath))

{

MessageBox.Show("Document opened already..!", clsCommon.sProjectName, MessageBoxButtons.OK, MessageBoxIcon.Information);

return;

}

public static bool IsFileClosed(string filename)

{

try

{

using (var inputStream = File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.None))

{

                    return true;

            }

}

catch (IOException)

{

return false;

      }

}