// Try to find if there is already a token for this username in order to remove it (used to create a new token for the user)
private void removePossibleToken(String username)
{
foreach (KeyValuePair <String, String> entry in TokenUser)
{
if (entry.Value.Equals(username))
{
String usernameRemoved;
TokenUser.TryRemove(entry.Key, out usernameRemoved);
break;
}
}
}
