Zmiana pola danego elementu listy

class UploadMethodAccount
{
	public string _login { get; set; }
	public string _password { get; set; }
	public bool _active { get; set; }

	public UploadMethodAccount(string login, string password, bool active)
	{
		_login = login;
		_password = password;
		_active = active;
	}
}}

List<UploadMethodAccount> uploadMethodAccountList = new List<UploadMethodAccount>();

uploadMethodAccountList.Add(new UploadMethodAccount(loginLineWithoutL, passwordLineWithoutP, true));

getUploadMethodEmails()[1]._login = "newLoginForIndex1";

MessageBox.Show(getUploadMethodEmails()[1]._login);

private List<UploadMethodAccount> getUploadMethodEmails()
{
	List<UploadMethodAccount> uploadMethodAccountList = new List<UploadMethodAccount>();
	using (StreamReader sr = new StreamReader(file))
	{
		string line;
		while ((line = sr.ReadLine()) != null)
		{
			//operacje na pliku
			uploadMethodAccountList.Add(new UploadMethodAccount(loginLineWithoutL, passwordLineWithoutP, true));
		}
	}
	return uploadMethodAccountList;
}