public struct student
{
    private string username;
    private string password;

    public string Username
    {
        get { return username; }
        set { username = value; }
    }

    public string Password
    {
        get { return password; }
        set { password = value; }
    }

    public student(string username, string password)
    {
        this.username = username;
        this.password = password;

    }

    public student(string username,string email,string phonenumber,string password)
    {
        this.password = password;
        this.username = email;
    }
}