C# (WinForms) - How to save authorization data (VkNet)?

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Recently I started to study VkNet, I did authorization - successfully, but it was necessary to make sure that authorization was in all forms, that is, if a person authorized in a form special for authorization, he did not need to authorize in others, and those forms performed the necessary VK API functions. Here is the code:

VkApi Vk = new VkApi();
    public void button1_Click(object sender, EventArgs e)
    {
        ulong appID = ...;
        string login = textBox3.Text;
        string password = textBox4.Text;
        Settings settings = Settings.All;


        Vk.Authorize(new ApiAuthParams
        {
            ApplicationId = appID,
            Login = login,
            Password = password,
            Settings = settings,
        });
    }