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C# code to encode a string to its equivalent string representation that is encoded with base-64 digits.

private string EncodeBase64(string s)
        {
            try
            {
                byte[] ascBytes = System.Text.ASCIIEncoding.ASCII.GetBytes(s);
                return System.Convert.ToBase64String(ascBytes);
            }
            catch (Exception e) { throw new Exception(e.Message); }
        }

In an attempt to enhance user experience it may be desirable to save the size and location of a Form. When dealing with customizable user settings, it is important to determine where to persist the user’s applications settings. The Application class has a UserAppDataRegistry property that references the HKEY_CURRENT_USER\Software\[Control.CompanyName]\[Control.ProductName]\[Control.ProductVersion]. registry key in the user’s profile (If this key does not exist it is created). Here is a basic example of storing a form's state in the user's registry profile:

	private void Form_Load(object sender, EventArgs e)
        {
            this.WindowState = (FormWindowState)FormWindowState.Parse(WindowState.GetType(), Application.UserAppDataRegistry.GetValue("WindowState", FormWindowState.Normal).ToString());
            if (this.WindowState == FormWindowState.Normal)
            {
                int x = (int)Application.UserAppDataRegistry.GetValue("LocationX");
                int y = (int)Application.UserAppDataRegistry.GetValue("LocationY");
                this.DesktopLocation = new Point(x, y);
                int w = (int)Application.UserAppDataRegistry.GetValue("WindowSizeW");
                int h = (int)Application.UserAppDataRegistry.GetValue("WindowSizeH");
                this.Size = new Size(w, h);
            }
        }

        private void Form_FormClosing(object sender, FormClosingEventArgs e)
        {
            Application.UserAppDataRegistry.SetValue("WindowState", this.WindowState);
            Application.UserAppDataRegistry.SetValue("WindowSizeH", this.Size.Height);
            Application.UserAppDataRegistry.SetValue("WindowSizeW", this.Size.Width);
            Application.UserAppDataRegistry.SetValue("LocationX", this.DesktopLocation.X);
            Application.UserAppDataRegistry.SetValue("LocationY", this.DesktopLocation.Y);
        }