I am looking for a TextBox control, which can validate and filter out IP Address. After a bit research, I come with this https://social.msdn.microsoft.com/Forums/vstudio/en-US/4c2aefae-ca6a-4e71-8564-fe73da7107f1/maskedtextbox-formatting-for-an-ip-address?forum=csharpgeneral. It’s easy to implement and simple to use. Just like normal TextBox. using System.Windows.Forms; class IPTextBox : TextBox { public IPTextBox() : base() { SetStyle(ControlStyles.ResizeRedraw, true); } protected override CreateParams CreateParams … Continue reading C# UserControl IPTextBox