vb.net phone number validation

Hi! This is my another tutorial in VB.NET entitled "Validating a Phone Number". We will just validate a phone number by using the System.Text.RegularExpressions namespace. So, now let's start this tutorial! 1. Let's start with creating a Windows Form Application for this tutorial by following the following steps in Microsoft Visual Studio: Go to File, click New Project, and choose Windows Application. 2. Next, add one TextBox named TextBox1 which will be used to input the phone number.