isNumeric function decides whether a variable is number or not. Example :
Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim age As Integer age = 20 Dim name As String name = "peter" If IsNumeric(age) Then ' checking for integer Console.WriteLine("Integer found") End If If IsNumeric(name) Then Console.WriteLine("Again integer found") End If End Sub End Class