Use the overloaded operator : String Concatenate « Data Type « VB.Net Tutorial

Option Strict On
 Imports System
 Class Tester
     Public Shared Sub Main( )
         Dim s1 As String = "abcd"
         Dim s2 As String = "ABCD"

         Dim s4 As String = s1 & s2
         Console.WriteLine("s4 concatenated from s1 & s2:"+ s4)

     End Sub 'Main
 End Class 'Tester
s4 concatenated from s1 & s2: abcdABCD

2.27.String Concatenate
2.27.1.String Concatenate
2.27.2.Use the overloaded operator
2.27.3.Create Random String from String array
2.27.4.Concat method with a String array.