Contatenating two string

i want to merge two strings

example:

first string : www.org.a.org

second string: .org.lb

result string : www.org.a.org.lb

example:

first string : www.google.com

second string: google.com

result string : www.google.com

dim s1 as String = "www.org.a.org"
dim s2 as String = ".org.lb"
dim s2 as String = s1 & s2 ' www.org.a.org.org.lb !!