How to use Join Method in VB.NET
Join method combined two or more strings or objects (elements of array) together .
You can combined two or more strings or objects together. It is also combine elements of array. Join Method take first separator that divide strings. I have used two different separator. In first line, I used ":" to represent separation between two strings and in last line "vblf" for new line. You can use any separator to represent combination of lines.

Next, join method take name of strings that you want to combine to other string.
In the below join method str1 and str2 is joined using "," separator.
Dim joinStr = String.Join(":", str1, str2)
And the below statement join only one string with separator.
Dim str3 As String = String.Join(vbLf, arr2)
Code
Module Module1
Sub Main()
Dim str1 = "My name is"
Dim str2 = "Sachin Tendulkar"
Dim joinStr = String.Join(":", str1, str2)
Console.WriteLine(joinStr)
Dim arr2 As String() = New String()
{
"Mark", "Clark", "Hussey", "Lara"
}
Dim str3 As String = String.Join(vbLf, arr2)
Console.WriteLine(str3)
Console.ReadLine()
End Sub
End Module
Output
