Use String.Concat to concatenate two strings : String Functions « Data Type « VB.Net Tutorial

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public class Test
   public Shared Sub Main
        Dim aryStrings() As String = {"string1", "string2", "string3", "string4"}
        Dim strLongString As String

        strLongString = String.Concat(aryStrings)
        Console.WriteLine(strLongString)

   End Sub
   
End class

string1string2string3string4