C#:
string s3 = "Visual C# Express";
System.Console.WriteLine(s3.Substring(7, 2)); // outputs "C#"
System.Console.WriteLine(s3.Replace("C#", "Basic")); // outputs "Visual Basic Express"
Substring從0開始算
VB:
Dim TestString As String = "Mid Function Demo"
Dim FirstWord As String = Mid(TestString, 1, 3)' Returns "Mid".
Mid從1開始算 
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