Vb.Net

I have a column "Comments" Type - ntext which is entered in a richtextbox
I need to find the Carriage  Return , TAB or Line feed positions  in the string

I have tried the examples in code
How do I detect Carriage  Return , TAB or Line feed or any other character other than a Number or Letter

for I as integer = 0 to comment.length - 1
      If Comment.substring( i, 1) = Chr(13)  then        'it says chr is not defined
      end if
next 

Dim index As Integer = InStr(comment, vbCrLf)     'it says vbCrLf & instr not defined

for I as integer = 0 to Comment.length - 1
      If comment.substring( i, 1) = vbCrLf  then        'it says vbCrLf is not defined
      end if
next 

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KevinfeeningAsked:
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MlandaTCommented:
Add Imports Microsoft.VisualBasic to the top of the file (or to your default project references).
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KevinfeeningAuthor Commented:
Should have known that
Thanks
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Visual Basic.NET

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