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How to tell if a text file has tabs in it ?

How can I tell i a text file has tabs in it? I have  vb.net code, but it is not recognizing the tabs, so I am wondering if there are actually tabs in the text file.
Visual Basic.NET
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Dr. Klahn
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Dr. Klahn
The legacy method would be to read the text file line by line, parsing each line to see if there is a 0x11 / HT / horizontal tab character in any byte.

Regrettably that method works 100% only in ASCII / UTF-8 source files.  For files encoded in other character sets the situation is more complicated.
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Thanks. Is there any editing tool which might physically show the actual tab? I Think the old Word Perfect use to allow for that type of feature. It would be real nice if I could somehow examine the file, and observe the embedded control characters.
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Visual Basic.NET
Visual Basic.NET

Visual Basic .NET (VB.NET) is an object-oriented programming language implemented on the .NET framework, but also supported on other platforms such as Mono and Silverlight. Microsoft launched VB.NET as the successor to the Visual Basic language. Though it is similar in syntax to Visual Basic pre-2002, it is not the same technology,

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