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VB.Net - Windows UserName index and length error

I have a Vb.Net application that I want to track the user who logs into Windows.  I am keeping this information in a table that has only 8 characters long.  When I do the following, I am getting the error.

Index and Length must refer to a location within the string.  Parameter name: length 

Dim strUser String = System.Environment.Username.Substring(0,8).ToUpper

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I did a length and the name "blakie" is 13 characters long.  So is there something that is padding in that string?  I also tried to trim, but it's still come up as 13 characters long.
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Pawan Kumar
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holemania

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Yeah, not sure why it is giving me that error.  When I did the following I am getting length of 13 which is a bit odd.

Dim strUser As String = System.Environment.UserName.Substring(0, 8).ToUpper

Msgbox(strUser.Length)

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David Johnson, CD
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Looks like when I add the "If" statement to evaluate the length, the error went away.  Thanks.