Null argument???

[EEguruWSU]

when I run this code:

 

       Dim sr As StreamReader = New StreamReader(mainprogram)
       Dim line As String
       Do
           line = sr.ReadLine()
           If Regex.IsMatch(line, "\s*CALL") Then
           End If
       Loop Until line Is Nothing

 

I get the following error:

 

An unhandled exception of type 'System.ArgumentNullException' occurred in system.dll

 

the error comes from line

If reges.isMatch(line,"\s*CALL")then

 

Additional information: Value cannot be null.

 

 

if you have any suggestion please let me know

Edited February 21, 2007 by PlausiblyDamp

[Robby]

instead of 'Loop Until line Is Nothing"

 

Change to "DO" part to something like "Do While sr.ReadLine"