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I made a  loop in VB.net to check every line and set a value in text when not empty


What I have tried:

count = 0
Do
    row= sr.ReadLine()

    If Trim(row).Length > 80 Then
        count = count + 1
        If count = 1 Then
            s_value1 = Trim(row.Substring(0, row.Length - 10))
            s_value2 = Trim(row.Substring(row.Length - 10, 10))
            s_text1.Text = s_value1
            s_text2.Text = s_value2
        End If
        If count = 2 Then
            s_value3 = row.Substring(0)
            s_text3.Text = s_value3
        End If
    End If
    Loop Until line Is Nothing
Posted
Updated 10-Jul-19 4:18am
Comments
Dominic Burford 10-Jul-19 10:00am    
Have you stepped through the code? Where does the error occur? Knowing how to debug code is a skill you will need.
Sinisa Hajnal 10-Jul-19 10:39am    
Step through the code and see which line throws the error. My guess is that row is null after readline.

This is one of the most common problems we get asked, and it's also the one we are least equipped to answer, but you are most equipped to answer yourself.

Let me just explain what the error means: You have tried to use a variable, property, or a method return value but it contains null - which means that there is no instance of a class in the variable.
It's a bit like a pocket: you have a pocket in your shirt, which you use to hold a pen. If you reach into the pocket and find there isn't a pen there, you can't sign your name on a piece of paper - and you will get very funny looks if you try! The empty pocket is giving you a null value (no pen here!) so you can't do anything that you would normally do once you retrieved your pen. Why is it empty? That's the question - it may be that you forgot to pick up your pen when you left the house this morning, or possibly you left the pen in the pocket of yesterdays shirt when you took it off last night.

We can't tell, because we weren't there, and even more importantly, we can't even see your shirt, much less what is in the pocket!

Back to computers, and you have done the same thing, somehow - and we can't see your code, much less run it and find out what contains null when it shouldn't.
But you can - and Visual Studio will help you here. Run your program in the debugger and when it fails, VS will show you the line it found the problem on. You can then start looking at the various parts of it to see what value is null and start looking back through your code to find out why. So put a breakpoint at the beginning of the method containing the error line, and run your program from the start again. This time, VS will stop before the error, and let you examine what is going on by stepping through the code looking at your values.

But we can't do that - we don't have your code, we don't know how to use it if we did have it, we don't have your data. So try it - and see how much information you can find out!
 
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Maybe try to change you loop to a while loop:
VB
While (Not String.IsNullOrEmpty(row = sr.ReadLine()))
   '' ...
End While

A Do..Until loop only performs the test when the Until statement is reached; at this point, loop contents have already been executed, and there is a big chance to get a NullReferenceException if the assignation at the beginning of the loop lead to a null value.
Whereas a While loop performs this test at the very beginning.
 
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