change label.text when data changes

[jkatshor]

I have a form with label1.text that always runs.

label1.text = "operator1"

i have read in a text file and saved data from it as a string.

i want to continually read this file and when the string data changes i want label1.text = "operator2"

i cannot figure out how to change the label1.text when the data changes.
any tips?

thanks in advance

 

[jmcilhinney]

If newFileContents <> oldFileContents Then
    label1.Text = "operator2"
End If

Obviously you need to read the data from the file into those variables in the first place.

 

[ak08]

hi friend
keep one more variable as old data variable
and compare it with the present one and change the text

 

[jkatshor]

I understand the suggestions you posted and have already tried something similar. To try to explain my question a little more, this app always runs without buttons, I want to continually read a file and capture a portion of it as a string. If the file does not change the string remains the same. When the file changes I want to change a label1.text to read a preassigned value. My problem is I do not know how to continually read this file. any suggestions??

Thanks

 

[jmcilhinney]

You can't "continually" read a file. I presume you mean intermittently, perhaps at regular intervals. If so then you would just use a Timer and read the file on its Tick or Elapsed event, depending on which type of Timer you use.

Another alternative might be to use a FileSystemWatcher. In that case you'd be notified when the file changes so you would only read it if and when there were changes to read.