Variable within loop

Question

I have a label control in an updatepanel called lblStatus. I have the follwing code in my codebehind:

for x = 0 to 100
lblstatus.text = x
Threading.Thread.Sleep(1000)
updatepanel.update
next

I cannot seem to get the status to show. It only shows the last number once the loop is complete. Please help.

Guffa · Accepted Answer · 2013-09-02 18:28:17Z

2

You can't update an update panel in a loop. The updates for the page isn't sent to the browser until the response is complete on the server, so you can only do one update for each request to the server. Your code will simply change what the update will be several times, and the final update is then sent to the browser when the server code ends.

answered Sep 2, 2013 at 18:28

Guffa

703k111 gold badges760 silver badges1k bronze badges

Sign up to request clarification or add additional context in comments.

6 Comments

Scott Over a year ago

So how would i go about properly pushing the update to the status label? I see other web apps doing so.

Guffa Over a year ago

@Scott: You need to make a request to the server for each update. You can set up a timer that will trigger the requests. You should however consider using AJAX calls to fetch the data from the server instead of doing webform callbacks for each update.

Scott Over a year ago

not sure i understand how to do that. the code was purely an example, what i have is a range of ip addresses i need to ping and show a boolean status of whether the ping was successful.

Guffa Over a year ago

@Scott: You can either send one request to the server for each IP address to test, or you can send a single request to the server and let the server test all IP addresses at once and return the result for all of them.

Scott Over a year ago

very close to an answer here. if i had 4 ip addresses to ping and my app pinged the first one, how would it know when the first command had completed and to send the second ping command?

|

Collectives™ on Stack Overflow

Variable within loop

1 Answer 1

6 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

6 Comments

Your Answer

Sign up or log in

Post as a guest

Related