Saving text box text to a file

AlexW · May 19th, 2011, 03:44 PM

I'm really stuck on something that I'm sure is a quick fix, I'm trying to save text from a text box into a text file stored in App_Data. When I hit a button with code to save it to the file, it appears that the text property of the text box remains whatever it was previously before a user has edited it.

Could this be view state persisting what was present on the page load? How can I get it to see the newly entered text to save?

Any thoughts appreciated.

Imar · May 19th, 2011, 03:58 PM

Hi Alex,

Probably not view state, but a PostBack issue. Maybe you're assigning the text box a value without checking for Page.IsPostBack

If that doesn't help, can you post the relavant parts of your code?

Cheers,

Imar

AlexW · May 19th, 2011, 04:39 PM

Hi Imar,

That didnt seem to change anything, on the page load I fill the text box from the text in the file:

txtMemberNews.Text = File.ReadAllText(NewsFile)

Then on save button I save the text to the file:

Dim rdr As StreamWriter
rdr = New StreamWriter(NewsFile)
rdr.Write(txtMemberNews.Text)
rdr.Close()

Problem is I've found that txtMembers.Text contains the text as it was loaded, not the text after a user has changed it so it just saves the original text back to the file??

Imar · May 19th, 2011, 04:54 PM

Quote:

on the page load I fill the text box from the text in the file:

But if you don't add a check for Page.IsPostback, the Text property is updated again after the user clicked the button, and before the button's Click event fires. This resets the user data, causing the behavior you're describing.

BTW, rather than using StreamWriters and so on, you can also use System.IO.File.WriteAllText(....)

Cheers,

Imar

AlexW · May 20th, 2011, 11:30 AM

Great thanks, I added If Not Page.IsPostBack when loading the text onto the page and now is behaving. I spent ages thinking the issue was it not being saved to the file, doh!