Got problem when edit textfile's content in Textarea and save it again in textfile

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I have a TextArea displaying textfile's content for editing. A button to save content again in textfile.

XML

<asp:Button ID="btnSave" runat="server" Text="Save" onclick="btnSave_Click" />

    <textarea id="code" name="code" runat="server"  wrap="off" rows="30" cols="100" >
                                      </textarea>

And in code behind:

C#

private string path;
       protected void Page_Load(object sender, EventArgs e)
       {
           code.Attributes.Add("Style", "display:block");

           path = Request.QueryString["path"];// path= "D:\\C#Projects\\website\\Lecturer\\giangvien\\ProxyClass.txt"
           string content = File.ReadAllText(path);
               code.Value = content;
       }

       protected void btnSave_Click(object sender, EventArgs e)
       {
           string newcontent = code.Value;
           File.WriteAllText(path,newcontent);
       }

All I want is: I edit the ProxyClass.txt content displayed in the TextArea `code` then click on button Save so `ProxyClass.txt` is saved again with new content.

But after I edit the `content` and then click `Save`, the `saved-content` is still the `old content` (no change).

Try to debug, the newcontent is the first content of the textfile.

Why cannot I save the new content???

I just think that using `string newcontent= code.Value;` can get the current text in the TextArea.

Is there any mistake in my code above. I need your opinion.

Help!!!

Posted 24-Oct-13 5:52am

Vy Clarks

Updated 24-Oct-13 6:02am

phil.o

v3

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sjelen · Accepted Answer · 2013-10-24T06:46:00

You are reading file on each postback and assigning it's content to textarea - overwriting changed content posted from browser.
Try:

C#

protected void Page_Load(object sender, EventArgs e)
{
    code.Attributes.Add("Style", "display:block");

    path = Request.QueryString["path"];// path= "D:\\C#Projects\\website\\Lecturer\\giangvien\\ProxyClass.txt"
    if (!IsPostBack) {
        string content = File.ReadAllText(path);
        code.Value = content;
    }
}