This Page has been modified since you opened it. You must open the page again. Refresh. When I postback to another site from button

Question

If I button post one sharePoint site page to a page on another I get

This Page has been modified since you opened it. You must open the page again.
Refresh

I have a webpart page with an asp.net button that is posting to page on another site on the same farm. That page is update a list item back on the original site. I'm doing it this way because I want to share the updating page with many other sites/solutions.

I'm passing no query strings. And the problem occurs on post to the second page. I have inline C# as follows.

I can't say for certain this code was ever working without the error to refresh. But Im pretty sure it was.

It asks for the refresh and then the update works.

protected override void OnLoad(EventArgs e)
{

try{
using (SPSite siteCollection = new SPSite("http://mysite/lists/mylist"))
{
    SPWeb web = siteCollection.OpenWeb();
    web.AllowUnsafeUpdates = true;
    SPList AC = web.GetList("http://mysite/lists/mylists");
    SPListItem oListItem = AC.GetItemById(1);
    oListItem["Status"] = "t2";
    oListItem.Update();
}
}
 catch (Exception ex)
 {
  Response.Write(ex.Message.ToString());
 }

On the from button calling side:

<asp:Button runat="server" Text="Job t3 Completed" id="complete" /></asp:Content>

with inline C# block

protected override void OnLoad(EventArgs e)
  {
     base.OnLoad(e);
        complete.PostBackUrl="https://........../t3.aspx";
    }

UPDATE: 9/10/202 1:155.. I just tested this with two basic aspx pages on both SharePoint sites. one with a button the other no code and still get the error. The postback URL having no querystring - It still gives me the error. I then button to aspx page on my desktop (non SharePoint) and do not get the error and request for refresh. Apparently, it's because I'm doing the postback from SharePoint? I've the javascript and directive changes suggested on on other sites with no luck.

Answer 1

Are you using any QueryString with ID parameter??

If yes, then change to it something else. Hope this helps :)

Answer 2

Fist of all you have to dispose SPWeb Object, also I recommend you to set back AllowUnsafeUpdates value:

Using(SPWeb web = siteCollection.OpenWeb())
{
    bool updates = web.AllowUnsafeUpdates;
    try
    {
         web.AllowUnsafeUpdates = true;
         SPList AC = web.GetList("http://mysite/lists/mylists");
         SPListItem oListItem = AC.GetItemById(1);
         oListItem["Status"] = "t2";
         oListItem.Update();
    }
    finally
    {
         web.AllowUnsafeUpdates = updates;
    }
}