I would like to save some data for use after a page postback. Here is an example of what I'd like to do:
Partial Class TestPage Inherits System.Web.UI.Page Private _CategoryID As String = "" Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If Not IsPostBack Then _CategoryID = "ABC" Me.ViewState("CategoryID") = _CategoryID Else _CategoryID = CType(Me.ViewState("CategoryID"), String) End If End Sub End Class
I've tried both session variables and view state. The page loads fine initially, but on postback I get the following error:
Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
What am I doing wrong? How can I save this data for use after postback?
I am having a problem with postbacks on my live server.I have added a button to my page with postbackurl="google.com when I press the button it is doing nothing but If I put response.redirect("google.. in the code behind button click event it will work?Is there an simply reason that the postbackurl is not doing anything?
I have a page, where I dynamically add textboxes within an updatepanel with a button.click event. Those are common telephone, fax, email, etc.. Now I put in some values, store those in Session with Arraylist and go to next page. Here, there is a button to go back to previous page. Ive managed to recreate all those textboxes on Page_Load event, using if not page.ispostback, then.. Now, this problem is driving me crazy. When I load my page, put in some values, add as many textboxes, as I want and go "Next", its ok. Then I go "Back" and everything is recreated and I see as many values within textboxes, that I created. But when I do this for a 2nd time, I can only see recreated textboxes without values. Ive spent some time searching for a simple solution, or an advice. But with no success. I could post some code here, but its a bit long and complicated. But if necesarry, I will.
i am currently working on a webform that has several dynamically populated dropdown lists. this works just fine, however, i have other web controls that require to have a postback..and at the time the page postsback, it reloads my dropdownlists, reseting whatever option i had chosen...
I am generating an html flow into Update Panels in a content ASPX page (VB.Net 2008 Professional w/ SP1). These include EDIT anchor tags that call a javascript function which calls __doPostBack(target, args); so I can interact with the code behind. This all works fine except on some of the postbacks the connection with the browser just seems to get closed prematurely and suddenly the webpage displays a directory listing. When debugging it, it only happens sometimes, at different places for the E and D options below but not for the V or AddPost or AddArticle. I am just stepping through E or D and suddenly the web page show a directory listing. (What is that? Is the connection crashing? Is the page suddenly redirecting to the base directory because it crashed?)
At present i am able to persist that using session InProc mode. except that i cant use either stateserver or sql server as the HTTPPostedFile is not serilizable. i can't use viewstate either for the same reason. Is there any work around to persist that httppostedfile across postbacks for session modes other than inProc or viewstate?
I have a website that serves all its pages using a single 404 page. it displays hotel profiles form business and depending on different profile levels offers more or less functionality and information.
Through the DB a masterpage is selected and usercontrols are applyed to that.
I have a contact page like this : 404.aspx > masterpage.Master > contact.ascx
My form action looks like this default.aspx?404%3bhttp%3a%2f%2fwww1.testsite.co.uk%3a80%2fcontactus
and when I click the button this where I send up with an error "Validation of viewstate MAC failed" error.
I have read stuff on these for 4 hours but still have no idea where to start.
Do I need to
Catch the form action URL (postback URL) in the baseclass and change it back to [URL] - If I do this are the form firled values still intact
Do i need to do something to change the form.action url before the page is built, if so is this done in the masterpage preinit event as this is what the form tag is
What I know works is that the usercontrol is aware of the postback, but not the form values.
I want to be able to add a 404 based contact us form on any one of 1000s of profiles and be able to catch the values. Idearly I would like to do this in the codebehind of the usercontrol as this keeps the code seperate
I am sure this must be possible and normally I can work stuff out, but here I am totally stuck. I am trying to do this in VB.
I have a situation where I send data to different domain and return back to my domain. At this point I'm losing my form data. I know that we can use sessions, cookies or query strings. But i have large data in the form. So I can't use those. Can anyone best way to save form data between postbacks and redirect.
This is code which I'm using to redirect to different domain and come back to my domain:
I am using System.Web.Routing with ASP.NET (3.5) Web Forms that will URL rewrite the following URL from
http://www.myurl.com/campaign/abc
http://www.myurl.com/default.aspx?campaign=abc
The code is as below:
public static void RegisterRoutes(RouteCollection routes) { routes.Add("CampaignRoute", new Route ( "{campaign_code}", new CustomRouteHandler("~/default.aspx") )); } IRouteHandler implementation: public class CustomRouteHandler : IRouteHandler { public CustomRouteHandler(string virtualPath) { VirtualPath = virtualPath; } public string VirtualPath { get; private set; } public IHttpHandler GetHttpHandler(RequestContext requestContext) { if (requestContext.RouteData.Values.ContainsKey("campaign_code")) { var code = requestContext.RouteData.Values["campaign_code"].ToString(); HttpContext.Current.RewritePath( string.Concat( VirtualPath, "?campaign=" + code)); } var page = BuildManager.CreateInstanceFromVirtualPath (VirtualPath, typeof(Page)) as IHttpHandler; return page; }
However I noticed there are too many things to change on my existing aspx pages (i.e. links to javascript, links to css files).
So I am thinking if there's a way to keep above code but in the end rather than a rewrite just do a Request.Redirect or Server.Transfer to minimize the changes needed. So the purpose of using System.Web.Routing becomes solely for URL friendly on the first entry.How to ignore the rest of the patterns other than specificed in the code?
I'm having a bit of trouble with some strings I am using after rewriting my Url.
My url is here: [URL]
In the above example, Warwickshire is the county and Warwick is the town. I'm referring to these in my query string and am assigning the relevant town/ county to strings in my code behind in order for me to populate labels in page text.
The problem I'm having is that the labels in my page aren't being updated like 'Warwickshire' or 'Warwick, but as 'Warwickshire-Magician' or 'Magician-Warwick'. You can see in the above example that this is making my text not make sense at all. I want to get rid of the 'Magician-' text so I am just left with the town/ county name.
I've got a sitemap in db with all current url, but some urls has changed so I added a column for old urls so I can redirect if old urls are requested and redirect to the new url.
I am using UrlRewriter to rewrite url, below code snippets working fine for single page. As you can see page 'ViewPost.aspx' is being used to rewrite url i want to add one more page 'ViewPost2.aspx' how to achieve it.
webconfig file <rewriter> <rewrite url="(.+)-(.+).aspx" to="~/ViewPost.aspx?id=$2"/> </rewriter> constructing url here
I have a C# web application that dynamically adds user controls to the default page for whatever "mode" the application is in. The problem is that it is not persisting these across postbacks. How do I persist these across postbacks and keep the content of the controls that are in the user control?
For instance, say I have a user control that creates a new tour record. The user clicks on the Tour item from the menu on the default page, it dynamically loads the tours user control. The user then fills out the form in the tours user control and clicks save. This is where the problem happens. When the postback occurs, the web application has no idea that the new tours user control was ever loaded. So, no save takes place because the Save button's click event never even gets fired.
I have a requirement where i need to add file upload contorls dynamically.Intially i have a upload control in my page and button named 'Add fileupload' and another button named 'Upload'.the fileupload control is added dynamically when 'Add fileupload' button is clicked andUpload button is used to upload the files.when i click on 'Add fileupload' button after browsing the file to fileupload control, the new fileuplaod contorl has been adding successfully but the first fileupload control is empty.Can any one please help me how the state of fileuplaod control is maintained.Here is the code
