viewstate

问题 I have a dropdown list inside an editItemTemplate. The Dropdownlist onSelectedIndexChanged event fires on change like I want. However it also will fire when I submit the form. ********UPDATE ************ Per Saechel comment below, I started to investigate further. Here it describes it can be done. http://blog.programmingsolution.net/net-windows-application/selectionchangecommitted-and-selectedindexchanged-events-system-nullreferenceexception-while-closing-windows-form/ BUT, I tried it and it

问题 Why when a control does contain value but it's set to .Enable=False that all controls become disable (that's ok) but why that the ViewState doesn't retain the data on the next post back? If I get the UserControl without modifing its Enable state, the ViewState work between post back. How can we disable a UserControl that all its control become disable (this part work) but all of them KEEP use the ViewState (this doesn't work)? Clarification: 1)In the aspx.cs click button EDIT: myControl

问题 Now there are 2 buttons, let's call them "Button1" and "Button2" respectively. If I click "Button1", store "1" in ViewState["Record"]; also, if I click "Button2", store "2" in ViewState["Record"], etc. When I click Button1⟶Button1⟶Button2⟶Button2, my expected result is: in ViewState["Record"], there are a list of records, like [1,1,2,2]. Here is my click event code: protected void Button1_Click(object sender, EventArgs e) { ViewState.Add("Record", "1"); } protected void Button2_Click(object

问题 We have a web app(-ish) webform, and we use many custom UserControl s. We load a bunch of them in each view, but we don't want them to render, or even pre-render, until we don't have to use them. Then we set Visible = False in each control and then we use Update Panel s to set it to True whenever the control is needed. The control then shows up correctly. But in the next postback we have a very nasty MAC validation error, and we think it is related to the ASP not updating the viewstate (but I

问题 I'm, using jQuery and ASP.NET to show a dialog containing buttons. After some scouring, I got the buttons in the dialog to work by adding a tad more JavaScript to append the dialog to the form. var dlg = $('#ctl00_ctl00_PageContent_PageContent__pnlPopup').dialog({ autoOpen: false, height: 180, width: 500, modal: true, draggable: true }); dlg.parent().appendTo($('form:first')); // without this, controls in the dialog are non-functional This works fine until I open the dialog, close it, then

问题 if i set EnableViewState="false" then also input data is maintain after postback at the time of using control like textbox radio button checkbox etc. So I just wanted to know bit internal things that if EnableViewState="false" then how input data is maintain after postback when we are using control like textbox, radio button checkbox etc. please discuss the internal issue. Thanks. here is my aspx code <%@ Page Language="C#" AutoEventWireup="true" EnableViewState="false" CodeBehind="WebForm2

问题 I am running into confusing behavior related to async code registered on an ASP.NET page with RegisterAsyncTask, ViewState, and checkboxes, and I need to know exactly when these async-tasks run relative to when ViewState is saved. I have a few checkboxes inside an ASP:PlaceHolder control. I am reading a record and populating the checkboxes, then I make the PlaceHolder visible. If all this is synchronous - maybe within Page_Load - all is well. If this is registered as an async task the

问题 I have an ASP.net 3.5 sp1 web application that is running on IIS6 and has the machine and validation keys set in the web config. The application functions correctly on all browsers except safari. The page loads correctly but when a postback is performed I receive a "Validation of Viewstate MAC failed" error. (Also, the app pool only recycles once a day during the night but this shouldn't make a difference as the keys are fixed.) I have found several suggestions on the internet including

问题 I have a site that uses a couple DropDownLists that are databound. I was also doing the traditional if (!IsPostBack) {list.Databind();} and relied on viewstate to keep the lists filled during a post back. I recently converted the site to ASP.NET 3.5 and noticed that the lists are empty during postback (as if ViewState is disabled). I didn't explicitly disable anything, and am wondering if anyone has seen a similar change or behavior in their viewstate dependent controls. Thanks! James 回答1: I

问题 I have HealthMonitoring on for my website. 90% of my pages are accessed in the format http://www.itsmywebsite.com/showproduct.aspx?id=somenumber I was checking the WebEvents_events tables and saw that my table is full of primarily two errors ERROR 1 0002609ad8vdf45f8daffc7de8716e32 2013-11-25 17:01:18.153 2013-11-25 11:01:18.153 System.Web.Management.WebViewStateFailureAuditEvent 9877 1455 4009 50204 Viewstate verification failed. Reason: Viewstate was invalid. C:\HostingSpaces\parthak