have gone through many post but unable to identify how IsPostback peroperty of page works.HTTP is a stateless protocol so how server identify that a client is making request 2nd time not 1st time and set the value for IsPostBack Peoprty.
View 2 RepliesI was wondering if setting a default value for a SelectList is considered to be presentation logic or business logic? For example, if a requirement is that an Employee cannot be saved without a Location, but 99% of the time the location that would be selected is a particular item -- say Atlanta. Because of this, the location SelectList should be defaulted to Atlanta when ever a entry screen for a new employee is displayed. Should I be defaulting the location in the model or in the view-model? One thing I realized is that the unit tests become awkward because in both cases, I'd be forced to test against a location that will always be present in production but I cannot create a unit test with my own test dataunless "Atlanta" was in the set of locations being used in the test.
View 4 Repliesthe simple difference between Ispostback and Iscallback..
View 1 RepliesI have a page that uses a user control, I have to detect the pages !IsPostBack in the User Control and do some operation
In the User controls page Load method I tried using the following variations to detect the first load
!Page.IsPostBack
!Page.IsCallback
!this.IsPostBack
!this.IsCallback
!this.Parent.Page.IsPostBack
!this.Parent.Page.IsCallback
None of these worked, they all fail to detect the parent pages 1st load in the usercontrols page load method
I also tried using
if (Request.UrlReferrer.AbsolutePath.ToString() != "/PreviosPage.aspx")
This worked for Fire Fox and Chrome but not IE (IE has issues with Request.UrlReferrer, it throws a null exception)
So I cant use this approach as well.
I dynamically add the webcontrol in onInit or onload (page_load). it will cause the second post back and with the ispostback==false;
if first enter the page is no problem. but if I click on the some button. it will trigger postback two times.
first time: ispostback = true.
second time: ispostback = false.
the second time postback caused me headache because all my value has been initialized due to the coding like below:
DataTable _temp;
if(! ispostback)
[Code]....
I have a strange problem, my webform is loading twice.
when i debug i see ispostback is showing false for both times.
what happened to the first time load , and the viewstate.
What can remove all info from viewstate and making the ispostback again to false.
i am having real difficulty figuring out what is causing this problem.
What is the best sequence order for Page.IsPostBack and User.Identity.IsAuthenticated? From what I have search for, this comes up most common:
If Not Page.IsPostBack Then
If User.Identity.IsAuthenticated Then
~Some kind of code~
End If
End If
Is this considered "best practice" or can the two items - Page.IsPostBack and User.Identity.IsAuthenticated -be split into their own sections so the fuctions of these can be independent of each other?I am trying to troubleshoot a placeholder that disappears from a master page when a content page button is pressed to change the content pages active view (I have a multiview w/ 5 views inside of it).
I am working on rewriting URLs Urlrewriting.net, and have run into what seems to be a common problem but I can seem to fix it. I'll present a simplified case.
The URL rewriting is working perfectly with the rule:
<urlrewritingnet rewriteOnlyVirtualUrls="true" defaultPage="default.aspx" defaultProvider="RegEx" xmlns="http://www.urlrewriting.net/schemas/config/2006/07">
<rewrites>
<add name="catalog" virtualUrl="^~/catalog/(.*)/(.*).aspx" rewriteUrlParameter="ExcludeFromClientQueryString" destinationUrl="~/catalog.aspx?cid=$1&c=$2" ignoreCase="true"/>
</rewrites>
</urlrewritingnet>
On the page I have a DataList with 2 asp:buttons inside. When clicked, the page refreshes but does nothing.
I followed ScottGu's article to impliment a form control adapter to rewrite the action of the form to match the rewritten URL.
Page URL in the browser:
[URL]
<form name="aspnetForm" method="post" action="/dev/catalog/13/Music.aspx" id="aspnetForm">
I now see the correct URL on the form action, and when debugging I can see the page load event firing.
The problem now is that every time the page loads Page.IsPostback is false, causing the page to rebind the DataList and therefore ignore the ItemCommand the buttons should be triggering.
if (!Page.IsPostBack)
PopulateControls();
I'm using .NET 3.5 SP1, there is a ScriptManager on the master page but no UpdatePanel on this page. I've also tried resetting the Form.Action property and bypassing ScottGu's solution with the same result. If I go to the page URL directly without using the rewriter everything works fine.
I am using ASP.NET. I have to set the value of a variable [testVar] into javascript on page load. only for the first time when the page load. Just like !IsPostBack event on code side. From next postback this function of javascript should not call.
View 1 Replies I'm trying to cache a complex page with lots of controls on it so that if the user navigates to it later it will look like it did when he last saw it.The page has controls which post back and other controls are populated depending on the selections.
I'm using [Code]....
after the <@ Page directive.
What happens is that a postback gets the cached page, so no processing and it looks the same regardless of user selections. So far so good. But if I browse to another page and return by a link, the cached version is ignored and the default page is created again. This is more or less the opposite to what i want.
I attempted to use the validation callback to ensure that a postback resulted in a new version, and that worked, but it still ignored the cached page if it wasn't a postback.I realise that it will need more work to ensure each user gets their version of the page from the cache, but why bother if this doesn't work.
I am looking into someone's code for a production application which is working fine.There is one page (main.aspx) and this main.aspx has 5 user controls inside it.Inside the Page_Load event of the main.aspx and all other user controls the first line of code is:
protected void Page_Load(object sender, EventArgs e){
if(IsPostBack) return;
I am finding this line very strange. As all the button events are postbacks. Then how come this application is working fine?
I'm developing a custom URL Rewriter for a ASP.Net 3.5 project. This rewriter is not functionally different than most rewriters out there, the only difference being that the friendly URL collection is not loaded from a web.config file -- it's coming from a database instead. I made the naive assumption that it would be easy to develop a custom rewriter module from scratch, but now I know the mess I put myself in. I digress; let's go straight to the technical issues.
While testing the rewriter, I set up a friendly url that would take the user to a web form. Postbacks from this form should not alter the friendly address, as anyone would expect, sohttp://my.web.site/app_root/FriendlyURL is always rewritten asttp://my.web.site/app_root/not_friendly/form.aspxThings are fine when the browser first loads the FriendlyURL. The page comes up and is completely functional. However, when the form is posted back to the server, the page simply reloads but, at server-side, IsPostBack is false. It's like F5 was hit, except that a HTTP POST had indeed occurred.Unsurprisingly, when the interaction occurs through the "unfriendly" URL, the POST action triggers the postback as expected. This evidence suggests that HttpContext.RewritePath is somehow messing with the page lifecycle in a way that it loses sense of the postback operation.
I have an asp.net page that sets a few session variables. On my development machine (localhost), I do a postback and the session values are still populated.
When I Reload the page by clicking on the url bar and pressing enter the session variables are still there.
However when i deploy this page to a webserver, the page still retains the session values when doing a postback, but as soon as i click the url and press enter the session values are lost (where the ispostback = false)
But when i press the refresh button the session variables are present (but i do get a popup warning me that the page data needs to be resent!)
i am running IE 7, and the webserver is iis6 what am i doing wrong?!
I have this form to update a users details. This really should work but doesn't seem to want to update the email, isApproved etc. The onload data is within "If not ispostback". I can't see why this won't work. It is attached to an update button btw.
[Code]....
When any of my page is idle for about 20 minute, and after that if I hit any button, like Sumit Button or any other button, at this time, Page.IsPostback is again False, and none of the click event is fired and page gets reloaded again.
This happens only if I go like this, open up any of my webpage, keep it idle OR do nothing for about 20 minute, exactly on 21st or 22nd minute, Click on any of the button on the page, and the page gets reloaded, click event does not get fired. I debugged for this and I checked the Page.IsPostback value at this point and I got it as False after 20 minute, I don't know why. It should be True. And because of this my page gets reloaded and nothing gets submitted and every control is in the blank position once again and user have to enter everything again.
But if I enter everything and hit any of the button or Submit button within 20 minute, then everything works fine, Submit button's click event is also gets fired and everything works perfect.
And this is happening in all of my page. I am not sure what configuration is wrong.
But just for more details, I have a master page, I am using Telerik Controls and I have session Timeout set as 60 minute everywhere, in web.config and in IIS settings and in my App_Pool also. On my Master Page, I have ASP:ScriptManager, Tekerik:RadMenu, ASP:ContentPlaceHolder controls and some other controls and javascript code too.
[code]....
I want to don't let the page to go back ,for that i am using the code to expire the page after the first time it loads so that when second time the page will load it will not find the such page in cache ,but problem is that my code is not working propely when i am using page.Ispostback, iam inserting my code here[Code]....
View 1 RepliesI have a RadioButtonList control, containing two ListItems. These two Radio Buttons toggle each other, so that only one is selected at a time. When the second is selected, it affects whether a Textbox is enabled or not, and also erases the text in the Textbox when selected. Lastly, a Button is present to execute the selections made.
I have a RequiredFieldValidator and a RegularExpressionValidator on the Textbox, since when the first Radio Button is selected, I need to validate the entry. However, I need to turn off the functionality of the Validator controls when the second Radio Button is selected.
In bus reservation mutiple end-user are requested for single seat at a time. How we can handle the multiple user request. how we can reserved the seat for one requester and how to handle the other requests for that seat.
View 1 RepliesI have a bounded dropdownlist. there may be many items in dropdownlist, i dont know how manty they will be depending on some conditions.suppose there are N items are bounded in this dropdownlist let say
A
B
C
D
E
.
.
.
.
.
N
and I am also doing that if i select A and click add button then it'll be added in a gridview, then i selectB and click add button the B will be added to the gridview.. and so on.I want make it restricted like if i again select A and click add button then it should not be added to the grid view and show msgs thatA is already in the gridview. and if I delete A from gridview that and select A again and click add button the A should be add to the gridview.just let me know the logic with explanation.
I have a very simple datalist setup to a SQLDatasource. Displaying the data works great. But I want to replace the plain databinder container with a hyperlink instead and have that link setup to point to a detail page with a parameter. Here is my datalist setup:
[Code]....
On another page im using gridviews adn able to do what i need by using the RowDataBound of the gridview like so, how can I accomplish the same thing with a datalist?
[Code]....
I tried using the ItemDataBound and trying to modify the logic above to fit the datalist, but cant figure out how to, so I have it commented out at the moment.
[Code]....
I have the below code that works for an asp.net repeater but I need to convert the logic so it works for an asp.net listview control...possible? Unfortunately, the same code throws errors when placed within my listview's itemdatabound event.
[Code]....
I know there are a few posts on this issue already, however I haven't found the answers I was really looking for.
My situation is like this: I have a DLL project containing my business logic. Then I have a web application that refers to this DLL, and calls a function from it. And I have a global.asax which handles errors on Application_Error
Sample:
// MyWebsite.aspx.cs
using MyBusinessLogic;
protected void Page_Load(object sender, EventArgs e)
{
MyBusinessLogicClass.DoSomething();
}
// global.asax.cs
protected void Application_Error(object sender, EventArgs e)
[Code].....
I have a sidebar on a page with vertical navigation about products The navigation links are created from an xml sitemap with a repeater control using 2-level nodes with product main categories and subcategories I want to display the data so when i click on a main category the page will reload showing the underlying subcategories names and description in the main section (div) of the page, but also when i click a subcategory's name from the sidebar, i will get its products (names and description from an SqlDataSource) in the main section. (In the main section i'm probably going to use a DataList)
Can i do that ? Display different category level data depending on the link that was clicked or do i need a seperate "maincategories" page. The scenario is similar to the master-pages-and-site-navigation tutorial in the data-access tutorials but that one goes as far as presenting the main categories [URL]
I m working in vs 2005 project(Built before 2 years with deklarit and Infragistics) and not using Ajax Update panel instead I m using Ajaxprodll throughout the project and I cannot use the update panel as it requires the huge changes in web.config file and I dont want to play with config file so I keep using Ajax pro dll.On my page there is a tab control in which there are 4 tabs.Each tab contain gridview and each gridview has same number of column.Firsttab is Daily has daily girdiew,Second Tab is Weekly and has a weekly gridview,Third Tab is Fortinght and has fortnight gridview ,4th is Monthly and has monthly gridview.
First two coumn named as Start Date,End Date in all gridviewMy Q1: If user enters the start date, end date should be greater than start date,at the same time the data (period) entered in first row sholud not be repeatedfor second row or third row or any row in the gridview.It is applicable for all gridview .How should I achieve it?My Q2(Logic????): When user enter the start date and end datein first gridview(Daily) that period should not be allowed to enter in the second gridview(Weekly)or third gridview (Fortnight) or Fourth gridview (Monthly) and Similarily if I enter the period for weekly then it should not be repeated in any other gird and soo.on.My Q3:How should I add row at runtime in gridview without postback? My Q4: What should I do to get Dataformat inside the gridview
I have a listivew that is assigned a datasource in the code behind based on query string options. From what i have found out, once there is no datasource assigned in listview html then the sort feature stops working automatically and you must put the code in the _Sorting event. I cannot find a good example of this logic.
good example of the listview manual sort logic?