Web Forms :: Better To Use - Load() Or PreLoad() Events ?
Aug 19, 2010
Since PostBack data and viewstate data are available and initialized to their respective controls at the time of page PreLoad() event ,i want to know then which place is better to use - either PreLoad() or Load() event for dynamically checking my controls status ?For the last one year i was blindly using Page's Load() event .Why i was using Load() event ? I think the same logical part can be done in PreLoad() , since data are available at that time .But what is the main difference when i use my logic Here(PreLoad event) or there (Load event) ?
Is there a technical reason for the existence of Page.PreLoad or is this just convenience to have a place where you can neatly place code that always have to be executed before the Load code? Is there a difference between adding code in the PreLoad event handler and adding code at the top of the Load event handler? And what would be a typical scenario where you use PreLoad?
I have pages with lot of controls (datagrid, treeview, listview, checkboxes itd...). Each control have event usually SelectedIndexChanged and that is ok. On page load, I read default values from database and set controls selected or not. Problem is that in this case fires every damn event of each control and causes problem with loading page. I want to completely turn of runing of all events while triggered from page.load event? Is there nice solution for this? I dont want to mess with RemoveHandler and AddHandler in page.load procedure (although I tried to remove handler, change selected index and then add handler, all in same page.load procedure but it doesnt work).
Is there possibility to turn all events for load procedure, or to use another procedures (init, preinit, loadcomplete, prerender...) to store default values readed from database?
Or can I somehow figure out from witch procedure is called event, then I can implement something like this to skip executing event:
I'm working in 2008 and cannot find out how to simply add the preload event to the code behind. In 2005 I just simply double clicked on the event in the list and it would set it up for me.
I used Photoshop/ImageReady to create navigation buttons with rollover effects etc and it outputed two sets of code - one is a preload script and the other is the main code that displays the buttons. I want the buttons to go in a Master page, either in the page itself or in a header control .ascx file (could use advice on whether one is better approach than the other). In any case I'm not clear on how to include the javascript preload code, shown below. Should the navigation menu buttons go in the master page, or in a header control, and if so, does it go in the <script runat="server" > </script> area? I'm using VB - is the code below alright for VB?
Is there a way to preload images using asp.net c#? I'm populating 45 photos randomly from database, and display those photos in datalist control item template. I would like to be able to preload those photos that way the users are not seeing the "painting" ..
On a page with some user controls, I need to execute some lines of code only once (i.e. not on postback), however, the code must run after ALL page objects complete loading.
Example, Page1.aspx also contains uc1.ascx and uc2.ascx. If I imbed the code in a if (!PostBack) code block, it will end up running before the corresponding page load is completed for uc1 and uc2.
Is there a way to run the code on Page1.aspx once AFTER all the objects on the page have run thru their page load events?
I've googled a bit for the exact order of all gridview events relative to and where inbetween page events. The only Microsoft article: [URL] is not very clear. I'm especially interested in the gridview row_command event relative to page events.
I have been tasked with designing a scheduling system to fit into an existing application. At present I have a SQL Table - Tasks which have a StartDate and EndDate column.
I have a requirement to set the Task as a recurring task i.e. Replace server backup tapes every day, or, Order more stationary once a month.
I am lost on how to design this. I can't seem to find a proper example on the net. can someone point me in the right direction.
I am using swfupload to upload files on a website, the problem that every time the user open the page which contains the upload button, the page loads completely then the flash file start loading from scratch every time the user visit the page with no cache. Is there a way to preload and cache .swf files in my asp.net page?
I have a page with 2 Controls, a ListBox and a DropDownList.
In the DropDownList you can select a PLACE.
In the ListBox you can see all DOCUMENTS for the selected PLACE.
If you select a DOCUMENT, the program does a redirect on the selected DOCUMENT.
So, there are an AutoPostBack and an Event (if you select another Item) on both Controls.
The problem is: If I select a PLACE, then I select a DOCUMENT (the pdf document is opened), and then I go back on the page and I want to select another PLACE, the program doesn't select another PLACE, but opens the old DOCUMENT, because there are 2 Events, one to change the PLACE and one to open the DOCUMENTS.
I have an asp.net C# website. Because of iPhone doesn't support flash i want to change a theme of my site on page load or init if user using it. Could any one show me (code in c#) how to determine that user is browsing my website using iPhone or iPad, not a blackberry, or android etc.
i just want to use a calendar with events like date selection update,delete,creat events. and i want to do this with sql server 2005. I started my project with webApple.
and the secound, i just cand find whats wrong in this
Just I started learning MVC pattern, of course i am learning it from Microsoft's website.Just i want to gather quiz information from the experts. My understanding is (correct me then and there)
1 ) MVC does not support server side events, but supports client side events. If it supports client side events, I need html page with jQuery/Javascript (view), but most of the example I absorbed is to display the information(model) in view, I did not see any client side event handling happens in view.
2) Except ViewState and controlState, MVC supports Sessions, Application State management, Cache management.
3) When request goes to MVC engine, the routing module routes the request that is picked up by the controller. The controller in executes the appropriate action and returns the appropriate view.
Have a look at below link. In that page if you mouse over on any thumbnail image a div opens with that image details with larger size. But there is a point to notice usually when an image gets downloaded in the browser we see that the image loads in parts from top to bottom. In this case the whole is loaded but in blurred state and gets cleared after fully downloaded.
Sample Link
I just wanted to know how this is achived? Does it require to code something or it is any javascript or dhtml?
I added a Input (Text) control in my web form and turned it into an HTML server control so its an instance of HtmlInputText class.
If I double click on the control It only adds a OnClick event handler method inside the script tags in the HTML doc of the web form but how to I get to handle its Serverchange event exactly? does VS.net 2008 has no ability to auto wire up the event to the control, do I have to manually wire up the event handler?
I hv Declared two Master page one Is Base and Derived.. Base Page Load is working but when i hv written load controls in Derived Page Load Using C# it's not working..
I use a masterpages with 3 buttons at the end of the file because al these buttons must be displayed in all content pages. Now I want to call the button_click event in all content pages because the event will be different for each contentpage. My question: How can I call events from controls in the masterpages, in the contentpage?
I will go into the background of why i am wanting to do this if necessary but in short. I want to create a WebControl which has a button on it. I provide the most simple of examples to understand why it is not working.
No matter what i try my button event doesnt seem to fire. the code for it is here:
I have started this small project but somehow feeling blank all of a sudden. anybody with pieces of code and structure . Project Specifications
 Use an SQL Server Database  Show an entry form after the user presses "Add Event"  Save appointment data to the database after the user presses "Submit"
