Web Forms :: Detect Button Clicked In Page_Load Event?

Aug 14, 2007

How do I detect which button was clicked, early in the page lifetime cycle, before the corresponding Click event handler is executed? I would like to suppress execution of certain expensive data retrieval/bounding code in Page_Load, if some "go to the next page" button was clicked.

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I have a very common problem with asp.net . I have designed a webpage that performs some action on its load event but whenever a user clicks on back button those actions are not performed as Page_Load event is not called.I have searched a lot of forums but wasn't able to get a exact answer. All I was able to know that it was happening due to cache memory maintained by browsers. I don't want to delete that cache. I want browser to work in normal way.

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I have three button control on my web page. I want to know which button has caused the postback in the PAGE_LOAD event. How can I do it?

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i am creating application in asp.net.

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I've got a tree-view with items the user can click. In this event I trap the selected node of the TV changing


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Jan 16, 2010


The whole thing is in a form, and it doesnt postback when this button is clicked. Im no good with javascript, but i got a feeling thats not the problem.

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This should be an easy solution but I get stuck with it and hope I can get some advice/guidance from you:I have a simple aspx page with a Paypal button in it. The code shows in .aspx page:


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Every time we click on a button. the Page_Load will fire first.

For my case, I have some controls added programmatically to the GridView, when the button click, the Page_Load event fire, my controls just go away.

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Obviously I am a total noob and this is simple to some of you, but I can not figure out why the rest of the sub works, but the button1.Text="Uploading, Please Wait..." seems to be completely ignored.

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I have added a User control to my web page. inside the user control I have an ImageButton for which I have implemented an onclick handler.

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Jun 11, 2010

Gridrow Button click loads aspx Page1 which is a Modal window(window.showmodaldialog). It has an ascx in it called UC1. In my Page1 following is added.

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I am assuming this is avoiding Pageload event of Page1 when the same gridrow button, who opens up Page1, is clicked the second time. Please note that after second click I can see the page1 with all it's controls but when I try to debug, I see that it does not raise the page load event the second time. It's as thought the page had been cached or the same frame is gettign loaded.

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I have page on which I've a login control in which I've a subnit button. The problem is this that when I refresh the that page the submit button or any button that was clicked last before page refresh gets its click event automatically fired.

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I have a gridview were I dinamically (on the code-behind) create all the columns. Because of the type of information that I want to show I have to create some templatecolumns.

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Onclick Event Not Firing When Button Clicked?

Feb 3, 2011

I have the following code and no matter what I do onclick event for button is not firing. I tried deleting the button, the pages. Redid the code. Moved the web project to a different computer and nothing. It worked a few hours ago.

Code on the web control .ascx:


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I have created a website that uses dynamic user controls. I placed a button in a dynamic user control but its need to be clicked twice to fire event. First click doesn't work, but subsequent clicks work. What should I do?

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I have a GridView where I have a ItemTemplate and where I have set 5 rows to with a buttoncontrol on each row.What I am trying to do is in the _Click event of the button, detect which rowIndex this button was clicked on but are not sure what I am missing in this code ?


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How do I check which LinkButton is clicked in the Page_Load of the page. This is to avoid calls to service so that it only executes what is present in its event.

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I have a asp page with tow buttons search adn enter and asp required field validator in it, what I am trying to do is validate the input only when the enter button is clicked not the search button, right now when the search button is clicked it validates and throws an error.

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Web Forms :: Detect The Window Close Event?

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I am currently working on a project in which I have a page where the user clicks a hyperlink to open a window, which loads another page. After selecting some options and pressing a button, the new window closes, and the options that they chose are stored in Session variables. What I am trying to do is detect the window close event so that I can update the original page with the options chosen by the user.

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I'm sure i've not had this problem before & don't know how I can fix it. My dropdown is bound to a SqlDataSource control. However in the page_load event, the control has 0 items in it? I want to be able to select a default value for the dropdownlist in the page load event.

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Jun 19, 2010

I open a pop up window by window.open, then after selecting value from grid link i need to move my parent page as i am doing like

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Web Forms :: How To Detach The Page_load Event, So It Will Not Fire

Nov 16, 2009

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Web Forms :: ImageButton Always Calls Page_load Event?

Feb 11, 2011

I'm using ASP.NET 3.5 and C#.I load an SqlDataSource into a DataView on my Page_Load event. My SqlDataSource queries arandom record from the database. On my page I have an ImageButton, which when clicked uses a Response.Redirect("AnotherPage.aspx + "random id from database"). My problem is that when the button is clicked it fires the Page_Load event before the Response.Redirect takes place in the button_click event. This causes the current data(the users "id") that I had pulled from the database to be overwritten with new data(a different "id") from the database. So essentially the the page is redirecting to the 2nd random id that is queried from the db after the button is clicked and Page_Load is fired again, not the original id. Here's my code, hope it makes sense.Here's my Page_Load:


Then my Button_Click Event:

protected void btn1_Click(object sender, ImageClickEventArgs e)
Response.Redirect("~/Profile.aspx?id=" + id1);

Can I put my dataview in another event or method so it's not called when a user clicks an ImageButton. Also I want the DataView to be repopulated on a postback/page refresh, just not on button clicks.

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Web Forms :: Event Handling In PreRender Vs Page_Load?

Jun 29, 2010

I have a GridView, here I am adding the LinkButtons at runtime to the GridView cells. I am also attacing an click event on these LinkButtons.

The issue is that when I populate the GridView from the Page_load the LinkButton click works, but if I move GridView polulation code in the Page_PreRender event the click event doesn't executes.


private void Page_PreRender(object sender, System.EventArgs e)
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GridView1.DataSource = getDataTable();


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Web Forms :: Create A Checkboxlist In Page_load Event?

Oct 25, 2010

I have a little question about building controls at runtime.

In my case I would like to create a checkboxlist in my page_load event


This control is a part of a wizard-Control. At the end after clicking the finisch-Button, the selected values have to sent by email to me. My question is, how can I get the ID of the Checkboxlist-Control whitch was build at runtime?I tried following workaround


But I get following error-message:

System.NullReferenceException: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt. Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

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Web Forms :: ContentPage Controls Null During Page_Load Event

Feb 6, 2009

So I'm having a bit of trouble - I have a Content Page inside a Nested MasterPage. This Content page contains several controls (labels,dropdownlists, etc.) that I cannot access during the Page_Load event of the Content Page, because they're null. What am I missing conceptually? Shouldn't these controls exist already? Just to clarify, I am NOT trying to access controls on either master page. I'm strictly trying to access controls within the content page itself.

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