Web Forms :: TreeView TreeNodePopulate Event Called Before Page_Load?
May 20, 2010
I have a TreeView on a page which I will populate the nodes on demand and a checkbox, and they are in the same updatepanel. I can dynamically add new nodes to this treeview. But when I click the checkbox which will cause a postback, the TreeNodePopulate is called before the Page_load and it will regenerate the nodes that was added before. I was very confused how could this be happened. Is this related with PopulateOnDemand and Expanded priorities?
Please have a look at my VB/ASP code and tell me if you can see what's wrong (I have bolded the important segments):
[code]...
Basically, I'm trying to get the Page_Load subroutine to execute on the page load, but it doesn't seem to be called. I'm assuming that because I set my feedback label to "feedback" in the Page_Load subroutine, I should see it displayed on the page saying"feedback" on first loading the page and every time I refresh. But this doesn't happen. I'm lead to conclude that the Page_Load subroutine is not being called on the page load.
Initially in my website page_load for the landing page say test.aspx was called twice everytime when it was getting loaded. Since my application is an upgraded one (from VS 2003 to VS 2005/2008), I commented the "this.load" event in InitializeComponent and it is working fine, when user first logs in, into my web application. But then, whenever user navigates to this page from any other page in my application, page_load gets called twice.
I have a page, which load a tab with usercontrol this usercontrol inturn loads an another usercontrol that has treeview. Issue: On (!Postback) of treeview control page_load, this load is gettting called twice. it is not callign the page_load of page but just the control page_load twice.
Tried: changed autoevenwireup from false to true, true to false (no change) Add/Remove of EnableViewState="true" ViewStateMode="Inherit" doesn't make any difference.
but if i add another usercontrolB and load that instead of this controlA, the ControlA still gets called on page_load once and ControlB also once.
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:
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:
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.
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.
Code:
private void Page_PreRender(object sender, System.EventArgs e) { //does not fires the Click event of dynamically generated LinkButtons GridView1.DataSource = getDataTable();
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
[Code]....
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
[Code]....
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.
I'm working on a web application using VB.NET. In page load event am calling a remote web service which take time to bring the data. During this process none of the other contents on page are shown(render).
I want to call this remote web service asynchronously so that other data of page is displayed and web service data will be displayed when its available.
Page_load event fires two time in firefox and the same page is working fine in IE. What might be the problem? If it is problem with Autoeventwireup then page_load event must fire two times in IE too. I believe it is not a issue of Autoeventwireup.
I have a dynamically created user control which is accomplished usingLoadControl().
When I debug, the LoadControl call is called once, however the Page_Load inside the user control is called twice. On each occasion, the postback property is false, so it seems somehow the Page_Load event is called outright 2 times and nothing to do with any postback?
In my web form, i am having button named "btnSave" and there are some textbox controls (to name few, Emp Number, Full Name, etc). I've added RegexValidator to the textbox controls as below:
<asp:RegularExpressionValidator ID="employeeNumberValidator" ValidationExpression="^[0-9]+$" ControlToValidate="txtEmpNumber" ErrorMessage="Only integers are allowed" runat="server"> </asp:RegularExpressionValidator>
This RegexValidator will check for emp number textbox contains only integers and if not, it will display message "Only integers are allowed". Now, in my btnSave_Click(...) event, i am first validating whether the textbox contains data and if not, then i am highlighting the textbox in red. When txtEmpNumber contains non-integers data and if i click the Save button, the code in inside btnSave_Click(...) event is not getting called. But when i provide employee number in expected format and then click Save button, then the code inside button click event is getting called without any issues.
I am not sure why my btnSave_Click(...) is not functioning when Employee Number has data in incorrect format.
I have a situation in which i have a textbox which has a text_changed event. User enters the value in textbox, presses 'tab' after that text changed event gets fired it makes bit calculation, after that user clicks the button to save value in database. Problem arises if user does not press tab or click outside the textbox after filling the textbox and presses the submit button. text change event gets fired but not button click, user has to click the button again.
I have a text for user inputs Date. There is a CompareValidator which is used to compare Date between 2 TextBoxes. User do not need to input separator. After finish inputting value, he presses Tab to call a Javascript function to Format value of this Textbox.
