Web Forms :: How To Raise Events On Usercontrols Object From .aspx Page
Jan 7, 2010
I have a login.ascx control with three controls (LoginName, Password and A Button) , I want to rase a click event on this button from .aspx page because some restriction is there so that I am unable to write any code on .ascx page.
I have assigned value on login name and password from .aspx onload events. but I an facing problem while rasing event on button.
I am showing code that I have written on .aspx page that I have putten onload section.
[Code]....
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Feb 23, 2010
I have user control that inherits a base control class and these user controls are loaded using the LoadControl method, I can't seem to figure out how to raise events from user controls to the page that are dynamically loaded this way. Here is the delegate and event in the base user control class.
public delegate void SomeChangeEventHandler(object sender
, SomeChangeEventArgs e);
public event SomeChangeEventHandler SomeChangeEvent;
public virtual void OnSomeChanged(SomeChangeEventArgs e)
{
if (SomeChangeEvent != null)
{
SomeChangeEvent(this, e);
}
}
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Jan 7, 2010
I have a login.ascx control with three controls (LoginName, Password and btnLogin) , I want to rase a click event on this button from .aspx page because some restriction is there so that I am unable to write any code on .ascx page.I am bale to put loginName and password on .ascx by using query string but unale to raise event.
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Mar 16, 2010
I have the usual problem of dynamically created usercontrols not hitting the event handler for a linkbutton inside the control, but I've checked the usual problems and I can't work out what's wrong. I'm calling a function to create the controls at the bottom of my page.load (although I did try page.init as well just in case) outside of my page.ispostback check, and I'm setting the controls id's to a fixed name which is consistent across postbacks. Any ideas what's wrong?
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Usercontrol code:
<asp:LinkButton runat="server" ID="lnkDeleteGroup" Text="Delete this group" />
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Jan 27, 2011
i have the following function in default.aspx.....i have webusercontrol which have 10 checkboxes and 1 button .... i want when i click on button1 of user control then it can access the function of default.aspx ...page ...if i dragged the usercontrol to default.aspx
Normally if i use 10 checkboxes and 1 button in default.aspx then it works fine ... if i use 10checkboxes and 1button in usercontrol then drag that usercontrol in default.aspx then it will not work ..
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Oct 5, 2010
I work in VS 2008. Whenver I add a server control(Label) and set it properties in aspx.vb and build the solution, I get the error "Label1 not declared". While analyzing this issue I noticed that the event handler statements for the Label1 where not added in the designer.asp.vb file. These statement would actually be added automatically when I drag and drop a control to my webpage.
I would also like to inform the scenario after which this problem came to me. I was working in VS 2008 , VS 2005 and VS 2003 in the same machine.Could this have caused the issue ?
Now each and everytime when I add a control, I am adding the "With Events" code in the designer page to make my build succesfull which makes me to spend more efforts.
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Mar 14, 2011
For a "dashboard" module I need to dynamically load user controls based on criteria as the user enters the page (role, etc). The problem is that the events are not being fired at all from the controls
As I understand it I need to load the controls in the OnPreInit method of the dashboard page, however I cannot get a reference to the Placeholder control at this point of initialization (i.e. I get a NullReferenceException); trying to load the Placeholder dynamically via Page.FindControl gives me, ironically, a StackOverflowException.
I've tried loading the controls in PreRender and OnInit as well but the events in the controls are not wired up properly and will not fire.
The code is basically this:
[code]....
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Sep 11, 2010
I'm looking for a way to intercept the ASP.NET processing pipeline in such a way to be able to register event handlers to all events on the Page class. The reason is, I need to maintain a session-bound instance of a component that needs to be notified of all important Page events, starting from OnPreInit.
There's an arbitrary number of Page descendants in the application, which are not under my control. Hence I cannot use an approach like using a single custom descendant, that would notify the session-bound component, as a base class for all pages in the web application.
I don't think creating a custom IHttpHandler or IHttpModule implementation would solve the problem. Also note I cannot create a custom HttpApplication descendant.
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Oct 28, 2010
I have an aspx webpage in which an user control is added dynamically as follows:
UserControl testUsrControl = LoadControl("TestUsrControl") as UserControl;
testUsrControl.ID ="test";
Then I tried adding an event handler of user control inside aspx like below:
testUsrControl.Drpdatafield_SelectIndexChanged += new EventHandler(this.Drpdatafield_SelectIndexChanged);
But this line is giving error at **testUsrControl.Drpdatafield_SelectIndexChanged **. The error is "Drpdatafield_SelectIndexChanged" doesn't exist in UserControl.How can get the testUsrControl's events inside aspx page dynamically.
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Oct 26, 2010
I have a basic ASP.NET (4.0) web site (in VS2010)
I have a few aspx forms with in it..
on default.aspx I have a aspxbutton1
on report.aspx I have a aspxlabel
All I need to know is HOW do I reverence the label from the default page and visa versa..
In the web world things are not the same.. This is just an example .. to prove the point.. but I am trying to copy the settings from one object on page 1 to an object on page2.
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Jan 26, 2011
I am new to asp.net. I need to know the difference between the following 2 methods :
1. double clicking the button placing the code
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
[Code]....
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Apr 9, 2010
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.
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Mar 2, 2011
I desingned a page with tags, Now I want to access object tags in code behind.
This is aspx page code....
<object type="label" runat="server" class="System.Web.UI.WebControls.Label" id="label_priority" parent="-1" bindedfield="priority" empty="1" value="MyValue">
Here I am adding runat=server in object tags it is giving error as
"An object tag must contain a Class, ClassID or ProgID attribute."
then I added class="System.Web.UI.WebControls.Label", now not giving any error but not showing anything in browser.
so My question is how do I access object tags in aspx.cs page? or I want to create a label with object tag that is accessible in code behind.
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Sep 24, 2010
C# or VB.NET are welcome.
I have an <%#Eval("FirstName")%> in the aspx page, I want to replace "FirstName" to <%#Eval(employee.FirstName)%> but "employee" object
is instantiated in the codebehind like this:
Public employee As New Employee
How can I call this object in the aspx page? Should I can create an "employee" in the aspx? if so, how to do that.
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Jul 29, 2010
I am new to silverlight and I am wondering if it is possible to access silverlight object data from the aspx page that host it. Or have silverlight write to a hidden field on the page on client side.
What I am trying to do is to use silverlight to upload file via WCF (client to WCF Service directly instead of posting data back to the web server then forwarded to WCF service). When uploading a large file, user can still do some data entry etc. And once the upload is done have it write some data return by the WCF service to the aspx's hidden field and postback to the server on submit.
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Dec 28, 2010
I am trying to hide or show a certain section of my table depending on the value of a property in my binding object(s).
public class Class1
{
public bool Display { get; set; }
}
In ASP.NET MVC, I can just do the following (assuming that Class1 is the model that binds to the page.)
<table>
<tr>Row 1</tr>
<tr>Row 2</tr>
<% if(Model.Display) { %>
<tr>Row 3</tr>
<tr>Row 4</tr>
<% } %>
</table>
How can I achieve the same behavior in transitional ASP.NET? That "Model" variable is not available. How do I retrieve the data binding object?
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Jun 29, 2010
We need to add 2 user controls to an aspx file, these 2 user controls have one telerik ajax manager each. but telerik only allows one ajax manager in a web page. I am getting exception while running the app.
Is there any way in aspx to seperate the user controls so that it will act as a seperate page?
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Feb 21, 2010
I'm working on a wizard-like set of page, and I'm relying on cross page postbacks to navigate between them.
I need to be able to trigger the Load event on the previous page in order to save the form data for the page.
I've been told that for situations of this sort all I had to do is access the PreviousPage property in the destination page and this would trigger the load event of the previous page but for some reason this doesn't seem to be working.
Is there anything else I can do to explicitly trigger the load event on the previouspage if the PreviousPage property is not null?
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Jun 4, 2010
Ive created an object and placed it in the session, then in my .ashx handler I want to get that object from the session. The problem is that its always null !
heres how ive placed the object into the session from an aspx page
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Aug 21, 2010
In my web application , I have an online application form which contain 4 sections.When I click next button in the first usercontrol for the first section,i need to display the second usercontrol for the next section. When i tried, first loaded usercontrol only applying the styles.
what logic i need to use here to display each usercontrol on the next button click. How to save the values of each usercontrol on the next button click?
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May 20, 2010
I have a user control that contains a repeater. We have added some paging and sorting into the user control and it all works well.
What I need now is a nice way to catch the OnItemDataBound event of the inner repeater and then bubble it up to be accessible directly from the user control from within the page.
We have tried catching it and then declaring it in the user control but it just won't work.
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Dec 1, 2010
i want to write aspx page html from aspx.cs page on page load..
i hav already used div.innerHtml...
i want to write below code in aspx page from aspx.cs page
[code]....
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Aug 27, 2010
We have recently put up a new server with IIS7, where we now have published a .NET4 site.
Locally everything works fine, but on this server the Default.aspx is not working. No events are firing at all for this page. Every other page works as should.
We've tried deleting the Default.aspx and adding a new blank one with just a button event but same thing still applies.
We've spent quite some time troubleshooting this without any results. Same problem exists both with and without using a masterpage.
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Feb 25, 2010
I have an (almost) empty aspx page and I want to insert a certain number of the same user control in this page.
I tried to add them from the CodeBehind but it seems that the UserControls are completely empty.
In the main page (MainDiv is a div with runat="server"):
protected void Page_Init(object sender, EventArgs e)
{
WebUserControl1 uc = new WebUserControl1();
WebUserControl1 uc1 = new WebUserControl1();
MainDiv.Controls.Add(uc);
MainDiv.Controls.Add(uc1);
}
(it doesn't work if i put this code on Page_Init, Page_Load or Page_PreRender)
UserControl (gw is a Gridview contained in the UserControl):
protected void Page_PreRender(object sender, EventArgs e)
{
if (_data != null)
{
gw.DataSource = _data;
gw.DataBind();
}
}
when I arrive there, gw is null (this.Controls.Count is 0).
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Jan 13, 2010
I'm trying to better understand the life cycle of an object in the .Net framework. My companies Intranet has some custom classes that were written by a vendor that I'm trying to make some modifications to. Specifically I want to set some variables & hashtables to null when use of the object is done. For now I have this in the dispose event.
Is there any info you can point to that would be good reading on the life cycle of an object in the .Net framework? I.e. what order do the events fire in? OnInit, Initialize, finalize Dispose, etc. I have the ASP.net page lifecycle but I'm not looking for that.
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