Web Forms :: RegisterForEventValidation Can Only Be Called During Render?
Jun 21, 2010
I am having an strange issue with ASP.NET Master page. I have a dynamic resolution to an image URL
<img src='<%=ResolveUrl("~/images/Generator.gif") %>' />
Sometimes it works, most of the time it generate a crash with the following error
RegisterForEventValidation can only be called during Render();
Description: An unhandled exception occurred during the execution of the current web request. Please
review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.InvalidOperationException: RegisterForEventValidation can only be called during Render();
View 3 Replies
Similar Messages:
Mar 15, 2011
I want to create and render a dunamic page. Something like following:
[Code]....
But at RenderControl line, I get following Error:
RegisterForEventValidation can only be called during Render()
Is there a way to resolve it? At many forums I found set the EnableEventValidation=false in page directive. But this is a dynamic page and has no directive. Further this property is not available when I browse mypage properties.
View 1 Replies
Aug 18, 2010
When i am using cascading dropdwon in my project i an getting this issue
RegisterForEventValidation can only be called during Render();
I tried following solutionEnableEventValidation="false" but still i ma getting thisIf i comment cascading dropdwon it's working fine
View 1 Replies
Feb 18, 2014
How to convert to pdf it is displaying error RegisterForEventValidation can only be called during Render();
<asp:DataList ID="DataList1" runat="server">
<ItemTemplate><br />
<asp:Label ID="Label1" runat="server" Text='<%# bind("question") %>'></asp:Label><br />
<asp:RadioButton ID="RadioButton1" runat="server" Text='<%# bind("answer1") %>' /><br />
<asp:RadioButton ID="RadioButton2" runat="server" Text='<%# bind("answer2") %>' /><br />
<asp:RadioButton ID="RadioButton3" runat="server" Text='<%# bind("answer3") %>' /><br />
<asp:RadioButton ID="RadioButton4" runat="server" Text='<%# bind("answer4") %>' />
</ItemTemplate></asp:DataList></div>
View 1 Replies
Feb 12, 2011
I've been watching a video on Scott Hanselmnn teaching MVC 2 tricks/tips. He mentions how MVC 2 by default uses ASP.NET Web Forms view engine to render the output of the views; he mentions that the web forms view engine is a little slower than it could be for MVC 2 since it generates a control tree and then outputs the HTML to the page (I hope I said that right).
I was wondering what he meant by web forms generating a code tree before outputting the HTML to the page. Does anyone have insight on the view engine of Web forms and the steps of the rendering process works for ASP.NET and MVC2?
View 2 Replies
Sep 2, 2010
I have two versions of a website. One runs on IIS server on a local PC, the other runs on the ASP.NET development environment included on Visual Studio (localhost). Apart from that, the file stucture of both is the same, although only the one running on IIS works properly, and this seems to be related to the fact that the IIS version calls Application_BeginRequest() where the other doesn't.
I've looked at the differences between IIS server and the ASP development environment in: [URL], and it says that IIS and the ASP development server deal with static content in that for IIS in that on IIS static content does not go through the ASP.NET runtime like it does on the dev environment (but I'm not sure exactly what this means).
I've done a number of tests involving images, etc, and have noticed that when the image is of the form:
<img src="Image/MyImage.jpg...>
the IIS server version calls Application_BeginRequest(), but the visual studio development environment version doesn't.
However, if I change the above code to use:
<img src="<%=ResolveUrl("~/Image/MyImage.jpg")%>" ...>
it will call Application_BeginRequest().
In my case, it is necessary to call Application_BeginRequest because this creates a new path and calls
RewritePath().
The problem occurs when using links such as <a href="..." ...>, because if I use static content it won't call Application_BeginRequest() and the path won't be re-written. But If I change it to href=" %=ResolveUrl("~/...")%>" (for some reason, it will only call BeginRequest() if the path begins with a tilde ~), the path is re-written incorrectly.
I'm not really sure how to find out why the IIS version is calling Application_BeginRequest() from all the time (the callstack just says "external code"), or why it is calling it whereas the local dev server version isn't.
If anybody can explain this, or knows of any sites that go into this so I can master the basics, I'd be very grateful.
View 6 Replies
Jan 19, 2011
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.
View 1 Replies
Sep 13, 2010
how come a Null session value that is called, doesn't get directed to the Custom Error Page?
View 4 Replies
Jan 20, 2011
here is the code "when i select a value from calender customvalidator is not called . . "
[Code]....
View 7 Replies
Mar 29, 2010
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.
View 9 Replies
May 5, 2010
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.
View 2 Replies
Dec 8, 2010
I have a dropdownlist on a web form that isn't calling a routine when I click on a new item in the dropdown.Here's my code from the .aspx file
[Code]....
[Code]....
My list is populated with a blank item as the 1st entry and then all the alerts that I have in my database. I originally had OnSelectedIndexChanged but that didn't work either.
View 4 Replies
Jun 11, 2010
I was working on something with Page_Init. I palce a break point and noticed the event is called twice. What happen was:
1) Page_Init is called
2) Page rendered on browser
3) Page_Init is called again
How do I find out what is casuing it to fire twice? Page_load is also firing twice and this is happening on IE.
View 9 Replies
Sep 7, 2010
I can't understand why the method LoadViewState() is not called after the postback in my code below.After label1 cahnges its text the "__VIEWSTATE" hidden field is modified, but LoadViewState() is not called.
[Code]....
View 3 Replies
Feb 23, 2010
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.
View 5 Replies
Jul 17, 2010
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.
View 3 Replies
May 26, 2010
I have LinkButton as the submit button in the web page. The problem I am facing is it is not calling servr side event handler.
The js function for 'onclientclick' is returning true but the method mapped to 'onclick' is not being called.
I tried putting alert message in onsubmit event also, that is also coming.
How to diagonise the issue? What are the possible reasons for this?
View 5 Replies
Jan 11, 2010
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.
Ex : user inputs
TextBox1 (From) : 01012010 =>Press TAB =>Value : 01/01/2010.
TextBox2 (To) : 01022010 =>Press TAB =>Value : 01/02/2010.
But Compare Validator show Error after cursor leaves the TextBox2. If I choose these values from Date Picker => No problem.
I think Compare Validator is called before onblur event. Is that right?
If it is right, is there any way to do my work?
View 5 Replies
Sep 13, 2010
The dropdownlist selectIndexChanged event never gets called. Why is this?
[Code]....
View 5 Replies
Oct 20, 2010
I have a GridView and provide the user with sorting, paging, editing, deleting and selecting functionality.
When the user klicks the delete-button in the GridView, the Row-Deleting event is triggered, the record is correctly deleted from Database after user confirmation. Then the Row-Deleted event is triggered and afterwards the Row-Deleting event is triggered AGAIN, resulting in a second user confirmation and a Delete-instruction running into void if the user confirm again the question.
Between the Row-Deleted event and the second Row-Deleting event I saw the GridView binds his data again (comprehensible because it wants to provide an updated view to the data), maybe somwhow there is generated or provoced the second Row-Deleting event.
My GridView:
[Code]....
The Code-behind:
[Code]....
what triggers the second Row-Deleting event?
View 6 Replies
Jan 18, 2010
I'm having the same issue as posted here:
http://forums.asp.net/p/1157529/1904541.aspx#1904541
I have a web user control that implements iWebEditable, and a custom editor part the implements EditorPart. In my custom editor part class, i define a text box, create the textbox in createchildcontrols() then render the textbox in RenderContents() using the following line:
_txtTitle.RenderControl(writer);
As soon as I add the line above (which displays the text box in the editor part) the functions createchildcontrols and applychanges are called in the wrong order. i click save button in the editor part to save changes to textbox, createchildcontrols() is called first, then applychanges() is called after the editorpart and the webpart (custom control) are rendered requiring me to refresh the page (which is not the desired functionality ;-] ). As soon as I comment out the line above in RenderContents() the functions are called in the correct order: appychanges() first, then createchildcontrols().
View 2 Replies
Feb 17, 2010
when does the constructor on a page in asp.net page lifecycle get called?
View 1 Replies
Nov 23, 2010
http://blogs.msdn.com/b/tmarq/archive/2009/06/25/correct-use-of-system-web-httpresponse-redirect.aspx
http://weblogs.asp.net/bleroy/archive/2004/08/03/Don_2700_t-redirect-after-setting-a-Session-variable-_2800_or-do-it-right_2900_.aspx
I've followed the instructions in the two articles above, plus more and I still cannot get response.redirect to work. I am able to see the url of the page I am trying to redirect to in fiddler but the browser does not navigate to the page. I am using Cassini as a web server, could that be the problem?
Here is global.asax
[Code]....
View 5 Replies
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?
View 3 Replies
Jun 24, 2010
I have the below structure. Admin_note --> AdminBasePage --> System.Web.UI.Page.But Page_Load does not call in AdminBasePage when calling page_load in Admin_note class.Do you know how to solve??
//// One file///
namespace UI.Admin
{
[code]...
View 6 Replies
