Page Postbacks And Event Handling?

Mar 8, 2010

how ASP.NET handles page postback and events?

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Similar Messages:

How To Raise Load Event On Previous Page With Cross Page Postbacks

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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Handling Browser Close Event And Page Refresh

Nov 16, 2010

In our application we need to handle browser close event. When a user directly closes the browser, we should give him an alert message and stop him by directly closing the window based on some conditions. This we have handled through body onunload event. The problem is we are getting the alert message but after showing the alert message the window gets closed.

Is there any way to stop closing the window on click of browser close event?

And also when the page is refreshed, the last performed action is getting fired again.

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C# - Handling MasterPage Event In User Control Of Content Page?

Aug 23, 2010

On my master page , I have "Search textbox" and "Search Button".On My content page , I have a "User Control" which has a "GridView".It shows some data about Vendors.Also, on this User Control's Page Load, i have code written to display all vendors in GridView.Now, when user enters Vendor Number in "Search textbox" , and hits "Search Button" , i want to handle this event inside my User Control.How to do this ?

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Web Forms :: Event Handling Of User Controls Inside Master Page

Mar 4, 2010

I am trying to catch an event that is in a user control inside a master page contentholder and refresh the content page. I am having a hard time finding a good example. Even on this site I am timing out on search.

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Web Forms :: Handling MasterPage Event In User Control Of Content Page

Aug 19, 2010

On my master page , I have "Search textbox" and "Search Button".

On My content page , I have a "User Control" which has a "GridView".It shows some data about Vendors.

Also, on this User Control's Page Load, i have code written to display all vendors in GridView.

Now, when user enters Vendor Number in "Search textbox" , and hits "Search Button" , i want to handle this event inside my User Control.

How to do this ?

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Why Aren't All Controls Initialised At The Event Handling Point Of The Page Lifecycle

Jan 29, 2010

I have a user control embedded in a web part. It has the following snippets of code:


Why are some controls initialised and others not? How do I get around this if I'd like to update the Text property on currentPageLabel?


I've placed breakpoints all the way through the page life cycle and found that nextButton and currentPageLabel are never initialised. The breakpoints were placed at OnLoad, CreateChildControls, goButton_Click, OnPreRender, Render and OnUnload.

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VWD 2008 Handling Each Button's Click Event On Each Page Using The Single Code Behind File?

Nov 12, 2010

I have a website that contains several aspx pages linked to a single aspx.vb code behind file. Four of these aspx pages have a single button on each (four total). My issue is handling each button's click event on each page using the single code behind file.

My four buttons' names are:


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Creation Of Custom Page With Custom Tags, With Event Handling?

Mar 8, 2010

I am trying out some code which enables me in creating a page with extension .asp2

The tags included will also be custom, something like:


I have done the necessary changes so that ASP.NET identifies the extension. I have also kept a mapping of custom tags and tags with myself. With this I am able to render the page on browser. But how can we do event handling(usually done by page postbacks and code) in such a scenario?

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MVC :: Event Handling In MVC?

Jul 15, 2010

Im new to MVC. How controls events are handled in MVC (like Textbox_textChanged event in MVC)

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Event Handling Without Delegates?

May 4, 2010

why delegates are using in event handling?what is the advantages of using delegates in event handling?

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User Control Event Handling

Jun 5, 2010

i have some problem with my userControl. Pls look below for better understanding. Pic1. The default page. When i click on the links on the left, userControl will load into the placeHolder as in pic2. But when i click on the Clear button that is inside the userControl, instead of clearing the text in the textbox, it load back to the default page show in pic1. Can anyone pls advise me what went wrong?

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Web Forms :: Postback Event Handling?

Oct 5, 2010

According toMSDN[URL]Postback event handling:If the request is a postback, control event handlers are called. After that, the Validate method of all validator controls is called, which sets the IsValid property of individual validator controls and of the page."It is my understanding that the Validate method of the validtor controls is called after Load but before the control event handlers.The text quoted says its after the control event handlers.

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Web Forms :: Event Handling In Framework?

Mar 8, 2010

As I am new to .NET framework.I have a doubt in Event handling. For example to handle a button click we write a delegate as private void button1_Click(object sender, EventArgs e)In this function I can change the sender object value means I can do what ever I want to do with Button object.Why this is implemented in this way in Framework.Is this good to do so.

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Cross-page Postbacks And Back Again Retaining Data From Source Page?

Sep 17, 2010

Is it possible to use cross-page postbacks (or a similar method, perhaps Server.Transfer) to post form data (say, Data-set A) to a page, which then allows the user to add some additional information (say, Data-set B) and then postback to the original page the complete set of data (A+B) which then flows through the normal event execution process, similar to as if all data A+B was submitted on the original page to itself in a normal postback?

I don't want the second page to have any type knowledge of the original page, it just needs to supply two additional feeds and send the data on. This way different pages and controls could use this method for gaining additional data.

For example:

Page 1 could have a form with various text inputs, and two hidden fields Hidden1 + Hidden2 which are empty.

When the form on page 1 is submitted the user is presented with page 2, they complete that page and then all the form data from page 1 is posted back to page 1 but with the hidden fields 1 + 2 complete. Page 1 then has all the information it needs to complete.

I'm thinking that perhaps page 2 just needs to use PreviousPage and take its post data, add to it and then post it back to page 1, but as if it came from Page 1 and not Page 2. But I'm not sure if this is possible and ASP.NET might read this as tampered data?

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Dynamic Event Handling Within A Custom Control?

Jan 4, 2010

I have a custom control which contains (amongst other things) an imageButton.

I'm adding a handler to the "click" event of the imageButton however when the button is clicked the handler routine is not called. where I am going wrong with this? should I be handling the click event in some other way?

here is my code:


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Web Forms :: Event Handling For The Dynamic Controls?

Feb 5, 2010

In one of my ASP.NET webform application I want create dynamic controls and add Event handlers for those dynamic controls..For example when I click a button I want to display a list box and I want to add
SelectedIndexChanged event for that list box.I have errors in doing this... Here's the code I tried out... I think there are errors due to my lack of knowledge in postback



DLabel is a existing label control...*** When I click the button I get the ListBox... When I select the Item 1 the page reloads and nothing is displayed in the Label.

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Web Forms :: How To Client Side Event Handling

Sep 8, 2010

i should handle a event whn my focus chages from one text box to other....[ i should get an error as you are not entered the data(it should accept only numbers) ]

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C# - Webforms MVP Passive View - Event Handling?

Mar 14, 2010

Should the view have nothing event specific in its interface and call the presenter plain methods to handle events and not have any official EventHandlers? For instance


My intention is to understand the benefits of each style and not just a blanket answer of which to use. My main goals is clarity and high value testability. Testability overall is important, but I wouldn't sacrifice design simplicity and clarity to be able to add another type of test that doesn't lead to too much gain over the test cases already possible with a simpler design. If a design choice does off more testability include an example (pseudo code is fine) of the type of test it can now offer so I can make my decision if I value that type of extra test enough.

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Web Forms :: Event Handling For Dynamic Controls

Jan 19, 2011

I have created radiobutton list dynamically in my app'n...can any one tell me how to handle the selectedindexchanged event for the dynamically created radiobuttonlist. I just want to capture the value of radiobuttonlist and store it in the database.

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Web Forms :: Dynamic Buttons With Event Handling?

Mar 1, 2010

I am not sure how to do this. I have part of it working and I think I understand why it isn't working, I just not sure what I have to do to fix it... I am dynamically placing some data into an ASP:Table from a DataSet. This is all done from the Page_Loud event. I am looping through the dataset by going through the rows no problem to display the data in cells added by rows to the asp:table.

What I am also doing though is adding a button for each row that is to run an Access insert query that adds a record in a log table.I have used the following code to get this to work which it does, most of this is called through functions in the Page_loud event. this is the gist of it:

this is in a loop of the DataSet
for (int i = 0; i < dsResult.Tables[0].Rows.Count - 1; i++)
Button btn = new Button();
btn.Text = strDynamicText;
intTID = dsResult.Tables[0].Rows[i].ItemArray[5].ToString();


Here is the problem I am having. The button does display for each row, and the query does execute and run when I press the button. The values being passed in intTID and intUserGroup (are global), are suppose to be different for each row though, and are to insert a unique table ID, and a different group depending on what is in the dataset. Problem is, it is only assigning the last tableID from the result set into the button and will always pass that same ID no matter what button is pressed. This is the same with the intUserGroup. It needs to dynamically have differnent table IDs passed but that's not happening. What do I have to do differently to make sure that when the button is created dynamically it will pass the unique values for each row?

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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)
//does not fires the Click event of dynamically generated LinkButtons
GridView1.DataSource = getDataTable();


View 3 Replies Handling Back Button Event After Logout?

Aug 8, 2010

In the logout link button click event I have cleared the session variables.I am checking these session variables for null values at each page's load event.If it has the null value redirecting them to the login page.But the problem is whenever I click the browser back button,the page_load event won't get called.For that I have cleared the the browser cache history.

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C# - Handling Button Click Event Before OnPreInit?

Mar 18, 2010

have a data access layer, a business logic layer and a presentation layer (ie. the pages themselves). handle the OnPreInit event and populate collections required for the page. All the data comes from an SQL server database and I do not use caching.I handle a button click event to grab values from a form and insert a new object into the database. The problem is that by the time I handle the click event, the collections have already been populated, so the new item which has been inserted into the database has not been retrieved.What is the accepted solution to this?I could insert the new object directly into the collection and re-bind the GridView, but the SQL query selects only a set of objects and the new object could fall outside of this set.

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Using Update Panel In Page For Partial Page Postbacks?

Dec 30, 2010

I am using update panel in my page for partial page postbacks. I have gridview and a button "Export" which on click will call the Export method from the below class. If I remove the update Panel everything will work as expected. But if there is a update panel it will not work and throws this error.

Below is the code for the

using System;
using System.Data;
using System.Configuration;
using System.IO;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;


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