State Management :: Retaining The Dropdown List Values Moving From One Page To Another
Mar 27, 2010
I have four dropdowns in the first page and then a button which saves the selected values from the dropdown to a session state .
In the second page I do have previous button which comes to the first page. My problem is that the dropdown values are not getting preserved.
Here is my code for the First page
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using MyBusinessLayer;
using MyDataLAyer;
[Code]......
The problem is that I get the error object instance not set to an instance of an object
I Have the gridview control with 2 dropdown list and 2 text boxes,When the textbox chnaged event happen 1 row will create and the dropdown back to initial values( its not retaining the selected values),I am binding the control after text changed method,Is there any properties needs to be set or any other way we can retain the values in postbacks?
I have a web form with a whole bunch of drop down lists (mainly) that works perfectly well and has been for some time. However, we've found a scenario that seems to corrupt the viewstate of this form in someway, or cause it to lose it's viewstate. The problem occurs when the user has this form displayed, then clicks on a link that opens up another window. A few more steps to open up a second and third window, followed by a write to the database. Then the user closes these windows down, leaving this original window open. At this point, the user selects something from one of the dropdowns. And the app crashes because the dropdowns have lost all of their values (and so a bit of code that is trying to work with one of the ddl's selectedvalues fails).
When the user selects this dropdown, the page_init event fires, followed by the page_load with postback = true. The dropdowns themselves are defined in the aspx page markup, but the values of them are generated and added in page_load (where postback = false). I've relocated the code to populate these controls to the page_init code and now the app doesn't fall over, because the values are re-populated. However, all of the selectedindexes are being reset, so the original values are lost and the screen redraws after this postback with all of the dropdowns reset.
Is there a way for a user to partially fill out a form and not commit it to the database, leave the page and come back to it and the information that the user filled out is still there?
I am in the process of designing a blogosphere that enable readers to leave comments. I want my dynamically added label controls added to the placeholder on the page to be retained and displayed on subsequent requests or postbacks to the same page. how do I go about this? I have tried using View State but it's kind of beyong me how to work it.
I am having a dropdownlist and fill it by providing dataset its working on page now what i want is when i am click on a button page is transfer to another page but from that page when i am back i want dropdown value selected.
ViewState are used between same page Request and Response.
Session variable will stay throuwut the browsing until the Specified Expiration event.
Hidden Input control will be used whithin same page as well.
Are there any good exmples of this differences?
I wants to know the practice use here, because in hte current team, people are not prefering to use viewstate object due to some Heavy load of that object.
So i am try to use Session variable and working fine but can not see in the Viewsource of webpage.
Hidden Input control still make little weight on page compare to session..
i have a requirement where i need to pass values from page1 to page3. In page1 i have 3 textbox and 2 drobdownlist and one button named NEXT. In page2 i have 10 textboxs and button named Next button. In page3 i have 10 textboxs and Submit button. when Next button in page1 is clicked it goes to page2 and then to page3. In page3 i need to submit all the values of page1 and page2 to database. Is there any way to pass all the values of page1 and page2 to page3 without using sessions
I'm having troubles remembering how to grab the list view's state, or page, so that when you leave the list, you can return to the list view page you left on. I have a data pager, and I have hyplerlinks for items in the list view that take you to a file upload or file delete page, and then returns to the list view. It returns to the list view's initial state (first page).
I have a form with a combination of dropdownlists and textboxes that I want to be able to show a user as a summary in another page before submitting to a sql server. Page 1 will have a verify button which will then pass the dropdown and text box info to page 2 where end users will be able to either submit the page or cancel the action. What's the best way to pass the values from page 1 to page 2?
I have a generic handler in which I fill up a Session variable. I implemented the IRequiresSessionState interface, so it shouldn't be a problem.
In a given page, I want to display that value, but it seems like the value is always empty. Is it because the session that is accessed and written to in the handler isn't the same one that is used on this page?
In the handler, I used context.Session["EID"] = "somevalue";
edit: i found out what the issue is but I do not know how to solve it. It's because I have this Java applet which reads out an eID, calls the handler to store the data, but the session used by the applet is not the same as the session used by the browser... so how could I exchange this data in a safe way?
I have a clear button and a textbox in an aspx page. I set the session variable in this page as
String str = Textbox1.Text;
Session["TypeIds"] = str;
and I clear the sessions in a clear button event as
Session["TypeIds"]=null;.
Then when the user types some value in the textbox ,on Response.Redirect on another aspx page, the session variable returns null values.It does not retain its session state. The session state has to be maintained in the next page. Is it because this clear button event and setting explicitly to null creates this problem?
I wanted to know the best practice for caching data. Say I have some control example a dropdown list which is populated from my db. Now this dropdown is global and used across many pages. I was thinking of not going to database everytime to fetch data for this dropdown and put the result in Cache. And then populate this dropdown from cache. Is this a good practice or if there is another approach. Can I store my datareader in cache and then use it globally. Also could I do this in application start event?
I have created a matser page with a two radio buttons, text box and a button. Whenever user sets some values to these control and clicks the button, i will navigating him from one content page to another based on the data he has entered. The problem is after the content page load, the values selected/given in the controls(radio button, text box) are getting cleared.
i have a form on page1.aspx with several controls (textbox, dropdownlist, etc).on Page1 PageLoad event i load data from database and performe databinding.From Page1 a user can, by clicking a specific button, move to Page2.aspx to insert some details and, after saving details, he returns to page1.
if save changes are made on control on page1 before save them to db, obviously, these are lost on return from page2 (because are reloaded on pageload from db).How can i save control status between pages round trip?
