C# - Maintaining Viewstate With Get?
Mar 11, 2011
Upon page reloads I want to retain the values the user had typed in upon hitting submit. I worry about viewstates being cumbersome for pages, both in bandwidth and in time for a page viewer to download the page. I am cheap with my bytes :p
My question is instead of using server controls and such I am having the form on the page do a get to itself and on the aspx putting <input type="text" id="user_email" name="email" value="<%=Request.Form["email"] %>" /> This allows me to not use viewstate. Are there any potential shortcomings to doing things this way? My goal is always for a lighter page and efficiency even if it is more work.
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Jan 14, 2011
I have a gridview with results from a database query and columns where I add linkbuttons to individual cells.
something like:
Dim LB2 As New LinkButton
LB2.Text = "title"
LB2.CommandArgument = "argument"
AddHandler LB2.Click, AddressOf LaunchDocument
GridView1.Rows(i).Cells(10).Controls.Add(LB2)
There is a lot time involved in determining what cells get the linkbutton and I want to avoid going through that process on a postback when a user clicks one of the linkbuttons.How can I maintain these controls in the gridview after a user clicks a linkbutton and a postback is done?Right now the application has to go through the process all over again.
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Oct 9, 2010
Now here is the weird thing. First i am running it locally on the built in vs2008 web server.I load my control in fine, do a postback from a linkbutton, locally on my machine it all works fine, no issue.However when it goes onto my host, it falls over with the message:
Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request.Now i also load controls dynamically and use postbacks and things in the admin area of the site...and that works fine, however my front end just keeps failing? See the code behing below:
[Code]....
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Jan 11, 2011
I have problem getting values from viewstate in GetTopThemes.
<asp:ObjectDataSource
ID="sourceGetTopThemes"
runat="server"
TypeName="DBConnection"
SelectMethod="GetTopThemes"
EnableViewState="true"></asp:ObjectDataSource>
[Code]....
}
[Code]....
when the page is not Posted back, I saved all values in the viewstate.
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Apr 30, 2010
I have been getting this error a lot lately with some of my users, and I had a couple of concerns with view state and I have read so many articles but I am still lost..
1. I use masterpage on all the pages and I need viewstate for some of the pages but..
There is a page where a user will fill out the information and then submit this data to a cgi server, and it is where I get most of the Client Disconnected errors, what would happen if I disable viewstate when they click on that button?
Now when a user browses from one page to another, does the view state from the previous page get deleted? If not how would I delete it?
Does the master page have its own viewstate? Would I be able to make sure none of items on my master page are using the viewstate?
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Sep 24, 2010
I have a shopping cart page (Cart.aspx) that has a button that will (sometimes) post to a third party payment gateway, if payment is necessary. The payment gateway will process the payment and then do a silent post to my website (Order.aspx) so I can update the order status.
Order.aspx always throws an invalid viewstate error, even though viewstate is disabled on the page.
What's happening is that Cart.aspx (which has viewstate enabled) posts to the payment gateway, and the gateway will post it back as part of the silent post. Even though Order.aspx has viewstate disabled and validation disabled, it still tries to validate the __viewstate field it's being given.
I know setting EnableViewState=false will disable the rendering of the __viewstate field, but if another page provides the field, shouldn't it still skip validation? I tried calling ViewState.Clear() on the Page_Init event of Order.aspx, but ViewState is apparently empty. how to get around this? I don't want to disable ViewState on Cart.aspx (in some cases it may be necessary), but I can't figure out how to clear it on Order.aspx.
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Jul 11, 2010
I have a website that returns search results from Twitter, written in C# ASP.NET. The search works very well.When the user sees the results I want them to also have a 'Next Page' type hyperlink that will perform the search from the last previous result onwards (using Twitter's next_page data). How can I preserve properties so that when a link is clicked it will run the search again with different parameters for the next results? I cannot use Form as there is one Form on the page already and MS limits to one Form per page (for runat="server")
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Mar 1, 2011
I'm going to launch a page - that will persist for a really long time using - using ASP.Net.
Page will have very little controls - will using jQuery ajax calls to build up and fill in the DOM for maintaining data in the backend DB.
How do I maintain who I am with the web service?
I'm used to pages that mostly use asp.net membership / session vbl stuff to maintain state.
That's not going to fly with why I'm doing here.
And I guess that also starts into "how do I secure this web service"?
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Feb 19, 2011
I have some problems with maintaining scroll position after postback. First time I experienced the problem was when I (believe) added Combobox control from AJAX control Toolkit and/or UpdatePanel from AJAX Extensions. The problem is when I do the postback on the page the page is loaded at the top and not where I did the postback. Actually, this wouldn't be a problem if it isn't happening on a very large form. I have already tried using MaintainScrollPositionOnPostback="true", but it wasn't helpful at all. I can provide the code if needed, but I don't think it would be of any use because I have comboboxes inside update panels which are rebinded on a button click.
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Mar 25, 2011
I have a gridview which is placed inside div tag to make the grid view to look like having scrollbars
<div id="divgrd" style="overflow: scroll"; width: 350px; height: 150px>
My grid is placed here.
</div>
Now it displays nice view of the grid with scroll bars. I am changing the color of the row selected from the grid. Only problem is if the grid has around 50 rows and I select the 50th row then the scroll bar moves to the top of the grid. I want to stop it and maintain the scroll position. I cannot change the height of the div tag as the grid may be very large if the rows inside is increased.
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Apr 18, 2010
I'm building a payment page in asp.net, however the page where you order your items is run in HTTP (non-secure) on my domain.
When redirecting the user to the payment site, I have to go through a different domain (my payment provider, from whom I borrow the SSL certificate), so my payment url ends up like [URL]
Now the problem is my session is lost, but I store the order in session, so I desperately needs it.
Can I somehow send the SessionID in querystring, and restore the session from it - or do I need to stuff the entire order into querystring ? (Not too certain it'll fit though, it's rather long)
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Jun 19, 2010
I have a page with several dynamically generated DropDownLists. The DDs load and display the correct values on page load. However, when I try to retrieve the values at post back, the DDs all seem to be maintaining the values they had at page load.
All are created in Page_Load;
No test for IsPostBack;
Processing is handled in code below:
[Code]....
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Feb 2, 2010
We are using below class(TypeInterceptor) in one of our project to create the instance of business objects.
To Create any business object, we are using the below code
++++++++++
BLayer.TestBO objTestBO;
this.objTestBO = TypeInterceptor.CreateObject<BLayer.TestBO>();
+++++++++++
I think using this kind of creational pattern makes the application not scalable as the same instance will be shared among all the concurrent users.Is it correct?
Is there any better way to abstract the creation and maintaining instance of business objects
Class code:namespace Microsoft.IT.RelationshipManagement.Internal.CISF.Infrastructure
{
using System;
using System.Linq;
using System.Text;[code].....
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Jul 19, 2010
My site is currently running on IIS 7.5. I have installed SQL Server 2008 R2 on it. When working in VS 2010 on my local machine, what should I do to simulate the db during development? And how would I migrate that data to the db that exists on the server? How would I update my app with the new code? Simply re-compile and re-deploy?
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Nov 15, 2010
This is probably something fundamental and stupid that I've missed, but the various workarounds are causing me such huge headaches that really, I need to understand the basic problem here in order to find the best solution. I have a usercontrol which contains a drop-down list.
<asp:DropDownList ID="ddlOrderStatus" AutoPostBack="true" runat="server" CssClass="textbox">
<asp:ListItem value="8">Pending</asp:ListItem>
<asp:ListItem value="9">On Hold</asp:ListItem>
<asp:ListItem Value="11">Complete</asp:ListItem>
<asp:ListItem Value="12">Cancelled</asp:ListItem>
</asp:DropDownList>
It does nothing in its Page_Load event. This is in turn contained in a page which, in it's Page_Load event does some databinding on some repeater controls on the page but doesn't touch the control containing the ddl. There is no ajax on the page. The dropdownlist is - clearly - set to autopostback = true. The postback code looks like this:
Private Sub ddlOrderStatus_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ddlOrderStatus.SelectedIndexChanged
Dim ddl As DropDownList = DirectCast(sender, DropDownList)
Dim currentsorting As String = Request.QueryString("sort")
Dim currentpaging As String = Request.QueryString("page")
Response.Redirect(String.Format("~/admin/orders/Manage/0?sort={0}&page={1}&status={2}", currentsorting, currentpaging, ddl.SelectedValue))
End Sub................................
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Apr 30, 2010
Our application is on NLB. Now we have functionality where administrator can upload the images, files that user can see. We have two serversserver1 and server2. We are having only one databaseIf user hits the website and NLB directs it to server1 then the uploaded images will get uploaded in server1 only. with the result if user hits the application and it will get redirect to Server2 he will see the data but no image.Platform :ASP.netWindows 2003 server
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Dec 29, 2010
I notice that my generic list is maintaining only one item, i declared it in the aspx.cs page f one of my forms. I am assuming that each time the page is reloaded when I add an item the list is redeclared. How can I stop that?
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May 25, 2010
i have a problem with maintaining a scroll after postback in grid which consists of number of records with vertical scroll bar,when i click on edit link the scroll is moving to top row but not the current updated record i have used MaintainScrollPositionOnPostback="true" and i placed my grid within div tag but it is not working for my grid
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Feb 26, 2010
I have a web page that regularly refreshes on post back, and all of this works fine. However, a user has made enhance the page, which I need with:
1) There are 3 asp.panels on the page, which are scrollable vertically. When the page refreshes, the scroll position returns to the top. The enhancement is to maintain the position of where ever the scrollbar is on postback. How do I keep the scrollbar position on post back?
2) Within each of the panels are dynamically added web controls. These web controls contain gridviews, which are themselves contained inside div tags. These div tags can be hiddened and made visible by an image button. This hidden and visible state is actioned by some javascript on the page. Again, the user has asked how it is possible to maintain the state of these div tags on post back, i.e. those that are closed and those that are visible. Currently, the state is on postback for all the div tags to be visible. How do I maintain the state of the visibility of a div tag during postback?
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Nov 10, 2010
Bit confused about this. I was under the impression that if you added server controls to the ItemTemplate of a repeater then the ID's assigned to those controls would persist across postbacks and the state would be maintained. But it doesn't seem to be happening. Here's my ItemTemplate:
[Code]....
Which populates fine. What I'm looking to happen is for the user to be able to select certain items from the repeater using the checkbox and "process" them (i.e. perform some data operations on those items) on clicking a button which is outside the repeater. Here's my button click code:
[Code]....
But if you step through this, the checkboxes are found and assigned correctly but their Checked attribute is always False.
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Jan 18, 2010
My web parts need to get data from a remote server using TCP/IP. I want to store these application specific settings and allow only an administrator to configure it. Where should these settings be best stored ? I guess these settings could be stored in web.config. I want to avoid manually editing it or build a separate administration application. Could only an administrator only web part edit those settings which could be then available to all the web parts to use ?
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Sep 23, 2010
This probably has been asked many times before but I was wondering how to maintain the ActiveTabIndex of an AjaxControlToolKit TabContainer. The only way I can think of achieving such a thing is to store the ActiveTabIndex in the session and checking for this on postback. Are there any other solutions to solve this problem?
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Mar 28, 2010
I would like to wrap a RenderPartial in a JsonResult so that my jQuery can handle placement/positioning of the html data based on additional Json parameters.
e.g. {html: <string returned from RenderPartial>, typeofdata: 1}
After Googling, it seems that the only way to do this is a workaround that hijacks HttpContext in order to spit the PartialViewResult into a string. However, this seems like it would break testability.
Is JsonResult not intended to be used with RenderPartial?
Alternatively, I could set typeofdata as a parameter of the model, and have the PartialView render it as a hidden field, then have jQuery look for it. What is a better way to generate the data that I need?
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Feb 16, 2011
project is built using ASP.NET MVC 2.0. There're some pages is run under https and the rest run under http. Follow the artical I found on StackOverflow (http://stackoverflow.com/questions/2414327/switching-between-http-and-https-in-asp-net-mvc-1-0 ) :1.For pages that need to run under https I just add the attribute [RequireSSL] for the corresspond action method.2.To force all the rest pages run under http I have overriden OnAuthorization in the base controller:
protected override void OnAuthorization(AuthorizationContext filterContext)
{
if (!Request.IsAjaxRequest())
[code]...
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Dec 14, 2010
Have a project where I need to access a RSS feed. The issue is this RSS feed, you need to be logged in as a user. They have a simple web form (login + password).
1) Post a web form with my login and password
2) Maintaining Session (w/successful login), do an additiional GET to retrieve the RSS feed.
I am doing this in an ASP.Net page so it all happens server side in VB.Net
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