I bind textbox to a property of an object. After running the app, if the value of textbox is changed, I expect the object to update this property .This does not happen. I also understand that I am recreating the object from viewstate on postback, which is wrong. how to persist the state of object on postbacks all.
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i have created a user control UserControl.ascx, in Code behind file of UserControl.ascx i have created an object of a class MyClass.cs,
Like
if(!Page.IsPostback) {
objMyClass= new MyClass();
}
but when i click on button of UserControl.ascx page and try to access objMyClass object then it set as null, so how to persist MyClass object when page PostBack, i wanted to keep object persist till the user access the page, when user goes out of this page then object should distroy?
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I ve been searching for this on various forums and came through a number of supposed solutions which didnt work for me.
My web form works perfectly for me when on development and after publishing on IIS but when I try to access remotely the session value is always null.
I do these things in the following order and when accessing remotely I always get the exception i throw when session is null.
I debugged it and my list is never null when reaching the assignment point.
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in webconfig I have the following tag which I saw as an answer in many forums
<sessionState mode="InProc" cookieless="true" timeout="200" />
I have an object to hold some specific state information in my web application - I pass it back & forward between pages by making it a property of a basepage which works fine, but I lose it on postback.
Is there any way to persist this property without manually adding & reading it again from viewstate?
I create a class with some atributes.In a web form, I declare a public object like this.Partial Class Intencion
View 7 Repliesi want to hold data at runtimeEx-I have a 3 Services A,B,C and in A,B,C contain services list,then if user select A service and 3 services in a A Listagain user select B service and 2 services in a B Listand again user Select C Service and select 1 services in a C listSo How i can hold data A,B,C services ID'S value with respect to services listID'S value at runtime.
View 1 RepliesI have a grid view whose 1st column is Image Field. Now I assign 1 out of 4 images to each row at runtime. I have this gridview in ajax updatepanel. Now how can i persist the images in the first column after a postback.
View 6 RepliesIm binding the gridview in page load.After i click the link button in the gridview it displays another gridview.I have a checkbox in that gridview.I check some of the checkboxes.while i click the save button i want to get that checkbox state whether its checked or not.Bt for me its showing no records in the grid.How do i persist my data and get the checbox's state.
View 3 RepliesI am using Wizard Contorl in one of my project, I want to maintain the state of the wizard control at any step .Let me explain further , let suppose when user is at Step 4 out of Step 10 and then user would close the browser so the state should be persisted and when the user come back again to the same URL the step would be 4.
View 1 RepliesI have a repeater that displays financial data and prices for various stocks.
On this page, I also have an "export" button that needs to take the data ~on the screen~ and convert it into a CSV for the user.
The problem is, after I databind my list of "Stock" entities:
List<Stock> stocks = GetStocks()
rptStockList.DataSource = stocks;
rptStockList.DataBind();
The data is not persisted on postback.
Also, the data on this page is constantly being updated via an UpdatePanel and a Timer control (being re-databound each time). Every 30 seconds the prices displayed for the various stocks in the repeater control change.
Now, I have a linkbutton that has a click event method in the code-behind that is supposed to export the ~data on the screen~ for the user. I need to grab the current values for the list of stocks last databound to the repeater. I can't simply go grab the latest values from the database because those will have been changed in the time between the last refresh.
protected void lbtnExportStocks_Click(object sender, EventArgs e)
{
// No longer have the stock data used in the repeater control
ExportStocksToExcel();
}
I know that ASP.NET doesn't persist the datasource for the repeater on post-back but I need to still be able to either re-construct this list of Stock entities so I can send them the CSV or I need persist it in some way.
I don't want to do anything that is too heavy handed in terms of performance because during certain days of the week this application can have some heavy usage.
What is the proper solution to this type of situation? Should I iterate through the Repeater's "Items" collection and reconstruct the Stock entities?
I need a way to save and load the Page State in a persistent manner (Session). The Project i need this for is an Intranet Web Application which has several Configuration Pages and some of them need a Confirmation if they are about to be saved. The Confirmation Page has to be a seperate Page. The use of JavaScript is not possible due to limitations i am bound to. This is what i could come up with so far:
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I can't seem to find a way to load the Page State after being redirected from the Confirmation.aspx to the PageToConfirm.aspx.
On page1.aspx i hava a textbox with id="tb1"
On page2.aspx I have a textbox with id="tb2"
page2.aspx is set as postbackurl for page1.aspx. For both labels enabl;eViewState is true. Shouldn't the text I write in page1 also appear in the label on page2? Can I implement this without looking into Request headers, and setting the text myself?
I am trying to figure out how to persist the playing of a Silverlight MediaElement playing within a Silverlight User Control embedded in an ASP.NET during postback.
The scenario goes:
Have a media player on a site, press play, continue navigating through site while the music continues playing.
What it does right now:
Obviously the object gets loaded anew on each postback or page redirect (even if it's back to the same page IE: default.aspx).
I've seen samples of how to persist the state of a Control on postback and even complex data through cross-page postback. But nothing that covers my specific case.
Other particulars:
Silverlight 2
ASP.NET
C#
My default.aspx:
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how to make radiobuttons created using Html.RadioButton("id","value") maintain its checked state through postbacks?
View 6 RepliesI have a div lets say :
<div id="foo">
</div>
Now I inserted some html content inside this div on some button click(without postback) . Now when I perform a postback on some action say on server control submit button , I want the html(which I inserted via javascript) be persisted in the foo div. Right now I am thinking to take an hidden input server control and when the form will be submitted I will insert the content of foo div in that hidden control, the next time when the page loads after the postback I will fill the foo div with the content inside the hidden field. Am I going with correct approach or is their any other good approach which I should opt ?
Related to this thread: Gridview CheckBox Persist in Paging
Is there any other option than ViewState or Session to save the datatable ?
I've been trying to add a little Remember Me in my login page and been suffering 2 days with this cookie problem.This is how I set the cookie:
HttpCookie coo = new HttpCookie("test");
Just wondering whether or not Session Variables that are declared and set while in a HTTP session will continue to exist if the users session moves to HTTPS?
View 4 RepliesI have created a really simple custom control to render panels into a page. The code is below. When I use my control and add any webcontrol to it, after each page postback the contents of these child controls vanishes.
I must have missed something really simple but run the example to reproduce this. Can anyone please enlighten me as to why the controls are being 'emptied' of their contents, and how I stop this occuring?
Here is the code for the control
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And here's how I am using it in a sample page:
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We have an applicaiton that was converted to the new framework using the wizard in Visual Studio 2008. When we install the applicaiton in production and change the iis settings to use the 2.0 framework we start to see these errors in the event viewer on the web servers. We are using SQL Server Session State and have 3 web servers in a load balancer. Object reference not set to an instance of an object.</Message><StackTrace> at System.Web.SessionState.SessionStateModule.PollLockedSessionCallback...
View 1 RepliesI have a problem.This particular code when used on local machine is working fine, but when it is used on serverit gives an error like " Object reference not set to an instance of an object.Exception Details: System.NullReferenceException: Object reference not set to an instance of an object._isRefresh = _refreshState == (bool) Session["__ISREFRESH"]; "
View 1 Repliesglobal.asax:-I have defined a struct (my_struct)-I add a List of structs (List<my_struct>) to Application["MyList"] In default.aspx:-I have defined the exact struct (my_struct) and want to cast the Application["MyList"] object to the List of structs.
example: x = (List<my_struct>)Application["MyList"];
I receive this error "Unable to cast object of type 'System.Collections.Generic.List`1ASP.global_asax+my_struct]' to type 'System.Collections.Generic.List`1[_Default+my_struct]'
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View 3 RepliesI have the following tabs. After a postback, the tabs automatically gets focus back to 0. I want it to keep on the same tab before the postback. What's a great way of getting this done.
<div id="settingspagetab">
<ul>
<li><a href="javascript:void(0)" onclick="changeTab(0)">General</a></li>
<li><a href="javascript:void(0)" onclick="changeTab(1)">Site Layout</a></li>
<li><a href="javascript:void(0)" onclick="changeTab(2)">Marketing</a></li>
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I have a asp.net page titled EstMaterials.aspx with a gridview that fills from a SQL table based on a parameter passed to it. The code for calling the form is below.
<asp:UpdatePanel ID="upAddMaterials" runat="server">
<ContentTemplate>
<div id="AddMaterials" style="text-align:center">
<asp:Button ID="btnDecoy" runat="server" Text="Decoy" style="display:none" />
<asp:LinkButton ID="lbAddMaterials" runat="server" Text="Add Materials"></asp:LinkButton>
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I have an a button field set as a link in a gridview. When the user clicks on the link it should open the "EstMaterials.aspx" page with a gridview listing the materials required for this job. If I do not have a parameter i.e, ScheduleWeek.oJob.JobSeqNbr, the gridview fills fine. However, with the parameter listed the gridview does not fill. It appears the form opens without ever looking at the parameter being passed.The page load event is below.
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not IsPostBack Then
If Not IsNothing(ScheduleWeek.oJob) Then
Dim tbl As New DataTable
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