Reload The Viewstate Of Usercontrols During Postback?
Aug 27, 2010Is it necessary to reload the viewstate of usercontrols during postback? I want to know in which case viewstate is set by default.
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Dec 15, 2010I have several dynamic usercontrols that I want to load them in separete tab panles.but my problem is when the postback occures my usrecontrols diapeare.however I want to keep my usercontrols in each tab panle in each postback.I mention that I write code in c#.
View 30 RepliesState Management :: How To Keep Usercontrols In Each Postback
Dec 23, 2010I have several dynamic user controls that I want to keep them in each postback. but the problem is when I click on menu item at first time, every thing disapeare in my page! even the things I created on design time. would somebody please help me to find out the problem of my code?it's realy urgent!!
[Code]....
Dynamic Creation Of Usercontrols Without Postback?
Jan 17, 2011As the title says , i'm looking for some kind of technology that allows me to dynamicly add & remove usercontrols.Without a postback ofcourse :)A link would be awesome , example code would be super!
View 1 RepliesC# - Reload A Dropdown On Postback?
Feb 3, 2011I am populating a dropdown on page load and the user selects an item, click a button (to create a new site in sharepoint) I then want this new site to be shown in the dropdown but I can't get it to work properly. Either the items are duplicated or the selected value is null.
so on page_load I have
getSites();
if the page is a postback I want to reload the dropdown with the new item
if(Page.IsPostBack)
{
getSites();
}
but this of course duplicates all the values so I tried
if(Page.IsPostBack)
{
ddlSites.Items.Clear();
getSites();
}
But even if the site is reloaded with all the items and I select one the value is null, why is that and what should I do to fix this problem?
C# - How To Force A Control To Reload The Postback Data
Jan 25, 2011What is the best practice to force the postback Data and ViewState data to be re-loaded on the code behind?
The reason I ask this is, i have one gridview which is generated dynamically and I when it is structure is generated the postback data is already loaded and I want to forse asp.net to reload the postback data once I have my gridView structure is generated.
How can I achieve this?
Google Chrome To Full Page Reload On Postback?
Sep 27, 2010I am creating one of my first Asp.Net tools and I ran in to a small bump. Currently I am doing a postback on a buttonclick which does some server-side calculations. The server-side code then uses those calculations to alter the contents of a div. In IE and Firefox when a postback happens, the div updates as expected. However, in chrome all postbacks do a complete refresh of the entire page. What is causing this and is there a way around this behavior?
Update:
ClientSide I have the following..
<asp:Button ID="Button2" Style="float: right" runat="server"
OnClick="S_ButtonClick" Text="Calculate" />
Which calls a method summarized as so.
protected void S_ButtonClick(object sender, EventArgs e)
{
//Code parsing values from textboxes ect.
//Do Some Calculations
//Output Results
outputDiv.InnerHtml = "<h2>Foo</h2><br/>";
outputDiv.InnerHtml += "Bar: " + calcValue;
}
It is possible that when this postback(if I understand this correctly) happens, that it is still fully reloading in firefox and ie, but it doesn't show it. This effectively masks the postback. However, when I test in chrome, any postback completely blanks the page before reloading the state. Hopefully this clears up exactly what I am asking. Also, my C#/.Net usage might be slightly flawed and I am willing to take comments on such.
Web Forms :: How To Detect Page Refresh Or Reload Apart From Postback
Oct 23, 2013I just want to know how to detect a page is refreshed or reloaded apart from Postback. Just clicking the reload button in the browser...
View 1 RepliesHow To See If Viewstate Changed When Postback
May 12, 2010well what i want to find out is how can i figure out if some change occurd in page when postback , i mean when the first state of the page hahe any changes after postback . I thought maybe somehow to compare viewstaes but i can not find out how can i do that.
View 13 RepliesViewstate Getting Bigger After Postback?
Apr 8, 2010I have a grid with rows of data, but the page will fail have several postback. I check it with fiddler and find that view state expands 2-3 times after each post back.
The thing I did to trigger the post back is searching and sorting. I am not sure how it happens.
Viewstate - Getting The Old Value Of A Control On Postback?
Feb 9, 2010I want to be able to find the old value of a asp.net control (textbox, checkbox etc) without relying on events (e.g. OnTextChange event). Something like "someTextboxControl.OldText" would be perfect! I imagine that it is stored in the viewstate and need to somehow get at it via a custom control.
View 2 RepliesPostback - .Net RadioButton Loses ViewState
Apr 13, 2010I'm having trouble with a simple radio set of two radio buttons (I don't want to use a RadioButtonList [RBL] because RBL doesn't allow child controls, and in my case, if you select one option, I want to enable a textbox next to the button; yes you could hack this with jQuery to move the textbox, but that's dirty!). I would check one, submit the form (either explicitly or through AutoPostBack), and the CheckedChanged event would never fire. When the page was reloaded, both buttons would be unchecked, regardless of their initial state on non-postback load or the state before form submission.
form id="form1" runat="server" enableviewstate="true">
<div>
<asp:RadioButton ID="foo" Text="foo" runat="server" AutoPostBack="true" OnCheckedChanged="rbChanged" Checked="true" GroupName="foobar" EnableViewState="true" />
<asp:RadioButton ID="bar" Text="bar" runat="server" AutoPostBack="true" GroupName="foobar"
OnCheckedChanged="rbChanged" Checked="false" EnableViewState="true" />
[code]...
Viewing The Size Of The Viewstate On Any Given Postback?
May 4, 2010Is there a reliable method for viewing the size of the viewstate on any given postback?
View 3 RepliesState Management :: ViewState Value Set After 2nd Postback?
May 3, 2010I am creating a simple string of values that get added to a label after a post back. I am setting the values thorugh ViewState. However, my appended values do not get updated until AFTER the 2nd postback. Example:
On Page_Load the label displays a "0";
If I enter a "1" in the text box and click the button the label still displays a "0";
If I click the button again (the 2nd postback) then my label correctly displays "0,1"; This works for whatever value I enter after. i.e. "0,1,35,hello world", etc.
What I am I missing? Code Below.
.ascx - I left out inherits and codebehind
[Code]....
C# - ViewState Is NULL In Page_Load But Not Postback?
Jun 4, 2010I've got a weird problem with a NullReferenceException on a high traffic website my company hosts. The exceptions are logged with full stack-traces but I am unable to reproduce it.The exception occurs a couple of times a day, for different users, and it's a NullReferenceException thrown in the code block below:
protected void Page_Load(object sender, EventArgs e)
{
...
if (!Page.IsPostBack)
{
...
this.ViewState[StaticClass.StaticStringProperty] = StaticClass.StaticIntProperty; // this is the line the exception occurs on
...
}
}
The only place I can figure that a NullReferenceException would be thrown is if ViewState is NULL, but I've never known that and can't find any reason why this would be the case in a Page_Load that isn't a postback.StaticStringProperty and StaticIntProperty are both initialised, static properties of StaticClass.
StaticStringProperty is defined as:
public const string StaticStringProperty = "IdFromClient";
Does anyone know how this could happen, or any other reason why a NullReferenceException would be thrown on the above line?
EDIT.As requested, the full stack-trace for the error is as follows. Line 54 is the line I've highlighted above.
at MyCompany.MyApplication.Appliance.Page_Load(Object sender, EventArgs e) in C:Documents and SettingsshellamaMy DocumentsMyApplicationAppliance.aspx.cs:line 54
at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)[code]....
Dataset Manually Put Into The Viewstate Of A Web UserControl Not Kept After Postback
Feb 2, 2010I've created a Web User Control that is placed on the page at design time. It's purpose is to pop up with a grid of items the user is to choose from. So I've got a gridview on it. And this code in the usercontrol:
Public Property DataTable() As Data.DataTable
Get
If Not IsNothing(ViewState("_SelectGridDataTable")) Then
Return ViewState("_SelectGridDataTable")
Else
Return Nothing
End If
End Get
Set(ByVal value As Data.DataTable)
ViewState("_SelectGridDataTable") = value
End Set
End Property
So when the user clicks on a button on the page, I put this in the code on the page:
SelectGrid2.DataTable = GetContacts().Tables(0)
SelectGrid2.Show()
And this works fine. The grid pops up (using jQuery) and the grid is shown. The problem is, that when the user clicks the "OK" button on the UserControl, the ViewState("_SelectGridDataTable") is always nothing. And I don't get it, since it's in the viewstate.. ?!? So does viewstate here not REALLY mean viewstate?
C# - Event To Save Data In ViewState Before Postback
Oct 14, 2010I am looking for an event firing before a DropdownList auto-postback to save Listbox items (populated with JS) in the ViewState.I tried the OnSelectedIndexChanged event but it's fired too late.
View 5 RepliesAJAX :: UpdatePanel Postback And Resulting ViewState?
Sep 10, 2010I'm reading about the UpdatePanel and how it interacts with controls inside & outside of it.
My understanding is that the usual ASP.Net pipeline takes place when posting from within an UpdatePanel-- Page load etc all fire off as normal-- except when the prerendering stage is reached. In that case the ScriptManager does a final check and only renders those controls within the UpdatePanel and skips the rest. That's my understanding at least.
Sounds good, but for argument's sake let's say I have a TextBox located outside an UpdatePanel. If a postback occurs from within that panel, the TextBox's properties can still be set in the page load method, but those changes will not take effect. (normally; it is possible to postback the entire page from an UpdatePanel)
Is that correct? What happens to that TextBox's ViewState in this instance? Is it updated based on what happened to it in the page load method or is that modification tossed out because it wasn't in the UpdatePanel?
Viewstate Lost On Postback For .net Sitecore Page?
Oct 27, 2010I'm getting some strange behaviour with viewstate being lost on postback for a .net application using Sitecore. I'm assuming it might be some config variable somewhere but I'm new to Sitecore and don't really know where to start looking.
UPDATE: Sitecore has now gotten back to us with an answer. We had recently added the dtSearch module, and AutomaticDataBind was set to true in the dtSearch.config which overrides the setting in the web config. We've now removed it and it works fine again.
I've made a mini test if that might help. It's two usercontrols on one page, both with a repeater. When updating the viewstate gets lost so even if I'm binding the updated repeater again the data for the other one will be lost.
Usercontrol 1:
<asp:Repeater runat="server" ID="Repeater1" OnItemDataBound="Repeater1_ItemBind">
<ItemTemplate>
<li>
<asp:Literal runat="server" ID="Literal1"></asp:Literal>[code]....
what might be going on? Let me know if I need to provide any more information. The most annoying thing is that it was working last week but I have no idea what has changed!
Web Forms :: Increase ViewState Size And PostBack
Mar 5, 2012The values are stored in viewstate fr the postback... Does everysubsequent post back increase the viewstate size?
View 1 RepliesPostback To Control's Parent - Validation Of Viewstate MAC Failed / How To Fix It
Mar 25, 2011I have a bit of javascript that presents a modal to the user with the rest of the page "grayed out." Pretty common these days. The modal allows you to specify a URL which then uses AJAX to serve and display. What I need is that when the control posts back, it posts back to the parent page, not the modal page. To attempt this, I used javascript to alter the target of the modal page's form element to the parent page's URL. When I try this I get the following error:
Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.
This is done locally and as of now, the app will never be on a cluster. I think this has to do with the validation process and .NET doesn't like that I've changed the target. Anyone know a way around this? I really need this to work how I described.
Textbox Control Don't Lose Value On Postback If Viewstate Is Disabled
Oct 23, 2010When we disabled the viewstate in gridview its lose value but this case not true with Textbox control why?
View 1 RepliesState Management :: How To Maintain ViewState On Postback Of Textboxes
Apr 19, 2010I have "n" <tables></tables> on my page and each <table> has One(1) <asp:CheckBox.. Enable ='true"/> and "x" <asp:TextBox Enabled="false"..>. Each Table looks as follows
[Code]....
When I click checkbox, it calls javascript function and enables textboxes (I have added onclick attribute to checkbox). Page also has <asp:Button ...Text="Submit"/> whcih actually grabs the data from the textboxes on the page and send it to the databse. Here is the Onclick event of the <asp"button../>
[Code]....
If the exception is thrown , textBoxes are not reset but on postback textboxes appear as disabled (values are not reset)
So here is what happening on postback when exception is thrown
1) Values are not reset (that is what want)
2) Texboxes appear as Disabled (that is what I don't want on exception, REMEMBER I enable textBoxes using client side script)
How can I keep the textboxes enabled = "true"
Postback - Store Object Class In Viewstate (or Other Ideas)
Sep 8, 2010I've build a class like this:
[code]....
The values of this class are set at postback by clicking a radiobutton list. Problem however is I don't know how to save this values across multiple postbacks. I thought of using viewstate but I'm not quite sure how to do it with this class.
Maybe I'm missing some important thing here.
Hope someone can point me in the right direction.
State Management :: ViewState Returning Null On Postback?
Apr 18, 2010Im currently experincing some difficulties with the viewState. The scenario is that i have a datagrid that has a column of buttons that when pressed will store a value in the viewState. I have already done this on one occasion in the same page, but for some reason the second item in the view state is always returning null, even when i hardcode in a number in before the postback. Im at a loss as to why this is happening, anyone expericened this and know what is wrong.
EDIT: Ive found out the cause, Its due to when you click a button in a data grid it does the postback code first, then fires the event handler, so of course the view state would be empty as it is coded to be set in the event handler for the button click. Is there any way to avoid that? So the event code is fired before the postback code?