.NET Tutorials, Forums, Interview Questions And Answers
Welcome :Guest
Sign In
Win Surprise Gifts!!!

Top 5 Contributors of the Month
david stephan
Gaurav Pal
Post New Web Links

How to Make a custom property or a page persist across postback

Posted By:      Posted Date: September 29, 2010    Points: 0   Category :ASP.Net


As the title suggests, 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?



View Complete Post

More Related Resource Links

Creating custom property on derived Page

I am attempting to accomplish the following during the creation of a Page derived from DerivedPage: <local:DerivedPage xmlns="..." xmlns:x="..." xmlns:local="..." MyProperty="My Value" Title="My Title"> ... </local:DerivedPage> You'll notice an extra property MyProperty in there. The code-behind is like this: class DerivedPage : Page { public string MyProperty { get; set; } ... } When I execute this, I get a null reference in InitializeComponent() when I create a Page derived from DerivedPage. I also tried making MyProperty a dependency property.  But I get the same results. How can I create a property for my new base-class that's set in the markup of my derived class. Thanks, ...Matt

not able to set custom property of web part on page load


I am not able to set the custom property of the web part on page load.

It gives me exception if i try to get or set that property but i can still access other inbuilt property of the web part and can display them on the page.


I am using sharepoint designer and MOSS 2007.

how to persist a class object when page PostBack


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,
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?

To keep the object persist, i have used ViewState

So i have made MyClass Serializable and
i have used ViewState to keep my objet persist, but it give the error
like : UserControl is not marked as serializable.

so i have made my UserControl as Serializable, but the problem is still coming.

One more thing is that MyClass is also resposnsible to create some other class object also.

Can any one suggest me correct solution?

Problem i am getting when i try to PersisObject On UserControl

[SerializationException: Type 'ASP.common_grid_UserControl_ascx' in Assembly 'App_Web_44142fbl, Version=, Culture=neutral, PublicKeyToken=null' is not marked as serializable.] System.Runtime.Serialization.FormatterServices.InternalGetSeri

Custom control's children do not persist contents after postback


I 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 please 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?

Crude diagram

Here is the code for the control

Imports System
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Text
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls

<ToolboxData("<{0}:MyTestControl runat=server></{0}:MyTestControl>"), ParseChildren(True)> _
Public Class MyTestControl
	Inherits CompositeControl
	Implements INamingContainer

	<NotifyParentProperty(True), PersistenceMode(PersistenceMode.InnerProperty)> _
	Public Property Panels() As List(Of Panel)
			Dim s As Object = ViewState("_StaticPanels")
			If s Is Nothing Then
				s = New List(Of Panel)
			End If
			Return CType(s, List(Of Panel))
		End Get
		Set(ByVal value As List(Of Panel))
			ViewState("_StaticPanels") = value
		End Set
	End Property


Web Part Custom Property Text Values Showing Up on Page


I've created a basic Web Part in a .wsp and defined two custom web properties.

However, whatever value I place in these text values when in the edit mode show up on the Page beneath the Web Part name.  Why?  How do I not show the value of Properties outside of the Modify Property window?

Custom Server Control Property not maintaining state


I have created a server control consisting of a TextArea and a div under it.  My goal is to create my own asp:TextArea type control.  the div is for a Character count of the text area and seems to work ok but i added a CharacterCountVisible property to the control that is always returning true.  See Proptery definition below


<Bindable(False), Category("Appearance"), DefaultValue("True"), Localizable(True)> Property CharacterCountVisible() As Boolean
        Return _CountBoxVisible
    End Get
    Set(ByVal value As Boolean)
        _CountBoxVisible = value
    End Set
End Property

Note the _CountBoxVisible variable is define inside the class as :

Dim _CountBoxVisible as Boolean = True

What I am trying to do is give the user/coder the option to show/utilize the char count feature.  Can make it disappear with textarea1.CharacterCountVisible = False but setting it to true will not make it display.


What am i missing





How do I persist custom complex types in design-time


Let's say that I've got one custom webcontrol called MyControl.

public partial class MyControl: WebControl {
public IComplex Complex { get; set; }

The control is a very simple control but it holds an instance of a complex type that is accessable through a property. The property has the propertytype IComplex

public interface IComplex {
string Name { get; set; }
List<IComplex> Children {get;}

Let's say that I am able to pick one of several different types of object that derives from IComplex in design-time and assign it to the controls property "Complex" property.

Naturally I would like to persist this information to the HTML-View in a user-friendly way.

Because we don't know what type the user has picked there is no way to instansiate the type if we don't persist the name of that type. The Type could also contain more properties than the Interface the controls property is refering.

<cc1:MyControl id="MyControl1" runat="server">
<Complex> <!-

page postback problem with crystal report


Hi , i am creating crystal report with asp.net it is working showing data but  data is of two page its is take round trip action but report is not show 
until again i click on show button in this it is not propersly showing that data is how.

<br />
    <asp:Button ID="btnShow" runat="server" OnClick="btnShow_Click" Text="Show Report" />
<CR:CrystalReportViewer ID="CrystalReportViewer1" runat="server" AutoDataBind="true" DisplayGroupTree="False" EnableDatabaseLogonPrompt="False" /> CrystalReportViewer1.ReportSource = null; SqlCommand cmd = new SqlCommand(strcmd, c.con); SqlDataAdapter da = new SqlDataAdapter(cmd); DataSet ds = new DataSet(); da.Fill(ds); ReportDocument doc = new ReportDocument(); doc.Load(AppDomain.CurrentDomain.BaseDirectory + "\\rptQuotation.rpt"); doc.SetDataSource(ds.Tables[0]); // login info SqlConnectionStringBuilder csb = new SqlConnectionStringBuilder(ConfigurationManager.ConnectionStrings["conStr"].ConnectionString); TableLogOnInfos crtableLogoninfos = new TableLogOnInfos(); TableLogOnInfo crtableLogoninfo = new Tabl

Remeber page postion on postback



I dont know if this is possible or not...

I want the page when refreshed to remember the position that the user was at on the page, for instance if they are scrolled half way down the page when the page posts back can it return to that position on the page?



Change part of a page without full postback


I have a page with two columns. Initially, the left column will contain a list of links that are article titles. Clicking on one of the links will display the text of the article in the right column, keeping the list of titles in the left column. Clicking on another title will clear the text of the first article and display the second. Is there a way to accomplish this without having to repaint the whole page? I would rather not have the whole page resent each time a title is clicked, but rather have the page stay as is and only the contents of the right column get cleared and redisplayed. I assume there's a way to do this with JavaScript, but I don't know how and would appreciate some help. Thanks!

Unable to search Custom User Property Created in User Profiles in SharePoint 2010


Hi ,

I have created a custom user property,and created metadata property and added mapping to it, still i m not able to Search in People,Please advise

Apply custom.master to "Site Settings" page?


I'm using a custom.master page, which is applied to almost all pages available to READ users.

However, I'd like to apply it to the Search, Site Settings, and View All Site Content pages.

I'm not sure where this would be applied.

Guidance much appreciated. Thanks!

Sharepoint 2007 - Wiki site - New Pages Not Inheriting Custom Master Page


I am working on a SP site (MOSS not WSS) which is heavily customised away from the OOTB layout. I need to create a Wiki site, which was going well - I've created a master page which displays the miniconsole (this was not visible with our customised layout), and made it the default master page for the site. This has been applied to the two standard pages that come with the Wiki site, however when a new page is created, it seems to inherit the default.master, rather than my custom master page - thus not showing the miniconsole.

When I have created a new page, I am able to use SharePoint Designer to attach my custom master page to it, which works perfectly, however this will not be a viable option going forward as end-users create their new wiki pages.

How can I get the new pages to inherit my master page when they are created?


Adding a custom ASP page to a sharepoint 3.0 site


I have a custom ASP page that I need to add to my sharepoint 3.0 web site.  I created a virtual directory under my website and placed the ASP file.  When I link to the ASP file, I get a 404 page not found.  To make sure I had the correct URL path, I created a test html file and placed in the same virtual directory and linked to it just fine.  I think it has something to do with managed paths and sharepoint trying to control this new ASP content.  I cannot figure out how to exclude this content from managed paths.

Any suggestions on how to resolve this issue so I can run this custom ASP file under sharepoint 3.0?


QueryEx (Search) results and Custom Page Index


Hi All,

I done a web part which allow the user to query the search.asmx. It return the result fine against which I apply some xslt. However I need a mean to create a Page index. I only return the result based on a range defined in the query.

I need somehow to obtain the number of result the search is returning in total against what I only want to display on the screen.

The only way I sort of figure to do that is by first make a search just to obtain the number of result it will return in total and then make a search defining a range.

Has someone done something similar?


How to make browser scroll to the bottom of page


Hi All,

  How to use asp.net C# to scroll to the bottom on page on post back or programmatically decision? 

QueryEX results and Custom Page index


Hi All,

I done a web part which allow the user to query the search.asmx. It return the result fine against which I apply some xslt. However I need a mean to create a Page index. I only return the result based on a range defined in the query.

I need somehow to obtain the number of result the search is returning in total against what I only want to display on the screen.

The only way I sort of figure to do that is by first make a search just to obtain the number of result it will return in total and then make a search defining a range.

Has someone done something similar?


ASP.NetWindows Application  .NET Framework  C#  VB.Net  ADO.Net  
Sql Server  SharePoint  Silverlight  Others  All   

Hall of Fame    Twitter   Terms of Service    Privacy Policy    Contact Us    Archives   Tell A Friend