Web Forms :: Unable To Use PreviousPage?

Feb 4, 2011

Somehow my textbox is returning a null.

I have a MasterPage, I have an Edit.aspx page and an Edit.ascx control.

VirtualPath="~/forms/InclusionRule.aspx" %>


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Web Forms :: Cannot Get The Property In PreviousPage

Aug 3, 2010

i have a problem with a previouspage and getting the value of selecteditem in gridview

here i have my code as you can see i have in my Users.aspx page: 1) a property readOnly UserID 2)an event Grw_utenti_SelectedIndexChanged who transtfer to UsersDetail.aspx


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Web Forms :: Get The Value Of A Textbox Using PreviousPage Method Along With A MasterPage?

Aug 20, 2010

I'm trying to get the value of a textbox using the PreviousPage method and the previous page utilizes a MasterPage for the page's layout. I've read through many forums laying out the ground work on how to do this, but for whatever reason I am just being unsucessfull in getting this to work in my project.

Mark-up of previous page using a master page template:


VB Code-behind page for second page:


What really confuses me is that when I step through the code it goes all the way through the if statement but never gets the text value from the previous page.

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Web Forms :: Breadcrumb's Link Behave Like PostbackUrl To Get PreviousPage Data?

Jan 6, 2011

Bydefault breadcrumbs links are behaving like Navigate Url.Due to this we can not get Previous page data.But can we make that link to behave similar to Postback url, like LinkButton has property PostbackUrl , with the help of this we can get Previous Page data.

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Web Forms :: Opening The Aspx In New Window While Retaining PreviousPage.FindControl Method?

Jul 20, 2010

I want to open a aspx page in new window.

I am openning a web page using JavaScript open .

StringBuilder cstext3 = new StringBuilder();
cstext3.Append("<script type=text/javascript> function OpenPreviewPage() {");
cstext3.Append("} </script>");

And executing following at button click on .cs page

protected void btnPreview_Click(object sender, ImageClickEventArgs e)
/*This will call the OpenPreviewPage method of java script from .cs file */
string javaScript =
"<script language=JavaScript>
" +
" +
RegisterStartupScript("ShowPreviewPage", javaScript);

The problem is the PreviousPage tag in preview page is null.

repPFareDetail = PreviousPage.FindControl("repFareDetail") as Repeater;

Is there any other way to open the aspx in new window by retaining the PreviousPage.FindControl method.

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C# - NullReferenceException On PreviousPage Property?

Jan 11, 2011

I followed the directions from MSDN on transferring data between asp.net pages.But when using the 'PreviousPage' property to access the previous pages controls, I get a null ref exception that PreviousPage is not set to an instance of an object.Here is my code:

public partial class Portal : System.Web.UI.Page
public string Username


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Retaining PreviousPage Information After Postback?

Jul 29, 2010

I'm using the asp.net PreviousPage functionality and cross-page postback. The problem i'm running into is that if I have any postbacks on my page, the PreviousPage information seems to be lost. I don't want to put it in ViewState because that will be quite large. I've thought about Session, but I don't want the data to persist after i've moved on to another page, and I really don't like the idea of putting code in all my other pages to delete old session variables.

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PreviousPage Is Equal To Null In Crosspage Posting?

Feb 7, 2011

I'm trying to pass post data from one page to the next but PreviousPage always equals null.This is what I have in the original page (inside an updatepanel

<asp:Button ID="mmGo" runat="server" Text="Merge" PostBackUrl="~/Default2.aspx?action=merge"/>
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>
<%@ PreviousPageType VirtualPath="~/Default.aspx" %>

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State Management :: Cannot Retrieve Previouspage Data On Postback

Oct 28, 2010

I have a webform will perform a server.transfer to another webform. Upon postback on the second webform, i am not able to retrieve the previouspage data. is there anyway i can achieve this?

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Web Forms :: PreviousPage.Master.FindControl("ContentPlaceHolder1") Is Null?

Jan 19, 2010

I have a masterpage with three ContentPlaceHolder and a page derive from it.

Let's call the page derive from it as "PageFrom", the "PageFrom" has a GridView.

Each row in the GridView has a linkbutton which do a cross page postback to another page, "PageTo"

And I am trying to grab any control in the "PageFrom"

I have tried PreviousPage.FindControl() and PreviousPage.Master.FindControl(), none of them works.

The master page code


The PageFrom


The "PageTo" code-behind


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Easiest Method To Build Where Clause From Checked Items In DataList Of PreviousPage

Jun 25, 2010

I have a selection list that is generated dynamically, it lists a number of checkboxes that are based on an end-user editable table, as such I have no idea what data, or how much, might be contained in this table and how many checkboxes or what they might contain, other than the primary keys of the table. The user will select the checks they wish to see, and then control is passed to another page via PostBackUrl. The second page has to figure out which records to show (build it's where clause) based on the checkboxes checked in the previous page.

So, my problem is several-fold. First, asp:CheckBoxes don't have values. This can be worked around by a number of methods. Right now, i'm using a placeholder and dynamically creating the checkboxes in the ItemDataBound event of the DataList. I set the ID to "CheckboxKey1Key2" (where Key1 and Key2 are the primary keys of the check items). Second, I have to walk through the controls of the PreviousPage to dig out all these values. That in itself is also a pain, but doable. Now, my thinking is to build the where clause of my Linq2Sql query based on the keys I got from decoding the checked checkbox names. This all seems like a lot of jumping through hoops for something that shouldn't be this difficult. Am I missing something? Does anyone have any better solutions?

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State Management :: Access PreviousPage On Button Click Handler Of Target Page

Oct 12, 2010

I Have two pages source.aspx and target.aspx. Source.aspx has one button and other form controls the collect input. The button has its postbackurl property set to target.aspx. On target.aspx I have another button and other form controls that collect input. When the user clicks on the target.aspx button, I want the inputs from both source and target gathered to be inserted into the database. The problem is the Page.PreviousPage property is only available during the initial rendering of the target.aspx page. So when I click on target.aspx button, PreviousPage is now null.

One strategy of mine is to collect the information on page_load and store it in ViewState, but is there any other method that I should consider in this process. I think the cleanest approach would be to somehow access PreviousPage on the button_click event handler, but how can I access this property.

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Cross Page Posting Via HttpRequest || Page.PreviousPage?

Mar 26, 2011

I've been developing classic ASP pages at the job for the past five years and now we are moving to ASP.NET. I'm trying to understand how to get form field values from one page to another and it seems like there is more than one way to do it. In classic ASPI just called request.form collection and got the information. Which way is recommended in .net? Cross Page, Transfer, or HttpRequest?

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How To Get String Value With "PreviousPage.FindControl" / Fetch Value Store In String Variable On Next Page

Jun 18, 2010

I have a value in string i want to use that value on next page.

How can i access it with previous page property?

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Unable To Connect IBM MQ Via - Unable To Load DLL 'amqxcs2.dll'

Feb 18, 2011

I am trying to check the connection with one of active IBM MQ's but I am getting this error.. Unable to load DLL 'amqxcs2.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)

I am using the following code..

Included amqmdnet.dll and amqmdxcs.dll in bin and gave the same reference to the project.

using IBM.WMQ;
using IBM.WMQ.PCF;

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Unable Run Application Getting Error "unable To Connect Development Server"

Jan 25, 2011

I am using an Visual studio 2010 ultimate edition. And here i have getting an error " unable to connect to the asp.net development server " while i try to run the Web Application by pressing F5 key from Web Application Project. Can any tell me whats the problem and how can i resolve it.

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Web Forms :: Unable To Get Data From SQL?

Jan 4, 2010

I've come into a company and we're redoing a very, very poorly designed website. I'm bringing it up to speed using asp.net built in membership and roles and all. Well I've got everything working flawlessly for anyone who signs up for the system now.

My problems is all the older users. The passwords for the old users are encrypted in the database so I can't just copy profiles over on the SQL side of things. I was thinking my best plan would be use the create user wizard in asp.net so it could take all their information and create an account on the new system.

My planned solution is direct the old users to a page where their UserID is confirmed and all the information pulled from the old database into the create user form. At which point they enter a new password, along with two other pieces of information that are new to the new site then submit and the system makes them a new account...

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I removed some of the addition behind code to keep this reasonably short.

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I have one dropdownlist like this:


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I want to get the value of the textbox on code behind. The textbox value is changed by using some javascript stuff. For disabling enter text into the textbox i use Readonly=true or another is Enabled=false. The javascript change the value properly. suppose the javascript set the texbox content is 123. When submit the button i am unale to get the value.

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I made sure and added an entry into the DB for login, but I try it comes back as:

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Jan 9, 2010

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Apr 23, 2010

I have a tab which loads a usercontrol dynamically and this usercontrol has 2 other usercontrols. One on the left loading treeviewA and one on the right treeviewB.I am using update panel for aspx and the ascx too. But, I am not able to control to page state and moreover when I click on one control, it get its child item, by the time I click on other control, it would refresh other control too and will lose its value.I am using below code in aspx and I have embeded update panels in usercontrols too

using http://msmvps.com/blogs/luisabreu/archive/2006/11/16/adding-removing-updatepanels-dynamicaly-from-a-page.aspx
as reference



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Web Forms :: Unable To Add List Obj Into Arraylist

Feb 12, 2010

I am trying to retrieve a arraylist frm a session and add in more objects into the arraylist on top of the existing object in the arraylist.But i have encounter problem at the foreach loop where it promted me a error message shown below

Object reference not set to an instance of an object.

below are the sample code.

public void addItemToArraylist(List<LibraryItem> temp) //l temp pass in 5 items each tim
ArrayList storeItems = new ArrayList();
storeItems = (ArrayList)Session["storeItems"];
foreach (LibraryItem items in temp)


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Jun 10, 2010

I am facing a problem in converting RTF files into HTML form. The library converts the RTF form but the formatting disturb because there is much difference between RTF document formatting and HTML form formatting. e.g if the size of the text on RTF file is 12 and the 12 of HTML form is different than RTF.

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I can't open "ONE" page of .pdf file using IE8 and give me an error message "the file is damaged and could not be repaired" when retrieved from SQL Server 2008, but more than one page I can open with no problem.

With Chrome I can open any number of .pdf pages.

The same page that I can't open using IE8 from DB, can be opened directly from hard disk using IE8.

My code in .asxh file:


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