Web Forms :: Error While Reading Values On Postback
Sep 3, 2010
I have some problems with trying to read values on a postback. The fields, textboxes and dynamiclly created fields doesn't keep their values or I'm doing something wrong when trying to read the values. I get an error message:
System.NullReferenceException was unhandled by user code
Message="Object reference not set to an instance of an object."
Source="App_Web_m-6qot6q"
StackTrace:
at Sikt.RäknaVärden() in C:Visual Studio 2005WebSitesKalibreringscertificatSikt.aspx.vb:line 688
at Sikt.Button1_Click(Object sender, EventArgs e) in C:Visual Studio 2005WebSitesKalibreringscertificatSikt.aspx.vb:line 892
at System.Web.UI.WebControls.Button.OnClick(EventArgs e)
at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)
at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
Also, I get some other errors, such as "Name 'DropDownList1' is not declared" and "Name 'Label1' is not declared" I'm used to classic ASP and this is my first .net 2.0 (vb) application. I'm including some of the code (should be all relevant code)
I want to display panels based on the check boxes selected on the dynamic checkbox list control. I have been able to dynamically build the check box but have no idea on how to access its checked propety. This is what I am doing but getting error on Request.Form On page load wrote this code.
protected void Page_Load(object sender, EventArgs e) { int i; int chkboxCount = Request.Form("chklist1").Count; for ( i = 1; i < chkboxCount) { String valueChkbox = Request.Form["chklist1"]; } }
What i am trying to do is read the value from the search textbox from the nextpage.aspx. When i hardwire a text value to the txtboxsearch, i can read it using the page.previouspage property in the code-behind of nextpage.aspx. But when leave it empty so it will dynamically extract whatever value that's typed there, it doesn't read it. I am sort of understand why it is failing but can't fix it. I have gone through: [URL]
I am using Adobe Captivate 5, and ime trying to create an ASP script which will store the results from a quiz in an SQL database. The problem I am having is that captivate is posting the results from the quiz in multipart/form-data format and I am unable to retrieve the variables in my ASP script.
I have tried request.form("test") and fileUpload("test") and neither retreives the varibales.
What is the syntax to retrieve data that has been posted in the multipart/form-data format???
How can we split values from one column? I have a column in table like "work Experience". "02/03" Month and Year. I want to split that values and display in saperate labels. after clicking edit button they are displayed on dropdown list. Similarly i want to do for Annual CTC column.The Split for annual CTC will be Total Sal in Lakhs and In Thousand. Just want to write split function for that.How can i write and display?
I came across old web application which has the code to read the parameters from the URL of the site. The code is full of string processing. http://hostname.domain[port number]/application name?arg1=value1...&argN=valueN onsidering that URL parameters are always encoded it is litter difficult to rely on string processing. Also not sure if one can rely 100% on the URLEncode/Decode functions of the JavaScript.
function getURLParameters(){ if (location.search != "") var x = location.search.substr(1).split(";") for (var i=0; i<x.length; i++) var y = x[i].split("=");
I am trying to get the value of a timer using the HtmlAgilityPack however when I get the innerText by the element ID it returns --:--:--Is there any way to get the time value since it uses AJAX?
sorry for the naive question, but it looks it should work and it does not. Say I have this simple scenario: a controller with its view with a single action, Index. The view has a form with a dropdown with some letters and submit button. When the form is submitted (to the same Index action of the same controller) the controller should fetch from a repository all the persons whose last name begins with the selected letter and pass it back to the view. So my controller is like this (I'm using the MVC Contrib data grid):
[Code]....
The view form (a strongly typed view whose model is an IEnumerable of Person EF objects) looks like this:
[Code]....
This works the 1st time I submit the form, but whenever I click the next/previous button of the pager the Index action is invoked but I cannot read the dropdown selection: I tried with Request.Form and with a different signature in the action (by adding it a string LastName parameter), but I always get NULL instead of the selected value, so that the query returns no persons. What I'm doing wrong? How can I read the dropdown value across posts to the same action?
I have a Webcontrol, that I create completely dynamically and it contains radiobuttonList. How can I acces this radibuttonlist values, on pages where I register this control?
public class MyControl: WebControl pnContainer = new Panel(); rbl = new RadioButtonList(); liResume = new ListItem("Resume", "Resume"); liReopen = new ListItem("ReOpen", "ReOpen"); rbl.Items.Add(liResume); rbl.Items.Add(liReopen); pnContainer.Controls.Add(lblReOpenTitle); pnContainer.Controls.Add(rbl); this.Controls.Add(pnContainer);
I'm trying to store multiple selected checkboxes from a single checkboxlist, but i don't know where to start. Imagine i have three tables: tbl_events, tbl_organisors and tbl_settings and i want to store the organisors of an event. Each event can have multiple organisors, so each organisor should be added as a single row into tbl_settings. I know how to bind tbl_organisors to a checkboxlist, but how do i store the results (meaning: add the rows to tbl_settings) ?
tbl_events: Event_ID (PK) and Event_Name tbl_organisors: User_ID and user_name. tbl_settings: Settings_ID (PK), Event_ID and User_ID
Checkboxlist:
[Code]....
SQLDatasource:
[Code]....
Initially all checkboxes will be unchecked, but users must be able to select multiple organisors from the checkboxlist and then store them into the DB by submitting a form. So the query will look something like: INSERT INTO tbl_settings (user_id, event_id) VALUES (@user_id, @event_id). And this is where my head cracks
1) How do i loop through all selected checkboxes and store each value (user_id) in a new row in tbl_settings? 2) After saving, the users reloads the page and the organisors he just selected must be selected by default in the checkboxlist. How?
I am trying to pick data from the database through data access layer and use those values in different text boxes on the page.Basically on a click on the form, modal popup is planned to read the database and put the values into different text boxes which can be latter changed/ updated.
What I am unable to do is accessing those values on the form itself progamatically.
My data access component is as follows:
[Code]....
How do i read these values individually and put them in different boxes!? What I dont want to do is to access these from page's .cs file.
I am writing C# code to read a sheet from a workbook. A couple of cells in the sheet are of Date type. However, when I check out the xml generated for the sheet, it contains numbers, for e.g. 38018 instead of 1 Feb 2005. As a result my code ends up treating this as number and I am not able to recreate a date object.
I am facing a problem where when a user logins for the first time it shows the following error: The resource cannot be found. Description:HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly.
i have a Method which create textboxes dynamicly. When i change one of my textbox's text, it create that amount textbox and label. But my problem is, when i entered values to them and click my button, they are disappearing and i cant find my controls. Some of my codes
One of my NUnit tests has to read in some values from config files. In my main application this process works perfectly well, however when I run the unit test, the code that reads in the values from the config files doesnt read anything in. Ive tried putting app.config in my unit test project (I even tried web.config) but nothing seems to work. Are there any special steps involved when reading from config files in an nunit test ?
I'm seeing some weird behavior within MVC 2 in regard to reading cookies. I write a cookie and specify a path. I intermittently see a null value returned for this cookie within my MVC application. I've verified throug Firebug that the browser is sending along the cookie in the request headers. When debugging, I can see the cookie in the headers (i.e.) Request.Headers["cookies"] but when trying to access the cookies collection, it's null (Request.Cookies["mykey"].
I'm using the AsyncController. Since this the issue is intermitent, is it possible there is a race condition?
How Can I retrieve values from TextBox before RowUpdating function is fired? I have GridView with update panel which is sorted by two dropdownlists and I need autopostabacks to filter and bind gridview. Now I want to update row in my gridview but I can't get values from controls I'm getting old values from database. Do you the way that I can use values from controls before updating the row?
I created a ASP.Net page with dynamic controls. These controls are added by the user. In the Page_Load event a table is created with few controls.
When these dynamic controls do a postback, I can't get the values of these controls, because in my HTML code they are not available.
I only get the id of the control which triggers the postback. But I can't find it with the command FindControl. All other controls, which a are not added dynamicly are searchable.
I just uploaded an asp.net webforms site I've been working on to my ISP's servers. I have a simple page that allows users to enter schedule data. The problem is that when the user clicks the Add button and I try to process the values they've entered in the textboxes and dropdownlist in the click event handler, all the values are blank. For example, there's a DropDownList called uxStartTime on the page and after postback uxStartTime.SelectedValue is blank. However, the Response.Form[uxStartTime.UniqueID] has the proper value. I have EnableViewState="true" in the aspx page. This all works fine on my local machine, just not on the server. Can anyone tell me what's going on? I can use the Respons.Form syntax, but it's a little more verbose and prone to typos.
