Web Forms :: User Controls Are Null When Referenced Inside The Code Behind For The User Control?
Sep 1, 2010
I have an ASP.NET 4.0 application with some simple user controls. The user controls work fine on the design surface (VS.NET 2010), but when they're loaded during application execution, nothing shows up.
Futhermore, the various child controls of the user controls are null when referenced inside the code behind for the user control.
The code behind for the user control executes as expected, but any reference to child controls are null.
It's like ASP.NET is never parsing the ASCX to create the instances of the child controls.
View 4 Replies
Similar Messages:
Jun 11, 2010
I have to access the parent form's controls inside an event handler method on my user control's code behind.
View 4 Replies
Jun 4, 2010
I don't think I understand fully how ASP.NET does inheritance of controls.I have a user control, ucBase, which has an asp.net label in the ascx file. Code behind references the label and it works fine during run time if the control is not a parent for another user parent.
If I have another user control, ucChild, inheriting from ucBase, the label in ucBase's code is always null. ucChild has no controls in its ascx fileThe server controls (like the label) needs to be declared in the ascx file and not created programmatically.What needs to be done for ucBase to see its own controls when it's a parent user control?
View 1 Replies
Mar 10, 2011
I have a web user control that represents a simple message box. It is used to display simple messages like "Item has been deleted", or "The item was saved successfully".
On the other hand, I have another web user control that represents the item in the form of an editable form (I made this a user control because this is used in two different pages). I want to embed an instance of the message box user control inside the editable form. I am writing this right after the @Control directive:
[Code]....
Instead of using @Register directives, I register the user controls in web.config and so far this has worked just fine.
With the above markup, the project compiles, but whenever I try to navigate to a page that contains this construct, I get an HttpParseException exception. Furthermore, Visual Studio states that the tack w7rc9:MessageBox doesn't represent a known control.
What am I doing wrong?
View 2 Replies
Feb 25, 2011
I have DefaultPage with MasterPage, two web user controls A.ascx and B.ascx. A.ascx is nesting B.ascx
I created folder App_LocalResources and added there two files: B.ascx.resx and B.ascx.xx-XX.resx.
Each resoource file has lblText.Text item.
B.ascx has a label:
[Code]....
I'm trying to use this [URL] methods to localize web user controls, but it doesn't work. Is there some trick for web user controls?
View 1 Replies
Apr 16, 2012
I hava a page default.aspx having master page abc.aspx and web user control login.ascx i want to call perform simple alert function on login button but not on client click event. For e.g
Protected Sub BtnMyIpLogin_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnMyIpLig.Click
'Some Validation part here for user login
'then my if condition like
If flag_alert = 0 Then Page.ClientScript.RegisterStartupScript(Me.GetType(), "btnflag", "alert('Your Download / View Limit Exceed More Than 90%');", True) End If
but it is not working.........................
View 1 Replies
Apr 16, 2010
All I would like to be able to do is include one user control within another! Is this possible? I have spent the last hour searching the internet and it seems that I can't find a single thing.
In classic ASP it would be something like:
<!--#include file="EditProject.ascx"-->
I tried this but no luck!
Parser Error Message:
There can be only one 'control' directive.
Source Error:
[Code]....
Line 1: <%@ Control Language="VB" AutoEventWireup="false" CodeFile="EditProject.ascx.vb"Line 2: Inherits="Controls_WebUserControl" %>Line 3: <form runat="server">
View 3 Replies
Sep 24, 2010
i have a user control that has a few inner controls like lables and images that represents a "movie".
from a web page i get a list of movies (List<Movie>) and for each movie in the list i want to generate my user control and add it to a panel.
(i added a movie type data member to the user control)
code (1):
List<Movie> movies = movieRepo.GetAllMovies();
View 4 Replies
Nov 10, 2010
I have a ObjectDataSource and a ListView referencing it.
I have created a Templated User Control (see:
http://msdn.microsoft.com/en-us/library/36574bf6.aspx) and placed it in the ListView's InsertItemTemplate
It has one template <ContentTemplate>. Inside that template, I've defined a couple of server controls with their properties = '<%# Bind("colName") #>'.
See below:
[Code]......
View 8 Replies
Feb 8, 2011
I'm working on a user control that renders couple nested divs (a rounded corner box to be frank). This is a templated user control, which means that user can put any control he wants into the header, body or footer of this box. Everything is working fine, except the fact that server-side controls can't be retrived from my box. Take a look at this code:
[Code]....
Now codebehind of that control:
[Code]....
I have cut out all the unimportant stuff.Now when I use this control:
[Code]....
I want to access controls in page codebehind file (on Page Load): LiteralNewses.Text="";
but compiler returns an error that LiteralNewses doesn't exist. Also FindControl method can't find this literal.Any tips on what's wrong with this code? According to MSDN, setting TemplateInstance to Single ensures that controls from template will be accessible but not in my case...
View 1 Replies
Feb 11, 2010
I'm loading a user control programatically like this:
[code].....
The problem I have is that all the controls in my user controls are null, is there something else I have to do to load the child controls?
View 1 Replies
Mar 1, 2010
i have a base user control (WC1) which inherits from WebUserControl and a child user control (WC2) which inherits from WC1. I added a textBox and a label to WC1 in vs design view not code behind. But all the server controls that i put in WC1 are null and give null pointer exception.I tried to access textBox and label in different events but the all of them are null.
Steps to reproduce the error:
create a web user control called WC1 by add a new item in VS added a textBox and label server control to WC1 in design view of VS and put code behind: var value = txetBox.Text; created another web user control called WC2 by add a new item in VS and change its base class to WC1 in its code behind create a web page by adding a new item in vs and drag WC2 to the design view of the page run the page then you will see the exception for the codebehind in WC1
[code]....
page:
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="WC2.ascx.cs" Inherits="WebApplication1.WC2" %>
can web server controls of WC1 be instantiated in this case? or can user control inherit from another user control and web server controls of parent user control be carried to its children without worring the layout?
View 1 Replies
Apr 16, 2010
I have a user control inside a repeater. I am binding a collection of objects to the repeater.
My user control has a public property to retrieve the object (setobject)
How do i pass each object through to the user control and not just the object property value? What is the syntax to do this?
[code]....
View 1 Replies
Jun 4, 2010
I have a user control called ucTriStateButton. It raises an event when it is clicked, called TriStateButtonClicked. If I put this user control on a page, it works fine. Here is the declaration on the .aspx page:
[Code]....
When the button is clicked the method tsbTest_TriStateButtonClicked executes correctly.
The problem is when I put the user control in template field of a GridView.
[Code]....
There is no way to hook the event handler to the control in Page_Load because I cannot get a reference to tsbMorning. So I did it in the RowDataBound event handler of the GridView, where I also do a bunch of other row-specific stuff. Although this builds and runs, the event is never actually subscribed to and so never gets fired.
So the question is - how can I handle an event from many instances of the same user control within a GridView? I am calling the same bit of code regardless of which user control is actually clicked. I only need to know that one was clicked.
View 3 Replies
Feb 26, 2011
Is it possible to use ajax controls (as it is) inside a user control?
View 2 Replies
Oct 19, 2010
I am stuck into a problem, i have a user control ProductListing.ascx that contains ListView binded to an object datasource, SelectMethod and SelectCountmethod are provided as well. Everything works fine but the problem started when i add another user control declarativlly Filter.ascx in the productListing.ascx. I want to assign value to a public property MaxPrice in Filter.ascx. I am trying to set this property in the SelectMethod of ObjectDataSource. Usercontrol "Filter.ascx" throws null reference exception when i try to set its MaxPrice Property.
I tried to acced the usercontrol in Databind method of ListView , it is accessible here but viewstate is empty at this point, i saved the value in viewstate in SelectMethod of objectDatasource but i cant access viewstate in ListView Databind. Its empty. Its a simple code and no rewriting to viewstate elsewhere.
Important: My Codebehind files are in a seperate project and .ascx files in seperate project
View 1 Replies
Jan 16, 2010
I downloaded a sample Rolodex from here: [URL] the file to download is at the bottom of the page and it is called 'RolodexDatalist.zip (6.71 kb)' So I changed the HTML to it points to my SQL Server DB. I changed the ConnectionString to this:
<connectionStrings>
<add name="CustomersConnectionString" connectionString="Data Source=EXCEL-4J2W8KYNPSQLEXPRESS;Initial Catalog=Customers;Integrated Security=True"
providerName="System.Data.SqlClient" />
</connectionStrings>
Now, everything points to my DB! I thought, ok great, this should be pretty easy. However, when I debug, I get this error message: 'Null reference was unhandled by user code. Object reference not set to instance of an object. Troubleshooting Tips: use the "new" keyword to set an instance of an object.' This line is yellow:
Dim conStr As String = ConfigurationManager _
.ConnectionStrings("conStr").ConnectionString
Here is the code-behind:
Imports System.Data
Imports System.Data.SqlClient
Imports System.Collections.Generic
Partial Class VB
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
If Not IsPostBack Then
ViewState("CurrentAlphabet") = "ALL"
Me.GenerateAlphabets()
Me.BindDataList()
End If
End Sub
Private Sub BindDataList()
Dim conStr As String = ConfigurationManager _
.ConnectionStrings("conStr").ConnectionString
Dim con As New SqlConnection(conStr)
Dim cmd As New SqlCommand("spx_GetContacts")
cmd.Connection = con
cmd.CommandType = CommandType.StoredProcedure
cmd.Parameters.AddWithValue("@Alphabet", ViewState("CurrentAlphabet"))
con.Open()
dlContacts.DataSource = cmd.ExecuteReader()
dlContacts.DataBind()
con.Close()
If ViewState("CurrentAlphabet").ToString().Equals("ALL") Then
lblView.Text = "all Contacts."
Else
lblView.Text = "Contacts whose name starts with " & _
ViewState("CurrentAlphabet").ToString()
End If
End Sub
Private Sub GenerateAlphabets()
Dim alphabets As New List(Of Alphabet)()
Dim alphabet As New Alphabet()
alphabet.Value = "ALL"
alphabet.isNotSelected = Not alphabet.Value _
.Equals(ViewState("CurrentAlphabet"))
alphabets.Add(alphabet)
For i As Integer = 65 To 90
alphabet = New Alphabet()
alphabet.Value = [Char].ConvertFromUtf32(i)
alphabet.isNotSelected = Not alphabet.Value _
.Equals(ViewState("CurrentAlphabet"))
alphabets.Add(alphabet)
Next
rptAlphabets.DataSource = alphabets
rptAlphabets.DataBind()
End Sub
Protected Sub Alphabet_Click(ByVal sender As Object, ByVal e As EventArgs)
Dim lnkAlphabet As LinkButton = DirectCast(sender, LinkButton)
ViewState("CurrentAlphabet") = lnkAlphabet.Text
Me.GenerateAlphabets()
Me.BindDataList()
End Sub
End Class
View 8 Replies
Apr 26, 2013
I have made a web page in which there is login screen when user login it goes next page but my problem is if i directly enter the url of that page it open. I want it should not open unless the user log in...
View 1 Replies
Jan 1, 2011
i have a user control with 3 textfields (txtQuestion.text), (txtAnswr.text) and txtpts.text... i dragged 5 and drop it on my master can you help me how can i get the value of each user control's field.
View 3 Replies
Apr 9, 2010
I've created a multiple uploadfile user control - upload_multiple_files.ascx:
[Code]....
which has an update panel ID = up_upload_multiple_files this user control will be placed inside a modalpopupextender. My question is when I click in any button AddFile, RemvFile, Upload there's a postback so the page is reloaded and the modalpopupextender disapears Is there a way to to troubleshoot this?
View 8 Replies
Dec 2, 2013
I have create one user control of personal details, and write the geting data from database method and Load the entities in respective field,then how to bind user control in gridview and how to accecc Id of user control in aspx page.
View 1 Replies
Jan 15, 2014
I have a user control with a textbox. I am loading it at runtime on parent page with code behind.After click of button on a parent page i need the text of that usercontrol's textbox.
I tried with following code but it does not work for me
myusercontrol us = new myusercontrol();
TextBox textbox = (TextBox)us.FindControl("txtusercontrol");
string str = textbox.Text.ToString();
View 1 Replies
Nov 10, 2010
I have on dropdown that show hide user control. In the user control i have Ok and Cancel button.
When the dropdown change i want to apply ValidationGroup on the Ok button that is inside UserControl.
View 2 Replies
Mar 1, 2010
i have a Wizard control with 3 steps, in step 2 i have a formview, inside formview1 a have a label and a button.
When i click the button i would like the label to over wright the text of the label.
how can i access this label.
i tryed this with no success.
[Code]....
View 4 Replies
Jan 18, 2011
I have created the user control and it has got one table with few rows in it. One row has got a text box with custom validaor and other row will have check boxes dynamically added through server side.
On the main page, i am loading that user control about 10-15 times depending upon the values from the database.
Is there any way of setting the properties of user control validator on the main page? Text box will only be validated if any check box is checked in the user control.
I am also not able to find the usercontrols through the main page.
View 9 Replies
