Cannot Access My UI Controls In C# Code
Aug 31, 2010
I cannot access my UI controls on my ASP.Net website.
When I create a brand new form and drag a control on it, I can use C# to change the properties of the control easily, like one would expect.
But when I try to do the same on another page, I cannot access any control whether I drag a new control on the page or not.
It seems the code behind and the visual page aren't connected.
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Similar Messages:
Aug 12, 2010
I have a code to link to sql can anyone give me the same code for microsoft access....
try
{
int videoID = Convert.ToInt32(Request.QueryString["ID"]);
SqlConnection conn = new SqlConnection("server=WEBDESIGN-PC;database=Credentials;uid=sa;pwd=Azeem;");
conn.Open();
SqlCommand cmd = new SqlCommand("SELECT * FROM videopath WHERE videoID=" + videoID, conn);
SqlDataReader dtr = cmd.ExecuteReader();
dtr.Read();
FlashVideo1.VideoURL = Convert.ToString(dtr["Filepath"]);
Label1.Text = Convert.ToString(dtr["Filename"]);
conn.Close();
}
catch (Exception ex)
{
Label1.Text = Convert.ToString(ex);
}
finally
{
}
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Dec 18, 2010
I have a checkbox and a panel inside of a FormView control, and I need to access them from the code behind in order to use the checkbox to determine whether or not the panel is visible. This is the code that I originally used, but since I put the controls inside of the FormView, it no longer works.
Protected Sub checkGenEd_CheckedChanged(ByVal sender As Object, _
ByVal e As System.EventArgs)
If checkGenEd.Checked = True Then
panelOutcome.Visible = True
Else
panelOutcome.Visible = False
End If
End Sub
I've started to figure this out based on other questions I looked up on here, but all of them were in C# instead of VB, so this is as far as I got:
Protected Sub FormView1_DataBound(ByVal sender As Object, ByVal e As System.EventArgs) Handles FormView1.DataBound
If FormView1.CurrentMode = FormViewMode.Edit Then
End If
End Sub
So yeah I'm not sure exactly how to finish it. here's my code now:
Protected Sub FormView1_DataBound(ByVal sender As Object, ByVal e As System.EventArgs) Handles FormView1.DataBound
If FormView1.CurrentMode = FormViewMode.Edit Then
CheckBox checkGenEd = formview1.FindControl("checkGenEd");
Panel panelOutcome = formview1.FindControl("panelOutcome");
End If
End Sub
It's also saying that checkGenEd and panelOutcome are not declared. I changed my code to this but it still doesn't work:
Protected Sub FormView1_DataBound(ByVal sender As Object, ByVal e As System.EventArgs) Handles FormView1.DataBound
If FormView1.CurrentMode = FormViewMode.Edit Then
Dim checkGenEd As CheckBox = FormView1.FindControl("checkGenEd")
Dim panelOutcome As Panel = FormView1.FindControl("panelOutcome")
If checkGenEd.Checked = True Then
panelOutcome.Visible = True
Else
panelOutcome.Visible = False
End If
End If
End Sub
There aren't any errors anymore, but nothing happens when I click the checkbox. I think there needs to be some kind of event to trigger it but I don't know how you can put an event handler inside of an event handler.
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Jan 10, 2011
I am building up asp:ControlParameters in my SqlDataSource at design time that all have ControlIDs based on textboxes and radiobuttons in my form, and those seem to work OK. Now, I want to build my SQL select query up in the PageLoad event and I can't seem to get the values of these SelectParameters. If at design time I create a ControlParameter like:
[Code]....
...why is it giving me an error saying "ERROR: Microsoft SQL Server: Must declare the variable '@cp_employee_last_name'"? That SQL Where clause should just be whatever the user typed into tbEmployeeLastName.Text, right?
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Sep 28, 2010
I have a 2 textboxes in a Login View on my Content Page (login.aspx) and Login Button outside of Login View. I want to pass the values of those textboxes to the members of class when user hit Login button.
I have User.cs class which contains TxtLogin and StrLogin.
[Code]...
When I debug the program and enter correct username and password it should show me "Thank you" rather than it is showing me "Enter valid Username and Password".
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Jan 13, 2011
Is there any way to access code behind for controls in content pages??
Actually i've a content page and i've added some controls(say button) to it. Now, if i want to write some code on button_click , how do i do it? because i'm not able to get to the code behind for these controls. I can only see Page_Load in the code behind aspx.cs page
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Mar 23, 2010
I am using the following code to insert data into an Access Database. Also this is the sqlcommand.
UPDATE TASKS Set Notes="bunch of html code" WHERE APPLICATION="SomeApp"
However I get an error. How can I input data regardless of what is in the command area?
'Dim ConnString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|AddCol.mdb"
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Mar 25, 2011
I have been asked to support a legacy app and I can't get access to the code behind files. I need to add a new feature that gets a list of items from the database on page_load, what way would adding an "in-page" page_load affect the compiled page_load?
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Jan 18, 2011
i have a div inside a gridview. Now I need to access the div from code behind to change its background color
for some specific data.
[Code]....
I am trying to access the DIV from gridview row data bound without any success.
[Code]....
I have the following error
"System.NullReferenceException: Object reference not set to an instance of an object."
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Jul 22, 2010
I want to access my checkbox in code behind. I have my checkbox in my aspx file like this:
[Code]....
And i'm trying to set the checkbox visible=false like this but it's not working. Error message: Object reference not set to an instance of an object.
[Code]....
This is just one thing i want to do with my controls in my datalist, so i don't want to in my aspx file like this:
<asp:CheckBox ID="CheckBox1" runat="server" Visible='<%# if(Eval("isFolder")="1","false","true") %>' />
Because i have quite a lot of things i would like to do in the code behind when i'm getting my files..
Is it possible somehow to achieve this without having to put servercode in my aspx file?
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Jan 24, 2011
I have a dropdownlist in a headertemplate but I can't seem to access it in the code behind to work with the onselectedindexchanged event. I want to change the data that is shown on the event but can't access the control.
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Jun 16, 2010
My problem i am facing is that i do not know if it's possible to access a single field in my case sold from the following code.
[Code]....
What i want to do is have the checkbox true if the value of sold = yes and false if the value = no I have the checkbox ready on the asp.net side but just need for the checkbox to recognise the datafield, sold, and do and if check statement, is this possible if not i will work around it.
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Nov 3, 2010
foreach (Control control in ContentPlaceHolder1.Controls)
{
if(typeof(Control).Equals(Telerik.Web.UI.RadEditor))
{
label1.Visible = true; label1.Text = "dhchk";
// control.CssFiles.Add("~/styles/myStyle.css");
}
}
Error;-
'Telerik.Web.UI.RadEditor' is a 'type', which is not valid in the given context
Also, is this the correct way to add CSS class to radEditor controls ??
control.CssFiles.Add("~/styles/myStyle.css");
I actually wanna add 3-4 customized classes..how to do that?
also I was wondering if I can add some javascript or something in my Master page that will detect the ALL the radEditor controls and set their css classes ? don't know much of Javascript..how can that be made possible? how do I go about that? but first I want css classes to be set in code behind..what's wrong with the code?
[EDIT]
@Geek..I tried calling like this..is it correct?
Control c = new Control();
DoSomething(c);
now its giving this error in the method:-
The type or namespace name 'c' could not be found (are you missing a using directive or an assembly reference?)
[EDIT]
I do have this namespace added "using System.Web.UI.WebControls;" why this error ??
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Dec 10, 2010
Access client side code from code behind. Is there a way to do this? How can i do this?
I have an object embedded on my web form. I need to access this object and change its properties at runtime.
How can i do this?
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Aug 10, 2010
Let me try to explain my situation. I have a database table which contains, among other things, a boolean column called PermissionSlipRequired. I have a repeater on my page, and before each row in the database is shown in the repeater, I want to use my code behind to check the value of PermissionSlipRequired. Based on whether the value of PermissionSlipRequired is true or false, I want to change the text of a literal within the repeater. That's a real mouthful; hopefully some markup and code will clarify. Here's my repeater:
[Code]....
Here is what I've been able to come up with for my code behind. Needless to say, this code doesn't work.
[Code]....
As a former PHP user who is trying to migrate to asp.net.
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Aug 31, 2010
I'm trying to access a certain div tag from the C# code behind, but when I use the div's id it doesn't recognize it.the html:
<div id="Div1" runat="server" visible="false"></div>
in the code behind, when I try to to this:
if(.....)
{
Div1.Visible=true;
}
it doesn't recognize "Div1"am I missing a namespace maybe?here is what I'm using right now:
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Jul 23, 2010
I have an usercontrol with fck editor for allowing user to add note in my aspx page, which allows the user all kind of text formatting.My need is that I have to access user control from the code behind and collect the content as the same format some one has entered in the fck editor.How can I do this?
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Sep 29, 2010
I am an experienced web developer but sometimes ASP.Net is tricking me. I have a master page in asp.net. Then I have a page based on that master page (home.aspx). Now in home.aspx.cs I want to access the asp:content controls to add controls programmatically.
Aspx looks like this:
<asp:Content ID="leftCol" ContentPlaceHolderID="cphLeftCol" Runat="Server">
<asp:PlaceHolder ID="phLeftCol" runat="server">
</asp:PlaceHolder>
</asp:Content>
I would expect that I can reference "leftCol" from my code behind. But it's unknown there. For testing I added my own placeholder "phLeftCol". I can reference that without issues.
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Feb 9, 2011
I am dynamically creating div tags in my code behind and adding code into the innerHTML property of the div tag and then rendering out the html to replace values inside of a table structure that I have, I then place all the table code onto the page. I want to be able to access the div tags again from the code behind, but can't seem to because well obviously they aren't set to runat="server". Is there any way to do this or to set them so they can runat server.
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Apr 28, 2010
my application runs on the client side. I have to access a display on the asp page via javascript. I have the following code working properly:
ClientSript.RegisterStartupScript(this.GetType(), "allMessages", "<script>document.forms[0].tbDisplay.value='Messages'; </script>");
tbDisplay is a "text box" asp:textbox control. I need to replace de 'Messages' for avariable. so instead of printing "Messages" all the time, I can change the information on the variable prior to display the message. how to change 'Messages' to a variable.
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May 19, 2010
Is there a way i can access a certain textbox in the .asps.cs file code?
I have an insert statement where i have a textbox like so for example:
PHP Code:
<asp:TextBox ID="txt_title" runat="server"</asp:TextBox>
And then in the backend i access it like to txt_title.Text;
This is fine. However i have a calendar popup which is shown:
PHP Code:
[code]....
A calendar popup appears when i click on the button. Now i need to insert the textbox value in the database but i cant seem to get access to it in the .cs file. I have tried adding runat="server" but it then stops the popup from working.
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Oct 27, 2010
I was wondering if I could add a user control to a page with a parameter and then access that parameter in the code behiind for initiallization.
For example on my aspx page i would have somethign like.
[code]...
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Jan 11, 2011
I have this website where I want just only the computers in our office have access to it. How can I write code to do this? I've been looking all over the web but I couldn't find anything like this. Sorry I couldn't write any code about this before posting this question.I will be using this part of code in the header.aspx file.
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Dec 8, 2010
I have an .aspx file that has 3 drop down lists:
ddlMake
ddlModel
ddlColour
i have a Page_Load function but i cant acces them in the Page_Load function...
using System;
using System.Collections.Generic;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
namespace NorthwindCascading
{
public partial class _IndexBasic : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
CarService service = new CarService();
List<string> Makes = service.GetCarMakes();
ddlMake.DataSource = Makes;
ddlMake.DataBind();
ddlMake.Items.Insert(0, " -- Select Make -- ");
}
}
}
}
I have added the code-behind file manually so i guess i am missing something... it just says that the ddlMake element is not defined in current context.
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Dec 22, 2010
I have a user control called adminMenu and I use it in my index.aspx and all is fine, but I need to access a MenuItem in adminMenu and need to change NavigateUrl on the MenuItem. Tried this code with no luck:
MenuItem MaintenanceReports = this.adminMenu.FindItem("MaintenanceReports");
Not sure if I should be accessing adminMenu properties from controls code behind, but when I try from controls code behind was not able to access it either.
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