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asp:Button not responding to clicks with OnClick

I seem to be having a problem with my button's OnClick, it doesn't even react at all to the event. It responds to OnClientClick and executes the code, but when I try to relate it o a function in my .aspx.cs class it just ignores it, and it should be executing very simple code (writing to the output debug)
I've checked every other stackoverflow post about this I could find and no one had the same issue.
I know that my Index.aspx is executing the code inside Index.aspx.cs because the Page_Load function is outputting to the debug window, so that's not the problem.
Here's the important code:
<asp:Button ID="btnCreateOrder" runat="server" Text="Create Order" OnClick="btnClick" />
protected void btnClick(object sender, EventArgs e)
{
System.Diagnostics.Debug.Write("Testing3");
}
Like I said the Page_Load function is working fine so it's not an issue of them not being connected.
DIFFERENT PROBLEM IF YOU FEEL SO INCLINED:
While you're reading, I also have a problem of not being able to find objects from my HTML in my CS file.
What I mean by that is, if I reference this label:
<asp:Label ID="testLabel" runat="server" Text="test"></asp:Label>
by saying
testLabel = "Test2";
I get the error "The name 'testLabel does not exist in the current context"
And if I try to reference it by saying this:
Index.testLabel = "Test2";
I get "'MyProject.Views.Home.Index' does not contain a definition for 'testLabel'" even though it clearly does.

Maybe the .designer file is bad.
Try this: delete the .designer.cs file of your .aspx page, right-click on it and select the 'Convert to web application' option.
EDIT: As for the Button event, how did you generate the method stub for the click event? Did you click the button on the designer view twice and the visual studio generated id for you or did you handcoded it?
Try to delete both the button and the button click event, and when you declare the button again, double click it on the designer view.

"System.Web.UI.MasterPage does not contain a definition..." ASP.NET error

EDIT: The main problem seemed to be that I was just doing "Add Existing Item" from an old web site project into an ASP.NET Web Application project. This caused so much trouble I just started from scratch, except that instead of adding existing items, I added new Master Pages and aspx pages to the project then populated them. The same problem persists.
I have a legacy project that is just a standard web site. I've started a new project as a web application and have transplanted in all the pages I need. However, I'm receiving 100+ errors that are comprised mostly of slightly different permutations of the following:
'System.Web.UI.MasterPage does not contain a definition for 'headerImage' (I get this in code-behind)
'MasterPage' does not contain a definition for 'imgHeader' (also this is in code-behind)
Regarding the first error, it's as though the project is not comprehending that the master page is set. I set the master page at the top of each one of my aspx pages like:
<%# page language="C#" masterpagefile="~/MasterPages/MasterPage.master" autoeventwireup="true" inherits="Equipment.aspx.cs" title="Untitled Page" %>
<%# MasterType VirtualPath="~/MasterPages/MasterPage.master" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<!-- some content -->
</asp:Content>
Also, I clearly expose a headerImage property in the ~/MasterPages/MasterPage.master code-behind:
public partial class MasterPage : System.Web.UI.MasterPage
{
#region Properties
private string _headerImage;
public string headerImage
{
get
{
return _headerImage;
}
set
{
_headerImage = (string)value;
}
}
// other stuff
}
And yet VS is still looking for this property in the System.Web.UI.MasterPage base class!
I've already checked out this post and it didn't solve my problem.
Thoughts? All feedback is appreciated. Thanks guys.

Good morning when you added the existing files to your new web application did you recreate them all from scratch or did you do a literal "Add Existing Item"? If so, then you should right click on each of the files and click the "Convert To Web Application" option.

Check what is the namespace of this.Master.
If it's System.Web.UI.MasterPage, try to rename your master page to a different name. This way you can isolate the problem.

My answer is similar to that of #mreyeros - however, my designer file was present already - it was that Vs didn't recognise the partial nature of the none- designer class and thus link the 2 together.
The fix I used was to remove the files from the project and re-add them using add existing. I did this in bulk and the newly added files behaved correctly and the error went away.

designer.cs issues with using user control in Visual Studio

During my development, I have a web user control project and another web project which will use the user controls from the web user control project.
So I copy the DocControl.ascx file to my web project and try to use the properties of the DocControl.ascx.
But VS does not know the properties of the control. So when I check the designer.cs, the reference is like that
protected global::System.Web.UI.UserControl Control;
Which should be
protected global::MSN.DocControl Control;
So I changed the name of the control from System.Web.UI.UserControl to MSN.DocControl and I can use the properties of the DocControl.ascx.
But my issue is whenever I modify ( eg. put a lable in aspx) the aspx file, the reference in designer.cs become
protected global::System.Web.UI.UserControl Control;
So I has to change it whenever I modify my aspx.
What should I do so I don't need to change the designer.cs
Thanks in advance......

I have solved it by moving
protected global::MSN.DocControl Control;
from designer.cs to .cs page.
So whenever you made any changes, it will be OK.
#kokbira - > hope that it helps you.

In my case, it was a bad src path in my register line. This caused no error messages, but would generate the generic control instead of the specific class, with the same symptoms you describe.
I had this (which has the wrong Src path):
<%# Register TagPrefix="uc" TagName="Pipes" Src="/Controls/Pipes.ascx" %>
...
<uc:Pipes id="ucPipes" runat="server" />
and it generated this, which is generic, and has none of the control's properties:
protected global::System.Web.UI.UserControl ucPipes;
When I did the correct path, with Category folder, it worked:
<%# Register TagPrefix="uc" TagName="Pipes" Src="/Category/Controls/Pipes.ascx" %>
...
<uc:Pipes id="ucPipes" runat="server" />
and generated this correct one, so all properties worked:
protected global::Company.Category.Controls.Pipes ucPipes;

C# Button Click

I have the following button on a .aspx page:
<asp:Button runat="server" ID="bntLogin" OnClick="bntLogin_Click" Text="Login" />
With the following in the .aspx.cs:
protected void bntLogin_Click(object sender, EventArgs e)
{
//
}
When I try to build it I get the following error:
'ASP.reserve_aspx' does not contain a definition for 'bntLogin_Click' and no extension method 'bntLogin_Click' accepting a first argument of type 'ASP.reserve_aspx' could be found (are you missing a using directive or an assembly reference?)
However, when I move the click event from the code-behind to a script block inside the markup it builds.
Any ideas?

Are you sure that you placed the method in the correct code-behind file?
Check which file you are using as your code-behind file by looking at the #page directive at the top of the aspx file itself (check the inherits attribute) - you may be surprised.
A loosely-related side note: By setting the OnClick with a string value that corresponds to the method you wish to invoke you are implicitly relying on ASP.NET's AutoEventWireup feature which I don't consider to be a good approach. It is better to manually wire up your controls in your page's OnInit override method like this:
bntLogin.Click += bntLogin_Click;
By relying on AutoEventWireup you are allowing the ASP.NET runtime to create this code for you and since this happens at execution time you are incurring an execution time performance penalty as well as risking an exception like the one you are seeing now.

I usually hook up the events in the code-behind's OnInit method, which is a hold-over from ASP.NET 1.1 (that's where the designer would put it back then.)

If by any chance you're still running ASP.NET 1.1, delete the aspnet_client folder, rebuild and try again.

ASP.net CS1061 Compilation Error on deployment

I'm having a bit of a pain here and I just can't figure out what's wrong.
I have an ASP.net project which I deployed on a server. At first everything seemed allright, no Errors whatsoever. However, as a last adition I wanted to add a search function to a fairly large list so I added the following syntax to my mark-up:
<td>
Search Server:
<asp:TextBox ID="txtSearch" runat="server" />
<asp:Button ID="btnLookup" runat="server" OnClick="btnLookup_Clicked" Text="Search" />
<asp:Label ID="lblFeedback" runat="server" />
</td>
and the following in code behind:
protected void btnLookup_Clicked(object sender, EventArgs e)
{
lblFeedback.Text = "";
Session["IsSearch"] = true;
LoadServerList();
}
When I run this locally it works just fine as I expect.
HOWEVER!
When I copy these files to the server I get a compilation error:
Compiler Error Message: CS1061: ' ASP.ntservice_ reports_ reports_ serverlist_ manage_ aspx ' does not contain a definition for 'btnLookup_ Clicked' and no extension method 'btnLookup_ Clicked' accepting a first argument of type 'ASP.ntservice_ reports_ reports_ serverlist_ manage_ aspx' could be found (are you missing a using directive or an assembly reference?)
it says there is nothing that handles my Clicked event although it does work when I run it through Visual studio.
any ideas?
EDIT:
What I tried myself is
renaming button
deleting and readding the button
add through designer
renaming click event
removing the event from markup allows normal execution ... :/

Is your project a web site or a web application? I would guess that it's a web application project and that perhaps you don't have the latest DLL deployed from the bin folder. Check the versions between your machine and the server to verify that they are the same.

I think this error is generated when you change an object Name, ex.
Text1 -» txtSerialNo I had the same problem but I could fix it. Here is the solution:
Go to Split Mode, click on the textbox/object, in the code remove the line
[**ontextchanged="txtSerialNo_TextChanged"**]
From:
[<asp:TextBox ID="txtSerialNo" runat="server"
ontextchanged="txtSerialNo_TextChanged"></asp:TextBox> //remove this line]
To:
[<asp:TextBox ID="txtSerialNo" runat="server"</asp:TextBox>]
I hope it works for you. Bless you.

I experienced same problem. And I made the event handler method public, problem solved!
Thanks!

Did you deploy the dll?

Do you set
<%# Page ... Language="C#" CodeBehind="... .aspx.cs" Inherits="..." .../>
in your page directive correctly?

This should fix it if you did everything else right:
Try to make an entirely new click event (using the split view, just to be sure you get the method signature right.)
Then copy your code from your previous clicked event into the newly created event, copy the new event's method name to your original button and see if it works.

Try renaming the event handler to some thing OnClick="buttonLookup_Clicked"... and changing the event handler signature to match it.

having the same issue myself, I made the method public so that removed the compiler error, then followed that with including everything within
<form runat="server">
.....
<asp:Button id... OnClick="MethodName"/>
</form>
Hope this helps

Make the events your onclick events point to public.

This can happen if the event is signed-up for programmatically AND also in the markup (via the properties)

go to Build ==> Clean Solution ==> Run (f5)

I just restarted my ASP.NET Development server then its running again.

I experienced the same problem with you, but I fix it by include CodeFile="xxxx.aspx.cs" into my page directive, hope this help.

Right Click on the form which affected and go to properties, change the Build Action to Compile. typically this error comes when the Build Action changed to resource.

In my case this issue occurs when there are two projects in solution, and the second project has reference of first project dll.
When you add new members to the class in first project make sure you build the first project first and then second project will compile successfully