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HTML button onserverclick event doesn't work

I'm trying to use the onclickserver on ASP.net to do something when the user clicks on a button but when I click the button nothing happens.
I really can't see what I'm doing wrong.
Here is the button:
<button id="BttnLead" class="bttnBlck" runat="server" onserverclick="BtnLead_OnClick">Lead</button>
And here the event I'm trying to use:
protected void BtnLead_OnClick(object sender, EventArgs e){}
Thank you.

I would bet it has to do with failed validation somewhere on the page, as #kman pointed out in a comment above. Are you using any <asp:FieldValidator/> controls anywhere on the page? If so, and they're not being handled correctly, all you would need to do to cause this button's postback to be triggered is to add the CausesValidation="false" property to the <button> control. This would have the button avoid the validation code that is (if it's the issue, which I really think it is) inevitably failing and thus never reaching the handler method.
P.S. It should be noted that you do NOT have to use an ASP.NET control (i.e. <asp:Button>) and the pure HTML <button> control with the runat="server" property renders a server side control just the same. However, if you're in the ASP.NET world anyway and you have access to these controls, they do provide some benefit that is nice; but that's a different conversation.

onclick event is not fired by input buttons inside a user controls

I've updated my .Net web application to use Framework 4.5, after the update, all the input buttons (not asp:Buttons), have stopped firing the onclick javascript code, this is only happening on those buttons that are inside a user control (.ascx).
Just for the record, user controls are neither being loaded dinamically nor inside update panels.
My buttons look like this
<input id="cb" onClick="myfunc()" type="button" value="Close" />
My user controls are included to the page as follows
<cc:actionbar id="theActionBar" runat="server"></cc:actionbar>
and the javascript function, which is also included within the user control, is
function myfunc() {
if (confirm("Before closing, please make sure you saved any changes.\nAre you sure you want to close?") == true) {
__doPostBack('theActionBar:theClose', '');
}
}
this works just fine on Framework 3.5 and previous versions.
any idea why is this happening??? or how can I solve this?? I have tried several suggestions I've found over the internet and nothing seems to work.
Thanks in advance.
.

I can't see an obvious reason, but have you considered simplifying your approach to avoid the custom javascript and hard-coded postback event reference? You can get exactly the same behaviour with an ASP.NET button's OnClientClick property:
<asp:Button runat="server" ID="btnClose" Text="Close" OnClick="btnClose_Click" OnClientClick="return confirm('Before closing, please make sure you saved any changes.\nAre you sure you want to close?')" />
Returning false from the OnClientClick code or function prevents the postback.
Switching to this approach may be preferable and may even solve your issue if it's something to do with the postback event reference.

Show Popup Message based on Event in C# SharePoint WebPart

There is a Visual WebPart being developed in SharePoint 2010. On load, a set of methods that get and fill information in the WebPart run in the Page_Load method. Somewhere in this process, there needs to be a popup message box or alert box notifying the user that this particular bit of information is not available.
The problem is doing the popup message. A MessageBox.Show will not work in this particular situation as it is a SharePoint Visual WebPart, which is an extenstion of ASP.NET. Adding System.Windows.Form is possible and it would make MessageBox.Show work, but only on the development machine. It will not work for any of the clients on their browsers. Adding the following to the ASP code is possible, but one of the objectives is to minimize user interaction.
<asp:Button ID="btnCheckInfo" runat="server" Style="z-index: 101; left: 216px; position: absolute;
top: 160px" Text="Check Information" OnClientClick="return confirm('change a record, would you like to continue ?');" />
Having this happen automatically instead of having the user click a button would be ideal.
Is this at all possible? Is it possible to add a popup message box of some kind to a SharePoint Visual WebPart that can be called/triggered within a method instead of as a click event?
Hopefully the question is clear enough. I'm not an experienced C#, .NET or SharePoint programmer.
Thank you in advance for you help and advice!

You can use the RegisterStartupScript to add some javascript to your page from anywhere you want (ie in the page_load method)
if(something)
{
ScriptManager.RegisterStartupScript(Page, Page.GetType(), "confirm", "change a record, would you like to continue ?');", true);
}
You would need to handle what happens when the user clicks OK

asp.net Button OnClick event not firing

I have problem in asp.net button control.
I define a button in form, onclick event of button is not firing when I click on the button.
<asp:Button ID="btn_QuaSave" runat="server" Text="SAVE" OnClick="btn_QuaSave_Click" />
protected void btn_QuaSave_Click(object sender, EventArgs e)
{
}

Because your button is in control it could be that there is a validation from another control that don't allow the button to submit.
The result in my case was to add CausesValidation property to the button:
<asp:Button ID="btn_QuaSave" runat="server" Text="SAVE" OnClick="btn_QuaSave_Click" CausesValidation="False"/>

Have you copied this method from other page/application ? if yes then it will not work, So you need to delete the event and event name assigned to the button then go to design and go to button even properties go to onClick event double click next to it, it will generate event and it automatically assigns event name to the button.
this should work

I had the same problem, my aspnet button's click was not firing. It turns out that some where on other part of the page has an input with html "required" attribute on.
This might be sound strange, but once I remove the required attribute, the button just works normally.

If you are using updatepanel on onclick event, this may happen.
Use 'EnableEventValidation="false"' in your page markup like this :
<%# Page Language="C#" MasterPageFile="~/ars_home.master" AutoEventWireup="true" CodeFile="Transaction_Window.aspx.cs" Inherits="Transaction_Window" EnableEventValidation="false" %>
Hope this helps

I had a similar issue and none of the answers worked for me. Maybe someone finds my solution helpful. In case you do not mind submitting on button click, only attaching to click event setting UseSubmitBehavior="false" may be worth trying.

In my case I put required="required" inside CKEditor control.
Removing this attribute fixed the issue.
Before
<CKEditor:CKEditorControl ID="txtDescription" BasePath="/ckeditor/" runat="server" required="required"></CKEditor:CKEditorControl>
After
<CKEditor:CKEditorControl ID="txtDescription" BasePath="/ckeditor/" runat="server"></CKEditor:CKEditorControl>

i had the same problem did all changed the button and all above mentioned methods then I did a simple thing I was using two forms on a single page and form with in the form so I removed one and it worked :)

Try to Clean your solution and then try once again.
It will definitely work. Because every thing in code seems to be ok.
Go through this link for cleaning solution>
http://social.msdn.microsoft.com/Forums/en-US/vsdebug/thread/e53aab69-75b9-434a-bde3-74ca0865c165/

Try to go into Design mode in Visual Studio, locate the button and double click the button that should setup the event. Otherwise once the button is selected in Design more, go to the properties and try setting it from there.

Add validation groups for your validator elements. This allows you distinguish between different groups which to include in validation. Add validation group also to your submit button

in my case:
make sure not exist any form element in your page other than top main form,
this cause events not fired

If the asp button is inside tag then also the Click event will not raise.
Hope it's useful to some one.

In the case of nesting the LinkButton within a Repeater you must using something similar to the following:
<asp:LinkButton ID="LinkButton1" runat="server" CommandName="MyUpdate">LinkButton</asp:LinkButton>
protected void Repeater1_OnItemCommand(object source, RepeaterCommandEventArgs e)
{
if (e.CommandName.Equals("MyUpdate"))
{
// some code
}
}

If it's throwing no error but still not firing the click event when you click the submit button, try to add action="YourPage.aspx" to your form.

Even i had two forms one for desktop view and other for mobile view , Removed one formed worked for me . I dint knew asp.page should have only one form.

Try this onserverclick
<button id ="DemoButton" runat="server" onserverclick="button_Click">Login</button>

Detect which button is clicked in Page_Load?

In my asp.net web page, there are a few of buttons and checkboxs. They all can cause postback.
Can I detect which control is clicked? Because I will add code for if clicked a button then do something.
I saw that some examples are done with Jquery.
Can we just do it in C#?
Thanks.

Why are you not just using the click behavior of the button:
ASPX
<asp:Button id="Button1"
Text="Click here for greeting..."
OnClick="GreetingBtn_Click"
runat="server"/>
CS
void GreetingBtn_Click(Object sender,EventArgs e)
{
}
reference here

You could check Request.Form["_EVENTTARGET"] for the control that generated the postback

well if each of the buttons submit a key value to the post or get parameters, and theyre all different it should be pretty easy! :)
localhost/home.html?button=clicked&link=selected
the above is an example of a get parameter url, you can use jquery to get those, or if its a post you would have access to them in a similar way...the previous page would have to have been a form though.

You could eventually do it by checking Request.Form["_EVENTTARGET"] but that is highly unusual and certainly not necessary.
Whatever you need to do, you can do it in the Click event handler of the given control.

You can set a server hidden control specifying the action (checkbox/textbox/button clicked) using javascript & retrieve that server control in page load to check its action & add your code for that action