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Asp button is called by default postback method

ASPX code :
<asp:Button ID="medicalSub" runat="server" ValidationGroup="medical" Text="Save" CausesValidation="false" UseSubmitBehavior="false" ClientIDMode="Static" OnClick="medicalSub_Click" />
ASPX.CS code :
protected void medicalSub_Click(object sender, EventArgs e)
{
console.writeline("hello");
}
Error

According to that stack trace, the problem is not calling the click method. Instead, it's failing trying to load viewstate for a dropdown list control. This is long before trying to handle any events.

Try this:
copy and paste this in your page load section of your code and check if that helps:
If(!IsPostBack)
{
}
Or the following will hep:
<%# Page so just add the rest => EnableEventValidation="false" %>

ASP.NET Button Not Calling Event

I've created an ASP.NET button like so:
<asp:Button ID="btnSaveCoords" runat="server" OnClick="btnSaveCoords_Click" Text="Save Changes" CssClass="btn btn-warning" />
and the event in the OnClick is defined as follows:
protected void btnSaveCoords_Click(object sender, EventArgs
{
System.Diagnostics.Debug.WriteLine("Saving Coordinates...");
}
When I click the button, btnSaveCoords_Click isn't fired. What am I doing wrong?

The firs row in the .aspx markup file should be like this:
<%# Page Language="C#" AutoEventWireup="true"
CodeBehind="WebForm1.aspx.cs" Inherits="SportStore.Views.WebForm1" %>

ModalPopupExtender Hault Execution Until Ok is Clicked?

Perhaps I misunderstood the control, or very possibly am not implementing it correctly, but I've used a ModalPopupExtender much like I'd like to use a MessageBox in desktop development. The problem I'm running into is that once I call the Show() method of the ModalPopupExtender it continues to execute the server side code despite the fact that the user has not yet clicked the button set as the OkControlID. Is this the normal behavior, and or is there a way to hault code execution until the OkControlID has been clicked. To specify, I don't want to create another event in the button click handler as this popup is inline. Here is my code - any advice is appreciated.
My Control:
<%# Control Language="C#" AutoEventWireup="true" CodeBehind="ModalMessage.ascx.cs" Inherits="LB.ModalMessage" %>
<asp:Button ID="btnPopup" runat="server" style="display: none;"/>
<ajaxToolkit:ModalPopupExtender ID="ModalMessageExtender" runat="server"
OkControlID="btnOkay" PopupControlID="Panel1"
TargetControlID="btnPopup" BackgroundCssClass="modalPopupBG">
</ajaxToolkit:ModalPopupExtender>
<asp:Panel CssClass="whitebubble" ID="Panel1" style="display: none; max-width:400px;" runat="server">
<div style="padding:5px 5px 35px 5px;">
<asp:Label ID="lblMessage" Font-Size="Medium" runat="server" ForeColor="Black"/>
<br />
<asp:Button runat="server" Text="Ok" Width="75px" Height="30px" ID="btnOkay" CssClass="modalButton gray modalButton"/>
</div>
</asp:Panel>
The control code behind:
public void ShowMessage(string message)
{
this.lblMessage.Text = message;
ModalMessageExtender.Show();
}
My content page:
<%# Register Src="~/ModalMessage.ascx" TagName="ModalMessage" TagPrefix="mm" %>
<mm:ModalMessage runat="server" ID="mpeMessage"/>
My content code behind:
mpeMessage.ShowMessage("Please enter a username before attempting to reset your password.");
UPDATE:
Sorry for the lack of clarity - let me make my question more clear. If I do the following:
mpeMessage.ShowMessage("Please enter a username before attempting to reset your password.");
Response.Redirect("Register.aspx");
The redirect occurs and the ModalPopupExtender never gets shown. I'm somewhat new to web development so please forgive me if I'm using incorrect terminology. But essentially, I want the execution of code in the code behinds to wait for the user to click "Ok". I'm trying to replace something like this:
ScriptManager.RegisterStartupScript(this, typeof(string), "Message", "alert('Your new account has been created!'); window.location='" + continueUrl + "';", true);
With something a little nicer looking, and since I'm already doing a postback anyway, I thought calling the ModalPopupExtender programmatically would be fine. Hopefully this clears up my question. Thank you all for your responses so far.

You can use validation controls , to check whether the fields are properly filled or not
for more details check the following links:
http://www.w3schools.com/aspnet/aspnet_refvalidationcontrols.asp
http://msdn.microsoft.com/en-us/library/aa479013.aspx

If i am understanding your query correctly then you want that until user does not click on "ok" button on modelpopup, user should not be able to click on page.
if you want this then add PopupDragHandleControlID="Panel1" in your modelpopup control.
<ajaxToolkit:ModalPopupExtender ID="ModalMessageExtender" runat="server"
OkControlID="btnOkay" PopupControlID="Panel1" PopupDragHandleControlID="Panel1"
TargetControlID="btnPopup" BackgroundCssClass="modalPopupBG">
</ajaxToolkit:ModalPopupExtender>
UPDATE
just replace Response.Redirect("Register.aspx"); to btnOkay click event.
on aspx page -
<asp:Button runat="server" Text="Ok" Width="75px" Height="30px" ID="btnOkay" OnClick="btnOkay_Click" CssClass="modalButton gray modalButton"/>
on aspx.cs page -
protected void btnOkay_Click(object sender, EventArgs e)
{
Response.Redirect("Register.aspx");
}
then until user will not click on "Ok" button. he/she can't redirect to Register Page.

Visual Web Developer html button onclick event didn't fire

Below is my code:
default.aspx:
<%# Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master"
AutoEventWireup="true" CodeBehind="Default.aspx.cs"
Inherits="TestAjax._Default" %>
<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
//I set an onClick event on this button:
< input type = "button" id="btnCl" onclick = "doJob" />
</asp:Content>
default.aspx.cs:
protected void Page_Load(object sender, EventArgs e)
{
//fires on page load;
}
void doJob()
{
//code here;
}
The question is:
Why didn't the onclick event trigger? (On default.aspx btnCL)
Thanks

You need to use an asp:Button control like this:
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
and then have the event method like this:
protected void Button1_Click(object sender, EventArgs e)
{
// your code here
}
When using a regular input tag, onclick is for javascript, you have to instead use the ASP.NET control asp:Button in order to hook up the C# method.

As stated in my comment in OP your current method is making a client-side call (so looking for a JavaScript function called doJob. You need to make a server-side call so need to use an <asp:Button> control. Some example of how you could achieve this:
Web-Page (.aspx)
<asp:Button ID="btnDoJob" Runat="server" Text="Do Job" OnClick="btnDoJob_Click" />
Code-Behind (.CS)
protected void btnDoJob_Click(object sender, EventArgs e)
{
// Do your action here...
}

Because dojob() is a server-side function, but onclick on that input element is a client-side event. You're probably getting an error in your JavaScript console saying that dojob() is an undefined function.
Use an asp:Button instead of an input to make use of server-side click events. Also, dojob() should be protected. By not declaring a protection level I think the default is private so the page controls might not even be able to see it. It should match the event handler for a button click:
protected void dojob(Object sender, EventArgs e)
{
}

Button click is not working in usercontrol Umbraco

I started to build a website using Umbraco and I noticed that button click events (and probably other events) are not working.
I created simplest usercontrol with one button, added it to a page, When I debug it the Page_Load is called (breakpoint being hit), but not button click.
The code is very standard, but here it is:
.aspx file
<%# Control Language="C#" AutoEventWireup="true" CodeFile="TestControl.ascx.cs" Inherits="usercontrols_TestControl" %>
<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
and code behind:
protected void Button1_Click(object sender, EventArgs e) {
Label1.Text = "Button clicked!";
}
Where can be the problem?

Make sure you are wrapping your body with <form runat="server">...</form> tags, the user control/macro should be inside the form tags. Also ensure that you are adding the user control correctly. To help you out with this, here are a few resources:
A demo by Niels Hartvig. (Niels is using a current Umbraco version.)
Tim Geyssens' screencast. (Tim is using an older version of Umbraco in the screencast (not 4.7.*), but there isn't much difference.)
Step-by-step instructions by Skiltz.