Asp button is called by default postback method

Question

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

Answer 1

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.

Answer 2

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" %>