How to get the response from Confirm box in the code behind

Question

I am new to asp.net/C# .I am trying to create a web application.

Below is my requirement.

I am trying to save a record on button click. Before saving the rec

Answer 1

You can use confirm box in JS like this

var ans = confirm ('Record already exist.Do you want to proceed?');
if(ans==true)
{
}
else
{
}

Secondly, to get the response in code behind, you can store the Yes/No value into a hidden field e.g.

document.getElementById('<%= hiddenField.ClientID %>').value = ans;