Javascript – How to ask the user for confirmation of an action with a popup box

I'm currently coding a button which will delete a record from a database if clicked. However, I want some sort of confirmation after they click it so there are no accidents. I was imagining a popup box that tells them they are about to delete this record with two buttons cancel and OK. If cancelled, nothing happens, but if OK is pressed, then the server would execute the delete as coded. How would I do this in asp/vb?

Best Solution

Here is a button with a confirmation message :

<asp:Button runat="server" ID="btnDelete" 
     OnClientClick="return confirm('Do you want to delete the record ? ');" />

Here is the way to add confirm client script at server side :

        "return confirm('Do you want to delete the record ? ');")