How can I set periority two function/method on one button click? Asp.net C#

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C#

ASP.NET

Hi..
My question is how can i set priority of tow function/method on one button click.I have one java script function call and one method is code behind.I want when i click on button then first javascript function call,its takes value and then other function call which is code behind,on single button click(ASP.NET ,C#)

What I have tried:

Here is my code aspx :

<script type="text/javascript">
    function myFunction() {
        var person = prompt("Enter Table Name");

        if (person != null) {
            document.getElementById("txtName").innerHTML = person;
       
        }
    }
</script>
Table Name<asp:TextBox ID="txtName" runat="server" Width="146px"></asp:TextBox>
 <asp:Button ID="Button2" ValidationGroup="s" runat="server" onclick="insert" Text="Create Table" /> //'insert '(code behind method) i want first myfunction call then "insert" method call.

How can i do this?