Need to executeJavaScript confirm as Message box of c#

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ASP.NET

Please Help me.

I have the following code.

The java script code has to be executed and send back the result so that i could execute my operation next line.

The problem is i get the confirm box after the click event gets executed.

Can any one provide me solution?

Thanks in advance

Java Script:

<script type="text/javascript">
      function GetResult()
      {
       var ans = confirm('Are you the people from Planet Earth?');
        if(ans)
        document.getElementById("HiddenField1").value="YES";
        alert(ans)
       }
    </script>

c#:

protected void Button2_Click1(object sender, EventArgs e)
      {
          bool india = true;
          if (india)
          {
              india = false;
          }
          if(!india)
          {
              ClientScript.RegisterStartupScript(GetType(), "text/javascript", "javascript:GetResult();", true);
              if (HiddenField1.Value == "YES")
              {
                // logic
              }
          }
      }