ASP.NET

<ajaxToolkit:ToolkitScriptManager runat="server" ID="ScriptManager1" EnablePageMethods="true">
   <Scripts>
      <asp:ScriptReference Path="~/javascript/myscript.js" />
   </Scripts>
</ajaxToolkit:ToolkitScriptManager>
...
...
<a href="javascript:myFunction();">Click to run script</a>
...
...
<div id='theDiv'></div>

[System.Web.Services.WebMethod]
public static string ReturnTheString()
{
   return "This is the string returned";
}

function myFunction()
{
   PageMethods.ReturnTheString(OnSucceeded, OnFailed);
}

function OnSucceeded(result)
{
   var myDiv = document.getElementById('theDiv');
   myDiv.innerHTML = result;
}

function OnFailed(error)
{
   alert(error.get_message());
}

 <br />
<br />
protected void Button1_Click1(object sender, EventArgs e)<br />
    {<br />
       <br />
<br />
        // Save off previous answers<br />
        System.Data.DataRowView dr = (System.Data.DataRowView)DetailsView1.DataItem;<br />
<br />
        // Create Answer object to save values<br />
        Answer a = new Answer();<br />
        a.QuestionID = dr["QuestionID"].ToString();<br />
        a.CorrectAnswer = dr["CorrectAnswer"].ToString();<br />
<br />
        if (RadioButton1.Checked == true)<br />
        {<br />
            crropt = "option1";<br />
        }<br />
        else if (RadioButton2.Checked == true)<br />
        {<br />
            crropt = "option2";<br />
        }<br />
        else if (RadioButton3.Checked == true)<br />
        {<br />
            crropt = "option3";<br />
        }<br />
        else if (RadioButton4.Checked == true)<br />
        {<br />
            crropt = "option4";<br />
        }<br />
        a.UserAnswer = crropt;<br />
<br />
        ArrayList al = (ArrayList)Session["AnswerList"];<br />
        al.Add(a);<br />
<br />
        Session.Add("AnswerList", al);<br />
<br />
        if (DetailsView1.PageIndex == DetailsView1.PageCount - 1)<br />
        {<br />
            // Go to evaluate answers<br />
            Response.Redirect("evaluate.aspx");<br />
        }<br />
        else<br />
        {<br />
            DetailsView1.PageIndex++;<br />
            Button1.Text = "Finished";<br />
        }<br />