ASP.Net AJAX PageMethod without Success and Failure event handlers example

No,It is not mandatory unitl you get response from server side method.you refer below code.

HTML

<div>
    <asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true">
    </asp:ScriptManager>
    <script type="text/javascript">
        function ShowCurrentTime() {
            PageMethods.GetCurrentTime(document.getElementById("<%=txtUserName.ClientID%>").value);
        }
    </script>
    Your Name :
    <asp:TextBox ID="txtUserName" runat="server"></asp:TextBox>
    <input id="btnGetTime" type="button" value="Show Current Time" onclick="ShowCurrentTime()" />
</div>

C#

[System.Web.Services.WebMethod]
public static void GetCurrentTime(string name)
{
    string abc = "Hello " + name + Environment.NewLine + "The Current Time is: "
        + DateTime.Now.ToString();
}

VB

<System.Web.Services.WebMethod> _
Public Shared Sub GetCurrentTime(name As String)
	Dim abc As String = (Convert.ToString("Hello ") & name) + Environment.NewLine + "The Current Time is: " + DateTime.Now.ToString()
End Sub

Screenshot