ASP.Net LinkButton Prevent Postback Not Working - JavaScript -

i know how prevent javscript within href attribute firing evident in jsfiddle (http://jsfiddle.net/mkarr/knefk/)

however, when logic applied asp.net linkbutton such:

<asp:linkbutton id="btnsubmit" runat="server" text="submit" onclientclick="return formtest.validate(event);" onclick="btnsubmit_click"></asp:linkbutton> 

which translates to:

<a onclick="return formtest.validate(event);" id="ctl00_m_g_87932399_e546_4e12_8297_982b811d8cea_ctl00_btnsubmit" href="javascript:webform_dopostbackwithoptions('blah blah blah')">submit</a> 

the formtest.validate() method execute correctly , returns false, webform_dopostbackwithoptions fired after!

can see flaws in logic cannot??

edit:

also, several stack overflow solutions have been accepted issue of them doing virtually have done leading me believe i'm missing simple!

• disable postback on <asp:linkbutton>
• prevent linkbutton post onclientclick not working. why?

answer:

since cannot answer own question because i'm not reputable yet (lol), here's edit answer:

going off @qbm5's original tip of not using asp.net controls, solve problem, although still not know why initial problem occurred in first place (does when comes asp.net? turn off, on comes mind here) :o)

i replaced linkbutton asp.net control following:

<input type="submit" value="submit" id="btnsubmitbutton" runat="server" onserverclick="btnsubmitbutton_click" class="submitbtn" /> 

i bound .submitbtn's click event via jquery:

$('.submitbtn').on('click', function (e) {     if (!instance.validate()) {         e.preventdefault();     } }); 

the trick use onserverclick , runat="server" on control getting away linkbutton goal , postback behavior different.

which translates this:

<input onclick="if (typeof(page_clientvalidate) == 'function') page_clientvalidate(''); "  type="submit" id="ctl00_m_g_87932399_e546_4e12_8297_982b811d8cea_ctl00_btnsubmitbutton" value="submit" class="submitbtn"> 

anyone want take stab @ root cause? need move foward don't have time. :o)