, c#, textbox

<input class="span3" runat="server" id="email" name="email" placeholder="Email" type="text">                                                  

in code behind, how to capture the value from above codes in the front end?
I have button in for the click event.

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käµfm³d 👽Commented:
string value = Request.Params["email"];  // whatever the "name" attribute of your target control is

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Front end? In JavaScript?
var ctl = document.getElementById('<%=email.ClientID%>');

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Request.Form["email"] in the server side and document.getElementById('<%=email.ClientID%>'); in client side or by using jquery $("#email").val()
For jquery, it will still need the ClientID

var ctl =  $('#<%=email.ClientID%>');

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