How I do url tag in $.ajax to call server side event through a jquery function in asp.net

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C#

//my code
function ShowCurrentTime() {
$.ajax({
type: "POST",
url: "../forms/WebForm1.aspx/showTime", // this line of code does not work
data: "{}",
contentType: "application/json; charset=ut f-8",
dataType: "json",
success: OnSuccess,
failure: function (response) {
alert(response.d);
}
});
alert("success");
}