use asp button in modal popup jquery

<div id="loginModal">

LOGIN FORM

<asp:Button ID="psearch" runat="server" onclick="usearch_Click" Text="LOG IN" />
</div>

the above is shown as popup using jquery as

$('#loginModal').modal();


and i have function in aspx.cs as

protected void usearch_Click(object sender, EventArgs e)
{
}

but that is not getting called when LOG IN clicked