You need to call the Open method somewhere for it to actually work. However, the Open method is incorrect. You unbinding the click event which won't cause the dialog to be displayed when the button is clicked
$(document).ready(function()
{
$("#Linkbutton").click(function()
{
$("#div").modal(
{ persist: true,
maxheight:500,
autoResize:true,
onClose: function(dialog){}
}
});
});
Or
<asp:LinkButton ID="Linkbutton" onClientClick="Open()" runat="server">Clik</asp:LinkButton>
function Open()
{
$("#div").modal(
{ persist: true,
maxheight:500,
autoResize:true,
onClose: function(dialog){}
}
}