What do we mean by #id Selector?

Answer:

The jQuery #id selector is nothing but a controlID which uses the id attribute of an HTML tag to find the specific control.It must be unique on a page.
We have to use # sign followd by ControlID yo find control usng jQuery.

Syntax:-
$("#anyControlID")
For Example:-

<asp:Button ID="btnDelete" runat="server" Text="Delete"/>

<asp:Button ID="btnSave" runat="server" Text="Save"/>



$(document).ready(function(){

  $("button").click(function(){

    $("#btnDelete").hide();

  });

});

Here,on clicking of save button,Delete button will be hidden.