link in asp.net mvc

It is straight-forward. You can use jQuery to display the link dynamically.

$(document).ready(function(){
//attach with the id od deductions
$('#txtTotalDeductions').change(function (){
if($(this).val() == "") //Check blank
{
$('#lnkBack').removeAttr('href');
}
else
{
$('#lnkBack').attr('href', "http://www.c-sharpcorner.com/forums/link-in-asp-net-mvc");
}
});
});

Note: txtTotalDeductions is id attribute of search box. lnkBack is id of HREF link.

http://www.spiceforms.com/blog/disable-hyperlink-using-jquery-3-techniques/