How to use where clause (Pass parameter value) in MiniJSON

I have 2 array names called categories and products and i'm getting the values from products table but i want to pass the id value from categories to products using WHERE clause. But how can i use WHERE in MiniJSON?

{"Categories":[{"id":"1","name":"Test1"},{"id":"2","name":"Test2"},}],

      "Products":
      [{"name":"Test2","category_id":"2","imageurl":"http://ift.tt/1CnaxtO"},
      {"name":"Test1","category_id":"1","imageurl":"http://ift.tt/1Ho2sDr"},]}


     IList linksObject = (IList) search["Products"]

          foreach (IDictionary ProductslinksArray in linksObject) {

           String modal3d=string.Format("{0} ", ProductslinksArray["imageurl"]); 

              //Here i need to pass the id value from categories  to products WHERE category_id=? (id value )   How can i use WHERE clause?

 I have tried below

 String cat_id=string.Format("{0} ", modellinksArray["category_id"]);

 String modal3d=string.Format("{0} ", modellinksArray["imageurl"] as cat_id["1"]);

     }