output of function

hi,i have a faunction like this:

[WebMethod]
        public bool setstatus(int bid)
        {
            Models.mBlockTextContext ctx = new mBlockTextContext();
            var bselect = (from b in ctx.mBlocksLists
                           where b.BlockID == bid
                           select b).FirstOrDefault();

            if (bselect != null)
            {
                bselect.BlockStatus = !bselect.BlockStatus;
                ctx.SaveChanges();
                return bselect.BlockStatus;
            }
            return false;
        }

this is in my webservice
i have a button,i want to write the code,that when button is clicked,some string will be printed on page with ajax

how can i do?