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             ºǫ́ :
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            type: "GET",
            cache: false,
            url: "/Role/validateRoleName?rolename="+encodeURIComponent($.trim($("#roleName").val())),
            success: function(result) {
            },
            error: function() {                
            }
        });
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        public JsonResult validateRoleName(string rolename)
        {
            ...
        }
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