How to expose stored procedure with parameters in WCF data service and calling at client side

CREATE PROC [dbo].[GetRolesForUser](@UserID int) as
Select A.id,cast(iif(ISNULL(b.id,0)>0,1,0) as bit)  as IsChecked, A.UserRoleName
From tblRole A LEFT JOIN tblUserRoles B on (A.id=b.RoleId and B.UserID=@UserID)

vmsUri = new Uri("http://localhost:2233/iRentDataService.svc/");
            db = new iRentEntities(vmsUri);
            //var query = db.CreateQuery<GetRolesForUser_Result>("GetRolesForUser")
            //    .AddQueryOption("userid", 6);
            var query = db.Execute<GetRolesForUser_Result>(new Uri(string.Format("{0}GetRolesForUser?userid={1}", db.BaseUri, 6), UriKind.RelativeOrAbsolute));
            GetRolesForUser_Result gc = new GetRolesForUser_Result();

config.SetServiceOperationAccessRule("GetRolesForUser", ServiceOperationRights.All);

<pre lang="xml">

this way i exposed dataservice :


[WebGet]
        public IQueryable&lt;GetRolesForUser_Result&gt; GetRolesForUser(int userid)
        {
            return this.CurrentDataSource.GetRolesForUser(userid).AsQueryable &lt; GetRolesForUser_Result&gt;();
                //.GetRolesForUser(userid).AsQueryable&lt;GetRolesForUser_Result&gt;();


            //return this.CurrentDataSource.GetRolesForUser.where(&quot;it.userid=@userid&quot;, new ObjectParameter(&quot;userid&quot;, userid));
            //.GetRolesForUser(userid)
            //.AsQueryable();
        }
</pre>


The result is coming in browser :
<a href="http://localhost:2233/iRentDataService.svc/GetRolesForUser?userid=6">
how an i call at client side and bind to datagrid ..please help..thanx