using System.Collections.Generic;

namespace EF_Sample08.DomainClasses
{
    public class Doctor
    {
        public int Id { set; get; }
        public string Name { set; get; }

        public virtual ICollection<Patient> Patients { set; get; }
    }
}

namespace EF_Sample08.DomainClasses
{
    public class Patient
    {
        public int Id { set; get; }
        public string Name { set; get; }

        public virtual Doctor Doctor { set; get; }
    }
}

using System.Data.Entity;
using EF_Sample08.DomainClasses;

namespace EF_Sample08.DataLayer.Context
{
    public class Sample08Context : DbContext
    {
        public DbSet<Doctor> Doctors { set; get; }
        public DbSet<Patient> Patients { set; get; }
    }
}

using System.Data.Entity.Migrations;
using EF_Sample08.DomainClasses;
using System.Collections.Generic;

namespace EF_Sample08.DataLayer.Context
{
    public class Configuration : DbMigrationsConfiguration<Sample08Context>
    {
        public Configuration()
        {
            AutomaticMigrationsEnabled = true;
            AutomaticMigrationDataLossAllowed = true;
        }

        protected override void Seed(Sample08Context context)
        {
            addData(context);
            addSP(context);
            addFn(context);
            base.Seed(context);
        }

        private static void addData(Sample08Context context)
        {
            var patient1 = new Patient { Name = "p1" };
            var patient2 = new Patient { Name = "p2" };
            var doctor1 = new Doctor { Name = "doc1", Patients = new List<Patient> { patient1, patient2 } };
            context.Doctors.Add(doctor1);
        }

        private static void addFn(Sample08Context context)
        {
            context.Database.ExecuteSqlCommand(
                @"IF  EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[FindDoctorPatientsCount]') 
                   AND type in (N'FN', N'IF', N'TF', N'FS', N'FT'))
                      DROP FUNCTION [dbo].[FindDoctorPatientsCount]");
            context.Database.ExecuteSqlCommand(
                @"CREATE FUNCTION FindDoctorPatientsCount(@Doctor_Id INT)
                    RETURNS INT
                    BEGIN
                     RETURN 
                     (
                         SELECT COUNT(*)
                         FROM   Patients
                         WHERE  Doctor_Id = @Doctor_Id
                     );
                    END");
        }

        private static void addSP(Sample08Context context)
        {
            context.Database.ExecuteSqlCommand(
                @"IF  EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[FindDoctorsStartWith]')
                  AND type in (N'P', N'PC'))
                       DROP PROCEDURE [dbo].[FindDoctorsStartWith]
                 ");
            context.Database.ExecuteSqlCommand(
                @"CREATE PROCEDURE FindDoctorsStartWith(@name NVARCHAR(400))
                  AS
                 SELECT *
                 FROM   Doctors
                 WHERE  [Name] LIKE @name + '%'");
        }
    }
}

using System;
using System.Data;
using System.Data.Entity;
using System.Data.Objects.SqlClient;
using System.Data.SqlClient;
using System.Linq;
using EF_Sample08.DataLayer.Context;
using EF_Sample08.DomainClasses;

namespace EF_Sample08
{
    class Program
    {
        static void Main(string[] args)
        {
            Database.SetInitializer(new MigrateDatabaseToLatestVersion<Sample08Context, Configuration>());

            using (var db = new Sample08Context())
            {
                runSp(db);
                runFn(db);
                usingSqlFunctions(db);
            }
        }

        private static void usingSqlFunctions(Sample08Context db)
        {
            var doctorsWithNumericNameList = db.Doctors.Where(x => SqlFunctions.IsNumeric(x.Name) == 1).ToList();
            if (doctorsWithNumericNameList.Any())
            {
                //do something
            }
        }

        private static void runFn(Sample08Context db)
        {
            var doctorIdParameter = new SqlParameter
            {
                ParameterName = "@doctor_id",
                Value = 1,
                SqlDbType = SqlDbType.Int
            };
            var patientsCount = db.Database.SqlQuery<int>("select dbo.FindDoctorPatientsCount(@doctor_id)", doctorIdParameter).FirstOrDefault();
            Console.WriteLine(patientsCount);
        }

        private static void runSp(Sample08Context db)
        {
            var nameParameter = new SqlParameter
            {
                ParameterName = "@name",
                Value = "doc",
                Direction = ParameterDirection.Input,
                SqlDbType = SqlDbType.NVarChar
            };
            var doctors = db.Database.SqlQuery<Doctor>("exec FindDoctorsStartWith @name", nameParameter).ToList();
            if (doctors.Any())
            {
                foreach (var item in doctors)
                {
                    Console.WriteLine(item.Name);
                }
            }
        }
    }
}

db.Database.SqlQuery<Doctor>("exec FindDoctorsStartWith "+ txtName.Text, nameParameter).ToList()