Connecting SQL data from MVCapplication without EF

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string connectionString = "Server=KCPC\\SQLEXPRESS;Database=Optician;User ID=sa;Password=123456;Trusted_Connection=False";

             SqlConnection cnn = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = cnn;
            cmd.CommandType = System.Data.CommandType.StoredProcedure;
            cmd.CommandText = "spPatientList";
            cnn.Open();
            SqlDataReader data = cmd.ExecuteReader();
            while (data.Read())
            {
                string sd = data["PatientCode"].ToString();
            }
            cnn.Close();

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