Rebuilding EF Providers for EF6
Updating Applications to use EF6
EF Tools: adding EF6 support & enabling out-of-band releases
Async Query and Save
Connection Resiliency
Code-Based Configuration 
Dependency Resolution
Interception/SQL logging
Custom implementations of Equals or GetHashCode on entity classes
Custom Code First Conventions
Code First Mapping to Insert/Update/Delete Stored Procedures
Configurable Migrations History Table
Multiple Contexts per Database

  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlCeConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="System.Data.SqlServerCe.4.0" />
      </parameters>
    </defaultConnectionFactory>
    <providers>
      <provider invariantName="System.Data.SqlServerCe.4.0" type="System.Data.Entity.SqlServerCompact.SqlCeProviderServices, EntityFramework.SqlServerCompact" />
    </providers>
  </entityFramework>

Update-Package EntityFramework

<!-- 1. Change in <configuration><configSections> -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=4.4.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
<!-- 2. Add in <entityFramework><providers> -->
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />

PM> Install-Package EntityFramework.SqlServerCompact

نکته مهم: بدیهی است که تغییرات زیر، ORM شما را تنها به sql server مقید می‌کند که بعدها در صورت تغییر دیتابیس نیاز به حذف موارد زیر را خواهید داشت؛ در غیر اینصورت به مشکل عدم ایجاد دیتابیس برخواهید خورد.

        public DateTime BirthDate { get; set; }
        public DateTime HireDate { get; set; }
        public DateTime? LeaveDate { get; set; }

          [Column(TypeName = "date")]
        public DateTime BirthDate { get; set; }

        [Column(TypeName = "date")]
        public DateTime HireDate { get; set; }

        [Column(TypeName = "date")]
        public DateTime? LeaveDate { get; set; }

     public class Testtypes
    {
           public TimeSpan CloseTime { get; set; }
            public TimeSpan CloseTime2 { get; set; }
    }
   public class TestConfig : EntityTypeConfiguration<Testtypes>
    {
        public TestConfig()
        {
            this.Property(x => x.CloseTime2).HasPrecision(3);
        }
    }

float flExample=23.2f;

//real
public float FloatData { get; set; }
//real
public Single SingleData { get; set; }
//float
public double DoubleData { get; set; }

4235.254

modelBuilder.Entity<Class>().Property(object => object.property).HasPrecision(7, 3);

     public class Testtypes
    {
        public Decimal Decimal1 { get; set; }
        public Decimal Decimal2 { get; set; }

     }

 public class TestConfig : EntityTypeConfiguration<Testtypes>
    {
        public TestConfig()
        {
            this.Property(x => x.Decimal2).HasPrecision(7, 3);
        }
    }

[StringLength(25)]
public string FirstName { get; set; }

[StringLength(30)]
[Column(TypeName = "varchar")]
public string EnProductTitle { get; set; }


public string ArticleContent { get; set; }
[Column(TypeName = "varchar(max)")]
public string ArticleContentEn { get; set; }

this.Property(e => e.EnProductTitle).HasColumnType("VARCHAR").HasMaxLength(30);

modelBuilder.Properties<string>().Configure(c => c.HasColumnType("varchar"));


//=========== یا

modelBuilder.Properties<string>().Configure(c => c.IsUnicode(false));

//tinyInt
public byte Age { get; set; }

//smallInt
public Int16 OldInt { get; set; }

//int
public int Int32 { get; set; }

//Bigint
public Int64 HighNumbers { get; set; }

CREATE TABLE MyTable
(
      ID int identity Primary key,
      Name char(100),
      Email char(100)
)
WITH (DATA_COMPRESSION = Row);

GO

Alter TABLE MyTable REBUILD WITH (DATA_COMPRESSION=Row, MAXDOP=2);

CREATE TABLE MyTable
(
      ID int identity Primary key,
      Name char(100),
      Email char(100)
)
WITH (DATA_COMPRESSION = Page);

Alter TABLE MyTable REBUILD WITH (DATA_COMPRESSION=Page, MAXDOP=2);

-- بررسی اینکه چه میزان فضا با اعمال فشرده سازی صفحات قابل صرفه جویی خواهد بود
EXEC sp_estimate_data_compression_savings 'schemaname', 'TableName', NULL, NULL, 'PAGE';

-- بررسی اینکه چه میزان فضا با اعمال فشرده سازی ردیف‌ها قابل صرفه جویی خواهد بود
EXEC sp_estimate_data_compression_savings 'schemaname', 'TableName', NULL, NULL, 'ROW';

USE dbName;
SELECT objectname = OBJECT_NAME(s.object_id),
      indexname = i.name,
      i.index_id,
      reads = range_scan_count + singleton_lookup_count,
      'leaf_writes' = leaf_insert_count + leaf_update_count + leaf_delete_count,
      'leaf_page_splits' = leaf_allocation_count,
      'nonleaf_writes' = nonleaf_insert_count + nonleaf_update_count +
      nonleaf_delete_count,
      'nonleaf_page_splits' = nonleaf_allocation_count
FROM   sys.dm_db_index_operational_stats (DB_ID(), NULL, NULL, NULL) AS s
      INNER JOIN sys.indexes AS i
           ON  i.object_id = s.object_id
WHERE  OBJECTPROPERTY(s.object_id, 'IsUserTable') = 1
      AND i.index_id = s.index_id
ORDER BY
      leaf_writes DESC,
      nonleaf_writes DESC