public static class MigrationHelper
{
    /// 
    /// This SQL Server-Specific method creates a Timestamp column.
    /// 
    /// 
    /// 
     public static void AddConcurrencyChecking(ITransformationProvider database, string tableName)
    {
          string addTimestampQuery = "ALTER TABLE " + tableName + " ADD timestamp TIMESTAMP NOT NULL;";
          IDbCommand cmd = database.GetCommand();
          cmd.Connection.Open();
          database.ExecuteNonQuery(addTimestampQuery);
          cmd.Connection.Close();         
    }
     public static void AddTimeStamps(ITransformationProvider database, string tableName)
    {
            AddColumn(database, tableName, "created_at", DbType.DateTime);
            AddColumn(database, tableName, "updated_at", DbType.DateTime);
    }
     public static void AddUserStamps(ITransformationProvider database, string tableName)
    {
          AddColumn(database, tableName, "created_by", DbType.Int32);
          AddColumn(database, tableName, "updated_by", DbType.Int32);
    }
     private static void AddColumn(ITransformationProvider database, string tableName, string columnName, DbType dbType)
    {
          database.AddColumn(tableName, new Migrator.Framework.Column(columnName,dbType));
    }
}