//if no exist create datebase SQLSUGAR4XTEST (bin/database/)
db.DbMaintenance.CreateDatabase();

public class CodeFirstTable1
{
        [SugarColumn(IsIdentity = true, IsPrimaryKey = true)]
        public int Id { get; set; }
        public string Name { get; set; }
        [SugarColumn(ColumnDataType = "Nvarchar(255)")]//custom
        public string Text { get; set; }
        [SugarColumn(IsNullable = true)]
        public DateTime CreateTime { get; set; }
}

db.CodeFirst.InitTables(typeof(CodeFirstTable1));//Create table

[SugarColumn( OldColumnName ="Name")]
public string  NewName { get; set; }

[SqlSugar.SugarColumn(IndexGroupNameList = new string[] { "index1" })]
public int V1 { get; set; }
[SqlSugar.SugarColumn(IndexGroupNameList =new string[] { "index1" } )]
public DateTime? V2 { get; set; }

db.CodeFirst.InitTables(typeof(CodeFirstTable));

[SugarTable("CodeFirstTable2",TableDescription = "TableDescription")]
public class CodeFirstTable
{
   [SugarColumn(IsPrimaryKey = true)]
   public Guid Id { get; set; }
}