怎样将datatable追加到sql数据库中

Question

C# code

 SqlConnection objconn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["测试数据ConnectionString"].ConnectionString);
string sqlstr = "select * from [aa]";
objconn.Open();
SqlDataAdapter objCmd = new SqlDataAdapter(sqlstr, objconn);
SqlCommandBuilder thisbuilder = new SqlCommandBuilder(objCmd);
objCmd.Update(ds2.Tables[0]);
objconn.Close();

我用上面那个，数据库里面没有导进去，是不是字段的类型可能不一致造成的？