用c# 将sql server数据库数据迁移到access数据库

public void hexinchuli(string riqi)
{

//链接到sql server数据库，将需要数据迁移到access数据库相应的表
string sqlserver = "Server =server;DataBase=database;Uid=sa;Pwd=123456";
string Access = "Provider = Microsoft.Jet.OleDb.4.0;Data Source = E://mymymy//backfile//" + riqi + ".mdb";
DataSet sqlds = new DataSet();
SqlConnection sqlconn = new SqlConnection(sqlserver);
sqlconn.Open();
System.IO.StringWriter sqlXML = new System.IO.StringWriter();
try
{
SqlDataAdapter mycommand = new SqlDataAdapter("select * frombiao where syrp='"+riqi+"'", sqlconn);
mycommand.Fill(sqlds, "biao");

sqlds.WriteXml(sqlXML);
System.Xml.XmlDocument doc = new System.Xml.XmlDocument();
doc.LoadXml(sqlXML.ToString());
doc.Save("e://mymymy//dd.xml");
}
catch (Exception ex)
{
shengcheng.WriteToFile(ex.ToString());
}
sqlconn.Close();
OleDbConnection oleconn = new OleDbConnection(Access);
oleconn.Open();
System.IO.StringWriter oleXML = new System.IO.StringWriter();
try
{
OleDbDataAdapter olecomm = new OleDbDataAdapter("select * from biao", oleconn);
DataSet oleds = new DataSet();
OleDbCommandBuilder cb = new OleDbCommandBuilder(olecomm);
oleds.ReadXml("e://mymymy//dd.xml");
oleds.WriteXml(oleXML);
olecomm.Update(oleds, "biao");
oleds.AcceptChanges();
System.IO.File.Delete("e://mymymy//dd.xml");
}
catch (Exception ex)
{
shengcheng.WriteToFile(ex.ToString());
}
oleconn.Close();

}