/////ado.net1.0中使用Transacation（事务)
string connectionString = "database=Northwind;pwd=admin;uid=sa;server=DATABASE-VPC\\SQL2005";
using (SqlConnection conn = new SqlConnection(connectionString))
{
  conn.Open();
  SqlTransaction transaction = conn.BeginTransaction();
  try
  {
   using (SqlCommand cmd = new SqlCommand())
   {
    cmd.Connection = conn;
    cmd.CommandType = CommandType.Text;
    cmd.CommandText = "";
    cmd.Transaction = transaction;
    cmd.ExecuteNonQuery();
    transaction.Commit();//提交事务
   }
  }
  catch
  {
   transaction.Rollback();//事务回滚
  }
/////2.0中使用事务
string connectionString = "database=Northwind;pwd=admin;uid=sa;server=DATABASE-VPC\\SQL2005";
string connectionStringTwo = "database=Test;pwd=admin;uid=sa;server=DATABASE-VPC\\SQL2005";
using (TransactionScope transaction = new TransactionScope())//使用事务
{
  try
  {
   using (SqlConnection conn = new SqlConnection(connectionString))
   {
    using (SqlCommand cmd = new SqlCommand())
    {
     cmd.CommandText = "insert into [member] (name) values ('test')";
     cmd.CommandType = CommandType.Text;
     cmd.Connection = conn;
     conn.Open();
     cmd.ExecuteNonQuery();
    }
   }
   using (SqlConnection conn = new SqlConnection(connectionStringTwo))
   {
    using (SqlCommand cmd = new SqlCommand())
    {
     cmd.CommandText = "insert into [member] (name) values ('test')";
     cmd.CommandType = CommandType.Text;
     cmd.Connection = conn;
     conn.Open();
     cmd.ExecuteNonQuery();
    }
   }
   transaction.Complete();//就这句就可以了。
  }
  catch (Exception ex) { MessageBox.Show(ex.Message); }
}