SQL的事务处理

SqlTransaction st;
SqlConnection con;
SqlCommand cmdUpdateA;
SqlCommand cmdUpdateB;
con=new SqlConnection("Server=.;database=gggcorn;uid=sa;pwd=");
cmdUpdateA=new SqlCommand("update data set Datas='"+this.TextBox3.Text+"'where ID=1 ",con);
cmdUpdateB=new SqlCommand("update data set Datas='"+this.TextBox3.Text+"'where ID=2 ",con);
con.Open();
st=con.BeginTransaction();
cmdUpdateA.Transaction=st;
cmdUpdateB.Transaction=st;
try
{
cmdUpdateA.ExecuteNonQuery();
cmdUpdateB.ExecuteNonQuery();
st.Commit();
this.Response.Write("<script>alert('success');</script>");
}
catch(Exception ex)
{
st.Rollback();
this.Response.Write("<script>alert('fail');</script>");
}
finally
{
con.Close();
}