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SqlConnection cn;
SqlTransaction st;


SqlConnection cn;
SqlTransaction st=new SqlTransaction();

Is it similar?

What I have tried:

I had searched on google but not understand and confused.

private void btbsend_Click(object sender, EventArgs e)
                MySqlCommand genvoucher,df;
                MySqlTransaction genvouchrt=new MySqlTransaction();
                MySqlTransaction dft = new MySqlTransaction();

                    string fvno;
                    dateTimePicker1.Value = DateTime.Now;
                    dateTimePicker2.Value = DateTime.Now;
                    var tdat = dateTimePicker2.Value;
                    var ttime = dateTimePicker1.Value;
                    fvno = textBox1.Text;
                    genvoucher = new MySqlCommand("insert into cutting(vno,bno,nsize,machine,vdate,operator,stime,shift,status) values(@vno,@bno,@size,@machine,@date,@opt,@start,@shift,@status)", cn, genvouchrt);
                    genvoucher.Parameters.AddWithValue("@vno", fvno);
                    genvoucher.Parameters.AddWithValue("@size", textBox3.Text);
                    genvoucher.Parameters.AddWithValue("@bno", comboBox3.SelectedItem.ToString());
                    genvoucher.Parameters.AddWithValue("@machine", comboBox1.SelectedItem.ToString());
                    genvoucher.Parameters.AddWithValue("@date", tdat);
                    genvoucher.Parameters.AddWithValue("@opt", comboBox4.SelectedItem.ToString());
                    genvoucher.Parameters.AddWithValue("@shift", shift);
                    genvoucher.Parameters.AddWithValue("@start", ttime);
                    genvoucher.Parameters.AddWithValue("@status", "Open");

                    df = new MySqlCommand("insert into vouchers values(@vno,@dept,@shift,@task,@stats,@remarkn,@remarkv)", cn, dft);
                    df.Parameters.AddWithValue("@vno", textBox1.Text);
                    df.Parameters.AddWithValue("@dept", dept);
                    df.Parameters.AddWithValue("@shift", shift);
                    df.Parameters.AddWithValue("@task", "Cutting");
                    df.Parameters.AddWithValue("@stats", "Open");
                    df.Parameters.AddWithValue("@remarkn", "");
                    df.Parameters.AddWithValue("@remarkv", "");

                    MessageBox.Show("Voucher Opened Successfully!");

            catch (Exception eli)
                MessageBox.Show("Can't Generate Voucher" + Environment.NewLine + eli);
                catch(Exception ex)
                    MessageBox.Show("Rollback Exception"+ex.Message);
Updated 16-Sep-17 23:20pm
Graeme_Grant 17-Sep-17 0:32am    
What is your question? Be specific: this is what I am currently doing; this is the code that I am using; this is the error that I have encountered; etc...
[no name] 17-Sep-17 0:35am    
my question is if i use second part is it wrong?
Graeme_Grant 17-Sep-17 0:40am    
This information NEEDS TO BE in your question. That is why it is called a "Question".

Also, hit "reply" to the comment that you want to "reply to", not "Have a question or Comment". This way the author will know that you are communicating with them. You have already asked 15+ questions, so you should know this already.
[no name] 17-Sep-17 0:39am    
i have updated my question and added code.
Graeme_Grant 17-Sep-17 0:41am    
see answer below.

It is unclear what you want. GOOGLE SEARCH is your friend. So, here are a couple of documentation links, found with GOOGLE SEARCH, that also include code examples:
* SqlTransaction Class (System.Data.SqlClient)[^]
* Transaction and Bulk Copy Operations | Microsoft Docs[^]

Here is a tutorial found right here on CodeProject:
* A Beginner's Tutorial for Understanding Transactions and TransactionScope in ADO.NET[^]

And a GOOGLE SEARCH for more tutorials: SqlTransaction beginner examples C#[^]
Share this answer
Wendelius 17-Sep-17 6:24am    
Good links!
You asked if the following are similar:
SqlConnection cn;
SqlTransaction st;

SqlConnection cn;
SqlTransaction st=new SqlTransaction();

However, the question does not quite make sense since the latter one does not compile. In other words, you cannot instantiate a SqlTransaction class directly. This is because the constructor is defined as internal.

If you try to compile the latter code you'll get an error
Severity Code   Description
-------- ------ ----------------------------------------------------------------------
Error    CS1729 'SqlTransaction' does not contain a constructor that takes 0 arguments	

Probably the reason for preventing direct instantiation of SqlTransaction class is that during BeginTransaction call, several checks are carried out and assignments made, for example:
- default isolation level is set to read committed if not specified
- connection is validated
- the connection is restored if needed and broken
- and so on...
Share this answer
Graeme_Grant 17-Sep-17 4:29am    
The code was added after I posted my solution. Well done for answering the coding problem. 5'd :)
[no name] 17-Sep-17 5:09am    
really worthy answer.
Wendelius 17-Sep-17 6:22am    
Thank you.
Wendelius 17-Sep-17 6:22am    

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