How to use transaction is this case..

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Ok so i have a webform and 5 FileUpload control..a user can upoad any number of files from 1 to 5 but if anyone of the files does not get uploaded then i want to rollback everything...
For ex:
if user has selected 4 files and if something unexpected occurs at 4th then i want to remove or rollback all the previous 3 file uploads..

dboperation dbinsert=new dboperation();

C#

if (file1.ContentLength > 0)
{
      .......
      .......
dbo.insert(bytes, lastid, file2.FileName);
}

C#

if (file2.ContentLength > 0)
{
      .......
      .......
dbo.insert(bytes, lastid, file2.FileName);
}

C#

if (file3.ContentLength > 0)
{
      .......
      .......
dbo.insert(bytes, lastid, file2.FileName);
}

//......till file5

dboperation is a class in c# file and dbinsert is a method which is executing an insert stored procedure.

Posted 26-Aug-13 23:47pm

arbaaz jalil

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MTProgrammer · Answer 1 · 2013-08-28T10:59:00

Solution 1

Check this out, explains it very well.

http://stackoverflow.com/questions/2912112/c-sharp-rollback-sqltransaction-in-catch-block-problem-with-object-accessabi

Posted 28-Aug-13 10:59am

MTProgrammer

Ajay J Singh · Answer 2 · 2013-08-28T17:26:00

Use SqlTransaction Object in the beginning of Connection open
and pass that transaction object in each SqlCommand object.

And by using Commit() or Rollback() Method you can decide the whether to save the changes or not.

C#

using (var Conn = new SqlConnection(_ConnectionString))
{
    SqlTransaction trans = null;
    try
    {
        Conn.Open();
        trans = Conn.BeginTransaction();

        using (SqlCommand Com = new SqlCommand(ComText, Conn, trans))
        {
            /* DB work */
        }
        trans.Commit();
    }
    catch (Exception Ex)
    {
        if (trans != null) trans.Rollback();
        return -1;
    }
}