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POTransaction not rolling back in c#
 

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    <pre><code>private void btnConfigure_Click(object sender, EventArgs e) { try { dbConfigure dc = new dbConfigure(); SqlTransaction tr = conn.BeginTransaction(); cmd.Transaction = tr; if (dc.configuration(cmd, ps.tableNames)) tr.Commit(); else { tr.Rollback(); mesg.show("Transaction is Rolled back"); } } catch (Exception ex) { mesg.show(ex.Message); } } </code></pre> <p>If i get problem anywhere in <code>configuration</code> method then it returns me false and I can see the message <code>Transaction is Rolled Back</code>. But actually transaction is not rolled back completely and some changes in database structure made by this function stay there inspite of rollback which is quite undesired. My Question is <strong>What can be the possibility of malfunctioning of Transaction roll back?</strong> </p> <p>I have nowhere else any transaction in my project except the shared (above) method</p> <p><strong>Little Details</strong></p> <p>I am calling a very lengthy/complex function <code>configuration</code> of my class <code>dbConfigure</code>. It makes some required changes in database strucure. e.g. It</p> <ol> <li>Drops foriegnKeys</li> <li>Drops Primary keys</li> <li><p>Drops auto-increment fields</p> <p>It saves these keys before dropping and recreates in desired order/position</p></li> </ol> <p><code>conn</code> is an <code>SqlConnection</code> which is already opened, I use no connection anywhere other than this</p> <p><code>cmd</code> is <code>conn.CreateCommand()</code> I use no command anywhere other than this</p> <p>I never close the connection in this whole process, however SqlDataReader's are closed in <code>configuration</code> function when they do their job.</p>
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    1. COThanks a lot @Morten Jacobsen. I did not think that way. So I got my answer. But could you please guide also if there is any way to do that? Mean roll back a create table if another create table after it fails?
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    2. COYes @GeorgeStocker. Although link you told does not seem much helpful to solve my problem. However I am happy I have learned something by this question. Best answer could be to help me to find a way to roll back structural changes in database. But at least your comment gives bit guidance and some motivation to do that. You can post it as answer and surely I am going to accept it if I do not find the better one. Because it is valid answer
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    3. COI have deleted my previous comment, since as Remus Rusanu pointed out, it is actually possible to do transactional DDL in SQL Server. My comment was based on Oracle databases where it is not possible.
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