ADO.NET :: SqlCommand.Transaction Object "lost" During SqlException?
Aug 16, 2010
I've been stuck with this for days, and posted elsewhere online without success. If anyone can provide me with an answer to this problem I will arrange for beer to be sent to your chosen address....I have a DataTable containing multiple rows of data that I want to insert into a SQL 2005 table. The code works perfectly when the DataTable contains values that meet the SQL table schema design (e.g. all rows have a username, password, firstname & surname). However, when a value is missing or incorrectly entered (e.g. no firstname value), this causes a SqlException. I need to handle this in ASP.NET to provide a more user-friendly error message than what SQL gives, then rollback the whole transaction to cancel the transaction.The code attached is an imitation of how my data layer works. The error occurs on the
RollBack() method. The error is: 'Object reference not set to an instance of an object'Can anyone explain why this happens? The SqlCommand object seems okay when I debug (it exists), but the
Transaction object is lost as soon as the SqlException occurs. Although the transaction never commits when a SqlException is thrown, its a pretty ugly exit.My code design might be poor, in which I would welcome advice, but most important I need to figure out how to trap SqlExceptions without this error occuring, and Rollback as needed.The SqlException Numbers thrown are 2601 or 2627, both of which carry a severity level of
14, which is not high enough for the SqlCommand object to close the connection according to MSDN.The code looks lengthy but should be simple to follow...
[Code]....
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[Code]....
is used for update, insert and delete operations.Besides the fact
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