C#

OleDbCommand command = new OleDbCommand(sql, connection);
OleDbParameter retval = command.Parameters.Add("ReturnValue", OleDbType.Integer);
retval.Direction = ParameterDirection.ReturnValue;
command.ExecuteNonQuery();
int returnValue = (int)retval.Value;

if (<condition>)
{
 // do work here
}
else
{
 // cancel work here
}

bool success = false;

do { 

success = DoWork1();
if (!success)
   break;

success = DoWork2();
if (!success)
   break;

...

success = true;
// The argument in the while is 'false'. It's not a mistake this is the idea.
}while(false); 

if (!success)
{
  // Do rollback
}

bool success = true;
success = success && DoWork1(); 
success = success && DoWork2(); 

if (!success)
{
  // Do rollback
}