April 2002
Intermediate to advanced
416 pages
11h 50m
English
Content preview from Visual Basic® .NET Database Programming
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DataSafe
The DataSafe subroutine, shown in Listing 9.3, returns True if the current data is safe. If the m_DataSet variable is Nothing, then the program has no drawing loaded so there is no data to protect and DataSafe returns True.
If m_DataSet is not Nothing, the function uses the HasChanges method to see if the data has been modified. If the data has not been modified, the data is safe and DataSafe returns True.
If there are unsaved changes, DataSafe asks the user if the program should save the changes. If the user clicks No, then the program is free to discard the changes and DataSafe returns True to indicate that the changes do not need to be saved.
If the user clicks Yes, the function calls subroutine SaveData to save the data. It then ...
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