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Protect a sheet from deleting columns

Feb 19, 2015 at 7:50 AM
I made a C# Windows Forms Application that creates an excel file.
Depending on what fields the user selects in the form, the columns representing those fields are made visible, so that the user can start to fill in his data in the columns he needs.
This works fine, however users should not be able to delete columns !
If the order of columns is changed, the data from the user will not be converted correctly...