Warren Blumenow questions

• Why do I get an InvalidCastException when reading values from OdbcDataReader after checking for null values?
• How do I get "Accept" button to fire when DataGridView has focus?
• Why does Graphviz no longer minimise edge lengths when subgraphs are introduced
• Why does closing a nested child dialog also close the parent dialog?
• How can I make a date time picker always contain the last day of the month while showing month and year only?
• How do I rename a table in Oracle so that all foreign keys, constraints, triggers and sequences are updated and any existing data is preserved?

Warren Blumenow answers