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Note: If you maintain cell values in a custom data cache using virtual mode, automatic sizing occurs when the user edits a cell value but does not occur when you alter a cached value outside of a Cell Value Pushed event handler.
In this case, size adjustment occurs whenever cell contents change.
You will typically call the programmatic resizing methods at specific times.
It is also useful to provide initial sizes for user-resizable rows, columns, and headers, and for column fill mode.
Programmatic content-based resizing affects rows, columns, and headers regardless of their visibility.
Automatic sizing does not occur when visibility changes, so changing the column Visible property back to true will not force it to recalculate its size based on its current contents.
The enumerations used by sizing properties and methods have similar values for content-based sizing.
If you configure both rows and columns for content-based automatic sizing and Wrap Mode is enabled, the Data Grid View control will adjust sizes whenever cell contents changed and will use an ideal cell height-to-width ratio when calculating new sizes.
For example, if rows but not columns are configured for automatic sizing and Wrap Mode is enabled, users can drag column dividers to change the width of a column and row heights will automatically adjust so that cell contents are still fully displayed.
Because Not Set restores the value inheritance, the Resizable property will never return a Not Set value unless the row or column has not been added to a Data Grid View control.
Set Resizable to Not Set to restore the inheritance. Column fill mode causes the visible columns in the control to fill the width of the control's display area.