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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.
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.
If content-based automatic sizing is enabled for one dimension only—that is, for rows but not columns, or for columns but not rows—and Wrap Mode is also enabled, size adjustment also occurs whenever the other dimension changes.
In this case, call the Update Cell Value method to force the control to update the cell display and apply the current automatic sizing modes.
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.
For more information about this mode, see the Column Fill Mode section below. With these values, you can limit which cells are used to calculate the preferred sizes. The enumerations used by sizing properties and methods have similar values for content-based sizing. For maximum performance, use programmatic resizing instead so that you can resize at specific times, such as immediately after new data is loaded. To avoid performance penalties, use the automatic sizing modes that calculate sizes based only on the displayed rows rather than analyzing every row in the control.