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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.
How can I force all the cells to validate in a datagrid in a c# winform application when a Tool Strip Button is pressed?
I have individual cell validation working when the user edits the cell it calls my cell validating event.
For more information about implementing virtual mode to manage read/write data with a row-level commit scope, see Walkthrough: Implementing Virtual Mode in the Windows Forms Data Grid View Control.
Call the Update Row Height Info method when changing the cached row height information outside of a Row Height Info Pushed event handler to ensure that the current value is used in the display of the control.
If your data is read-only, the event may be the only event you will need to handle.
Additional virtual-mode events let you enable specific functionality like user edits, row addition and deletion, and row-level transactions.
Call the Update Cell Value method when changing a cached value outside of a Cell Value Pushed event handler to ensure that the current value is displayed in the control and to apply any automatic sizing modes currently in effect..
Call the Update Cell Error Text method or the Update Row Error Text method when you change the cell or row error text to ensure that the current value is displayed in the control.
With these values, you can limit which cells are used to calculate the preferred sizes.