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You can customize sizing behaviors when working with derived Data Grid View cell, row, and column types by overriding the Data Grid View Cell. The protected resizing method overloads are designed to work in pairs to achieve an ideal cell height-to-width ratio, avoiding overly wide or tall cells. For example, you might programmatically resize all columns immediately after loading data, or you might programmatically resize a specific row after a particular cell value has been modified. Get Preferred Width() methods or by calling protected resizing method overloads in a derived Data Grid View control. 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. 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 example, if a column is hidden after it is automatically sized to fit a large cell value, the hidden column will not change its size if the row containing the large cell value is deleted. Content-based automatic sizing modes do not affect rows, columns, or headers that you have hidden by setting the row or column Visible property or the control Row Headers Visible or Column Headers Visible properties to false.
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.
Column fill mode causes the visible columns in the control to fill the width of the control's display area.
There are two kinds of automatic sizing in the Data Grid View control: column fill mode and content-based automatic sizing.
If the State value includes the Resizable Set flag, the Resizable property value is not inherited.
If you need to determine whether the Resizable property value of a row or column is inherited, examine its State property.
Programmatic resizing is useful to avoid performance penalties with continuous resizing.