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Whereas the DataGrid.BackColor property determines the color of rows in the grid, the DataGrid.BackgroundColor determines the color of the nonrow area, which is only visible when the grid is scrolled to the bottom, or if only a few rows are contained in the grid.
By default, both the DataGrid.BackColor and the DataGrid.AlternatingBackColor properties are set to the same color. Setting the DataGrid.BackColor property affects only even-numbered rows, while setting the DataGrid.AlternatingBackColor affects only odd-numbered rows.