Gets the cell border style for the System.Windows.Forms.DataGridView.
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If the DataGridView.CellBorderStyle property is set to anything other than DataGridViewCellBorderStyle.Single, DataGridViewCellBorderStyle.SingleHorizontal, or DataGridViewCellBorderStyle.SingleVertical, the DataGridView.GridColor property must be a system color.
You cannot set this property to the DataGridViewCellBorderStyle.Custom value, which is a read-only value indicating that the cell border style has been customized through the use of the DataGridView.AdvancedCellBorderStyle property.