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Gets or sets the color of the frozen line.
This property returns the color used to display the divider between frozen and unfrozen panes.
If no frozen line color has been set, this property returns null.
Color FrozenLineColor { get; set; }
Property FrozenLineColor As Color
worksheet.FreezePanes(2, 1);
worksheet.FrozenLineColor = Color.Red;
Color frozenLineColor = worksheet.FrozenLineColor;