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Gets information about all groups in the column direction.
Use this property to retrieve the column grouping structure in the worksheet outline. Each returned IGroupInfo describes a grouped column range and can be used to inspect the group hierarchy or expand and collapse groups.
List<IGroupInfo> ColumnGroupInfo { get; }
ReadOnly Property ColumnGroupInfo As List(Of IGroupInfo)
worksheet.Range["A:D"].Group();
worksheet.Range["A:B"].Group();
IOutline outline = worksheet.Outline;
List<IGroupInfo> groups = outline.ColumnGroupInfo;
IGroupInfo firstGroup = groups[0];