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Gets or sets the auto merge direction.
AutoMergeDirection Direction { get; set; }
Property Direction As AutoMergeDirection
worksheet.AutoMerge(worksheet.Range["A1:A4"], AutoMergeDirection.Column);
IAutoMergeRangeInfo mergeInfo = worksheet.AutoMergeRangesInfo[0];
mergeInfo.Direction = AutoMergeDirection.Row;
AutoMergeDirection direction = mergeInfo.Direction;