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Gets or sets the IRange object that represents the auto merge range.
IRange Range { get; set; }
Property Range As IRange
worksheet.AutoMerge(worksheet.Range["A1:A4"], AutoMergeDirection.Column);
IAutoMergeRangeInfo mergeInfo = worksheet.AutoMergeRangesInfo[0];
mergeInfo.Range = worksheet.Range["B1:B4"];
IRange mergeRange = mergeInfo.Range;