New Post: How to determine if two cells are merged together

Pick up the latest source code (just fixed a minor issue).

You're looking for:

range.IsMerged - Tells you is any cell in the range is part of a merge.
worksheet.MergedRanges - Tells you the specific ranges that are merged.

Example:

            var wb = new XLWorkbook();
            var ws = wb.AddWorksheet("Sheet1");

            ws.Range("A2:A3").Merge();

            Console.WriteLine(ws.Range("A1:A2").IsMerged()); // True
            Console.WriteLine(ws.Range("A2:A3").IsMerged()); // True
            Console.WriteLine(ws.Range("A1:A4").IsMerged()); // True
            Console.WriteLine(ws.Range("A4:A5").IsMerged()); // False

            Console.WriteLine(ws.MergedRanges.Contains(ws.Range("A2:A3"))); // True
            Console.WriteLine(ws.MergedRanges.Contains(ws.Range("A2:A4"))); // False