Use the Rows property to work with rows. This property returns an IRangeRows interface which represents the rows of the range.
In the following example, Rows[1] returns row one of used range on Sheet1.
[C#]
book.Worksheets[1].UsedRange.Rows[1].Font.Bold = true;
[Visual Basic]
book.Worksheets(1).UsedRange.Rows(1).Font.Bold = True
[C++]
book->Worksheets->Item[1]->UsedRange->Rows->Item[1]->Font->Bold = true;
This example clears contents of row three in the range B5:F19.
[C#]
book.Worksheets[1].Range["B5:F19"].Rows[3].ClearContents();
[Visual Basic]
book.Worksheets(1).Range("B5:F19").Rows(3).ClearContents()
[C++]
book->Worksheets->Item[1]->Range->Item[S"B5:F19"]->Rows->Item[3]->ClearContents();
This example merges the first row of range B2:C5.
[C#]
book.Worksheets[1].Range["B2:C5"].Rows[1].Merge();
[Visual Basic]
book.Worksheets(1).Range("B2:C5").Rows(1).Merge()
[C++]
book->Worksheets->Item[1]->Range->Item[S"B2:C5"]->Rows->Item[1]->Merge();