Which dll or library can be used to create the excelsheet which is not of a particular format such that a template can be used in this context. While the rows and columns may be merged. Number of columns are not fixed.
For example: In the first row column 1 and 2 are merged while in the second row the 2 rows of second column are merged. Say first row is containing 5 columns while the second row is of 4 columns.
Interop is not desired as the system running the program may not have Microsoft office installed with it.
Any suggestions would be a great helping.
There are several options out there (free and commercial):
Another option (though not really recommended) is to generate a HTML file with specific tags – supported by Excel as per MS documentation http://msdn.microsoft.com/en-us/library/Aa155477%28office.10%29.aspx . For a sample of this including source code see http://www.c-sharpcorner.com/UploadFile/kaushikborah28/79Nick08302007171404PM/79Nick.aspx