I am working on creating EXcel sheet in C#.
No Of columns:4
Name of columns: SNO, Name, ID, Address
There is no constarint on number of row
If you include a reference to Excel Interop you can do whatever you please having Office installed on your system.
A little example:
using Excel = Microsoft.Office.Interop.Excel;
Excel.Application excel = new Excel.Application();
excel.Visible = true;
Excel.Workbook wb = excel.Workbooks.Open(excel_filename);
Excel.Worksheet sh = wb.Sheets.Add();
sh.Name = "TestSheet";
sh.Cells[1, "A"].Value2 = "SNO";
sh.Cells[2, "B"].Value2 = "A";
sh.Cells[2, "C"].Value2 = "1122";
wb.Close(true);
excel.Quit();