Q:

Is cell locking is possible in excel using officewriter?

I need to lock a particular cell value in an Excel file using OfficeWriter. Is this possible? If so, what API calls do I need to use? 

A:

Locking a cell with OfficeWriter is the same as it is in Excel: all cells have a 'locked' property as part of their style. The locked property is set to true by default, but does not take affect until the worksheet is protected. 
ExcelApplication xla = new ExcelApplication();
Workbook wb = xla.Create(ExcelApplication.FileFormat.Xlsx);
Worksheet ws = wb.Worksheets[0];

//Protecting the sheet will lock any cells 
//that have the locked property set to true
ws.Protect("MyPassword");

To leave certain cells unlocked, create a style where the locked property is set to false. Then apply the style to the cells you wish to leave unlocked.
ExcelApplication xla = new ExcelApplication();
Workbook wb = xla.Create(ExcelApplication.FileFormat.Xlsx);
Worksheet ws = wb.Worksheets[0];

//Create the 'unlocked' style
Style unlockedStyle = wb.CreateStyle();
unlockedStyle.CellLocked = false;

//Apply to any cells you wish to leave unlocked
//when the worksheet is protected
ws.Cells["A1"].Style = unlockedStyle;
ws.Cells["B1"].Style = unlockedStyle;

//Protecting the sheet will lock any cells 
//that have the locked property set to true
ws.Protect("MyPassword");

We have some additional related information on protecting worksheets in our documentation: http://wiki.softartisans.com/display/EW8/Protecting+Your+Worksheet
Note, I work for SoftArtisans, makers of OfficeWriter. 

