You can protect sheets and lock cells in FlexSheet for WPF. IsProtected property is used to protect sheets in C1FlexSheet control. The following code illustrates the use of IsProtected property:

protectedSheet.IsProtected = True

protectedSheet.IsProtected = true;

AddLockedCell method can be used to lock cells in C1FlexSheet control. The AddLockedCell method locks the specified cell range, as illustrated in the following code:

protectedSheet.AddLockedCell(0, 0, 1, 1)

protectedSheet.AddLockedCell(0, 0, 1, 1);