While the Spreadsheet does not have a method for making cells readonly you can disable a cell or range of cells through the SpreadsheetRange object's client-side API:
spreadsheet = $find(
"<%= RadSpreadsheet1.ClientID %>"
activeSheet = spreadsheet.get_activeSheet();
range = activeSheet.get_range(
The user would not be able to modify the value of a cell disabled using the above method, however the value still can be used in functions and formulas.
As for hiding sheets when importing from Excel, the Spreadsheet does not support such functionality. With regard to hiding specific information, once the control is loaded, it supports
hiding sheet rows and columns which are accessed by their index.
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