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VSTO

 //Instantiate the Application object.

Excel.Application excelApp = Application;

//Excel.Application excelApp = Application;

//Specify the template excel file path.

string myPath = "Protect and unProtect Worksheets.xlsx";

//Open the excel file.

excelApp.Workbooks.Open(myPath, Missing.Value, Missing.Value,

Missing.Value, Missing.Value,

Missing.Value, Missing.Value,

Missing.Value, Missing.Value,

Missing.Value, Missing.Value,

Missing.Value, Missing.Value,

Missing.Value, Missing.Value);

//Protect the worksheet specifying a password with Structure and Windows attributes.

((Excel.Worksheet)excelApp.ActiveSheet).Protect("thispassword",

	missing, missing, missing, missing, missing, missing, missing, missing,

	missing, missing, missing, missing, true, missing, missing);

//Unprotect the worksheet specifying its password.

((Excel.Worksheet)excelApp.ActiveSheet).Unprotect("thispassword");

//Save the file.

excelApp.ActiveWorkbook.Save();

//Quit the Application.

excelApp.Quit();

Aspose.Cells

 //Specify the template excel file path.

string myPath = "Protect and unProtect Worksheets.xlsx";

//Instantiate a new Workbook.

//Open the excel file.

Workbook workbook = new Workbook(myPath);

//Protect the worksheet specifying a password with Structure and Windows attributes.

workbook.Worksheets[workbook.Worksheets.ActiveSheetIndex].Protect(ProtectionType.All, "thispassword", "");

//Unprotect the worksheet specifying its password.

workbook.Worksheets[workbook.Worksheets.ActiveSheetIndex].Unprotect("thispassword");

//Save As the excel file.

workbook.Save(myPath);

Ladda ned provkoden

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