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How to: Protect a Workbook

The following code protects workbook structure with a password (“password”), preventing end-users from adding or deleting worksheets, and from displaying hidden worksheets.

// Protect workbook structure (prevents users from adding or deleting worksheets
// or from displaying hidden worksheets).
if (!workbook.IsProtected)
    workbook.Protect("password", true, false);
workbook.Worksheets[0].Visible = false;
Worksheet worksheet = workbook.Worksheets[1];
worksheet["D5"].Value = "You are not allowed to add or delete a worksheet.";
worksheet["D6"].Value = "Hidden worksheets cannot be displayed.";

Use the IWorkbook.Unprotect method to remove protection.

When protection is applied programmatically, end-users can invoke the Protect Workbook Dialog to remove protection.

See Also