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Workbook.Unprotect Method

Removes protection from the workbook. This method has no effect if the workbook is not protected.

Namespace: Microsoft.Office.Tools.Excel
Assembly: Microsoft.Office.Tools.Excel (in microsoft.office.tools.excel.dll)

public virtual void Unprotect (
	[OptionalAttribute] Object Password



The case-sensitive password to use to unprotect the workbook. If the workbook is not protected with a password, this parameter is ignored. If you omit this parameter for a workbook that is protected with a password, the method fails.

If you forget the password, you cannot unprotect the workbook. It is a good idea to keep a list of your passwords and their corresponding document names in a safe place.

Optional Parameters

For information on optional parameters, see Understanding Optional Parameters in COM Interop.

The following code example uses the Protect method to protect the structure of the workbook and workbook windows, but without specifying password protection. The example then prompts the user to unprotect the workbook by using the Unprotect method.

private void WorkbookUnprotect()
    MessageBox.Show("Protecting the workbook.");
    this.Protect(missing, true, true);

    if (DialogResult.Yes == MessageBox.Show("Unprotect the workbook?",
        "Custom Unprotect Dialog", MessageBoxButtons.YesNo))

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