prevent users from changing formulas in excel code example

Example: excel protect cells with formulas

' Protects cells containing formulas, with password
' pPwd: password to protect / unprotect
Sub ProtectFormulas(ByRef pRange As Range, ByVal pPwd As String)
    ActiveSheet.Unprotect pPwd
    For Each r In pRange
        r.Locked = IIf(r.HasFormula, True, False)
    Next r
    ActiveSheet.Protect pPwd
End Sub

Sub TestIt()
    ProtectFormulas Range("A1:B4"), "MyPassWord"
End Sub