Make All fields read only

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Code Snippet for making all form fields read only.

function makeFieldsReadOnly() {
    var controls = Xrm.Page.ui.controls.get();
    for (var i in controls) {
        var control = controls[i];
        if (control.getDisabled && control.setDisabled && !control.getDisabled()) {
            control.setDisabled(true);
        }
    }
}