why polyline not moved in this code?

function UpdateLine() {
        path = DirectLine.getPath();
        //alert('move from ' + path.getAt(0) + ', ' + path.getAt(1));
        DirectLine.setPath([MarkerStart.getPosition(),
MarkerEnd.getPosition()]);
        path = DirectLine.getPath();
        //alert('to ' + path.getAt(0) + ', ' + path.getAt(1));
}

and moved in this

function UpdateLine() {
        path = DirectLine.getPath();
        alert('move from ' + path.getAt(0) + ', ' + path.getAt(1));
        DirectLine.setPath([MarkerStart.getPosition(),
MarkerEnd.getPosition()]);
        path = DirectLine.getPath();
        alert('to ' + path.getAt(0) + ', ' + path.getAt(1));
}

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