probelm in keypress event

[iswaryasenthilkumar]

if i press e in keyboard,,my application should close,,i tried (this.close) bt my application was not closed,
my code below:

widget.cpp
void Widget::keyPressEvent(QKeyEvent *event)
{
 
        if(event->key()==Qt::Key_E)
        {
           this->close();
        }
}

widget.cpp
void Widget::keyPressEvent(QKeyEvent *event)
{

        if(event->key()==Qt::Key_E)
        {
           this->close();
        }
}

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what am doing wrong?? please give me suggestion for this
Thanks in advance