C#

#include <QCheckBox>
#include <QMouseEvent>

class MyCheckBox : public QCheckBox
{
public:
    void mousePressEvent(QMouseEvent *event);
};

void MyCheckBox::mousePressEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton) {
        // handle left mouse button here
    } else {
        // pass on other buttons to base class
        QCheckBox::mousePressEvent(event);
    }
}

class MyWidget : public QWidget
{
public:
    bool event(QEvent *event);
};

static const int MyCustomEventType = 1099;

class MyCustomEvent : public QEvent
{
public:
    MyCustomEvent() : QEvent((QEvent::Type)MyCustomEventType) {}
};

bool MyWidget::event(QEvent *event)
{
    if (event->type() == QEvent::KeyPress) {
     QKeyEvent *ke = static_cast<QKeyEvent *>(event);
     if (ke->key() == Qt::Key_Tab) {
        return true;
     }
    } else if (event->type() == MyCustomEventType) {
     MyCustomEvent *myEvent = static_cast<MyCustomEvent *>(event);
       return true;
    }
    return QWidget::event(event);
}

int main()
{
}

<startup useLegacyV2RuntimeActivationPolicy="true">
    <supportedRuntime version="v4.0"/>
  </startup>

SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename="+ System.IO.Directory.GetCurrentDirectory()+"\\Database.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True;");

SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename="C:\\Users\\ccs\\documents\\visual studio 2010\\Projects\\Database Software Pack\\Database Software Pack\\Database.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True;");