能帮忙把vc改成vb.NET吗？
event EventHandler _MyEvent;、
public event EventHandler MyEvent
{
add
{
_MyEvent += value;
}
remove
{
_MyEvent -= value;
}
}
public void MyEvent()
{
if (_MyEvent != null)
{
_MyEvent(this,new EventArgs());
}
}
[最优解释]

Public Event MyEvent(ByVal sender As Object, ByVal e As EventArgs)

Public Sub MyEvent()
    RaiseEvent MyEvent(Me, New EventArgs())
End Sub

[其他解释]
http://blog.csdn.net/colayungnew/article/details/125323

[其他解释]
还有不清楚的建议你看这个教程自己学一学。
http://msdn.microsoft.com/zh-cn/library/ms172877.aspx