peplamb peplamb - 1 month ago 6
C# Question

How do i raise an event in a usercontrol and catch it in mainpage?

I have a

UserControl
, and I need to notify the parent page that a button in the
UserControl
was clicked. How do I raise an event in the
UserControl
and catch it on the Main page? I tried using
static
, and many suggested me to go for events!

Answer

Check out Event Bubbling -- http://msdn.microsoft.com/en-us/library/aa719644%28vs.71%29.aspx

Edit to add a quick example: (and additional edit to improve formatting)

User Control

public event EventHandler StatusUpdated;

private void FunctionThatRaisesEvent()
{
    //Null check makes sure the main page is attached to the event
    if (this.StatusUpdated != null)
       this.StatusUpdated(new object(), new EventArgs());
}

Main Page/Form

public void MyApp()
{
     //USERCONTROL = your control with the StatusUpdated event
     this.USERCONTROL.StatusUpdated += new EventHandler(MyEventHandlerFunction_StatusUpdated);
}

public void MyEventHandlerFunction_StatusUpdated(object sender, EventArgs e)
{
         //your code here
}