c# trying to get an event to fire when a different window closes

I have one form that has an option to open another (dialogue)开发者_如何学Go. I want an event to fire when the second window closes. The first form is named frmMain() the other is frmAddEmployee(). Heres what I have: in frmMain()

//create and open the second window
public void (object sender, EventArgs e)
{
     frmAddEmployee addEmp = new frmAddEmployee();
     addEmp.ShowDialogue();
}

//create event to handle addEmp being closed
public void addEmp_Closing(object sender, EventArgs e)
{
     PopulateEmployeeList();
}

I'm not sure the event is being recognized as an event. What am I doing wrong?

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Events in C# have to be registered manually - the C# compiler will not automatically register method as an event handler based just on the name of the method. You need:

 frmAddEmployee addEmp = new frmAddEmployee(); 
 addEmp.Closing += addEmp_Closing; // Register event handler explicitly
 addEmp.ShowDialogue(); 

Automatic registration of events is done in ASP.NET and Visual Basic has Handles clause, but in C#, you need to use the += operator to specify that some method should be called when an event occurs.

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Assuming ShowDialogue means ShowDialog, then it shows the form modally and you don't need an event handler:

//create and open the second window
public void (object sender, EventArgs e)
{
     frmAddEmployee addEmp = new frmAddEmployee();
     addEmp.ShowDialog();
     PopulateEmployeeList();
}

If you don't show the second form modally, then you can hook up the event handler before showing the form like this:

public void (object sender, EventArgs e)
{
     frmAddEmployee addEmp = new frmAddEmployee();
     addEmp.FormClosed += AddEmpClosed;
     addEmp.Show();
}

private void AddEmpClosed(object sender, FormClosedEventArgs e)
{
     PopluateEmployeeList();
}

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There is Closing and Closed events which you can register for on the Form. You are registered for neither, unless your registration is taking place somehwere else?

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Before you call addEmp.ShowDialog() you need to set your method to handle the Closing event:

frmAddEmployee addEmp = new frmAddEmployee();
addEmp.Closing += addEmp_Closing;
addEmp.ShowDialogue();