C#

public class frmAddCategory
{
   public event EventHandler CategoryAdded;
   protected virtual void onCategoryAdded(EventHandler e)
   {
        if (CategoryAdded != null)
        {
            CategoryAdded(this,e);
        }
   }
   private void someEventHandler(...)
   {
       onCategoryAdded(EventArgs.Empty);
   }
   //...
}

Deques wrote:

frmCore core = new frmCore();

Deques wrote:

I am not familiar with delegates

public class Form2 : System.Windows.Forms.Form
{
	public delegate void FormClosed();
	public FormClosed FormClosedHandler;

	private void Form2_Closed(object sender, System.EventArgs e)
	{
		FormClosedHandler();	//Invoking delegate
	}
}

public class Form1 : System.Windows.Forms.Form
{
	private void Form1_Load(object sender, System.EventArgs e)
	{
		Form2 obj = new Form2();
		obj.FormClosedHandler += new Form2.FormClosed(this.Form2ClosedHandler);
		obj.Show();
	}
}

private void btnNewPost_Click(object sender, EventArgs e)
{
    Forms.frmAddCategory addcats = new frmAddCategory();
    addcats.Refresher += new Forms.frmAddCategory.refreshcat(this.comboRefresh("newPost"));
    addcats.ShowDialog();
}

comboRefresh(string blah)
{
//code to refresh the combobox
}

public partial class frmAddCategory : Form
{
    //Delegate
    public delegate void refreshcat();
    public refreshcat Refresher;

    private void frmAddCategory_FormClosed(object sender, FormClosedEventArgs e)
    {
        Refresher();
    }

Deques wrote:

addcats.Refresher += new Forms.frmAddCategory.refreshcat(this.comboRefresh("newPost"));

addcats.Refresher += new Forms.frmAddCategory.refreshcat(this.comboRefresh);

Deques wrote:

public delegate void refreshcat();

public delegate void refreshcat(string str);

Deques wrote:

private void frmAddCategory_FormClosed(object sender, FormClosedEventArgs e)
{
Refresher();
}

private void frmAddCategory_FormClosed(object sender, FormClosedEventArgs e)
{
            Refresher("string to be passed");
}

void foo(int param)
{
    param = 2;
}
void main()
{
   int i = 1;
   foo(i);
   Console.WriteLine(i);
}

m@u wrote:

Most Parameters are passed as values to a function

m@u wrote:

the only problem you could have would be, if you pass an object and inside your method, a property of that object is changed

subai wrote:

as far i know, the passed parameters will not change unless they indicated as ref or out