Closures at work here. Simply creating a local copy of "var c" inside the loop will solve the issue.

public sealed class SomeType
{
    public event EventHandler Triggered;
    public void Trigger()
    {
        // update state here
        var local = Triggered;
        if (local != null)
        {
            local(this, EventArgs.Empty);
        }
    }
}

class Program
{
    static void Main(string[] args)
    {
        var st = new SomeType();
        var corners = new[] { "North", "South", "East", "West" };
        foreach (var c in corners)
        {
            var local = c; // Create a local copy
            st.Triggered += (s, a) => Console.WriteLine("{0} reporting ...", local); // Use that local copy instead of "c"
        }
        st.Trigger();
    }
}

A similar issue discussed here: http://stackoverflow.com/questions/271440/c-captured-variable-in-loop

It can be done by adding a handler to following events:

UIElement.KeyUpEvent
UIElement.KeyDownEvent  
UIElement.MouseLeftButtonDownEvent
UIElement.MouseLeftButtonUpEvent
UIElement.MouseWheelEvent
UIElement.TextInputEvent
UIElement.TextInputStartEvent
UIElement.TextInputUpdateEvent

Using following code:

// set last argument to true if want to handle `handled` events
AddHandler(UIElement.MouseLeftButtonDownEvent, new MouseButtonEventHandler(OnMouseLeftButtonDown), false);

On an element.

For example for following handler:

private void OnMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    System.Diagnostics.Debug.WriteLine(String.Format("Sender: {0}, OriginalSource: {1}", sender, e.OriginalSource));
}

sender will be the element down below and e.OriginalSource will be the actual element that was directly under mouse.

[NOTE: This example was created in Silverlight 4]

PlaceHolder control forgets everything that it had on each postback (Stateless behavior). You have to remember it instead. Following code works:

Int32 TextBoxCount
{
    get
    {
        if (ViewState["TextBoxCount"] == null) ViewState["TextBoxCount"] = 0;
        return (Int32)ViewState["TextBoxCount"];
    }
    set { ViewState["TextBoxCount"] = value; }
}

protected void Page_Load(object sender, EventArgs e)
{ }

protected void Unnamed1_Click(object sender, EventArgs e)
{
    TextBoxCount++;

    for (int i = 0; i < TextBoxCount; i++)
    {
        TextBox txt = new TextBox();
        PlaceHolder1.Controls.Add(txt);
    }
}

[NOTE: Above code is not perfect but proves the point]