C interview question

Question

I need assistance with an interview question.

You have the following code-behind class in ASP.NET:

public partial class Page1 : Page 
{
    private string _value;

    public Page1() 
    {
        if (DateTime.Now.Ticks % 10 == 0)
            _value = "Test";
    }       

    ~Page1() 
    {
        if(_value.Equals("Test"))
            _value = string.Empty;      
    }
}

The w3wp.exe process stops unexpectedly every time someone requests this page.

1. Why does this happen instead of the user seeing the yellow screen of death (ASP.NET's default error page)?
2. Why does the managed heap always have an OutOfMemoryException?