C#

public abstract class BaseClass
{
    protected BaseClass()
    { }

    protected BaseClass(int id)
    {
        ID = id;
    }

    public int ID
    {
        get;
        private set;
    }

    public string Text
    {
        get;
        internal set;
    }
}

public class DerivedClass : BaseClass
{
    public DerivedClass() : base() { }

    public DerivedClass(int id) : base(id) { }

    public DerivedClass(int id, string text) : base(id)
    {
        Text = text;
    }
}

prasadbuddhika wrote:

button1_Click+= Form1_FormClosing;

button1.Click += new EventHandler(Form1_FormClosing);

Form.Close();

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        FormClosing += new FormClosingEventHandler(Form1_FormClosing);
        btnExit.Click += new EventHandler(btnExit_Click);
    }

    void btnExit_Click(object sender, EventArgs e)
    {
        Close();
    }

    void Form1_FormClosing(object sender, FormClosingEventArgs e)
    {
        e.Cancel = (MessageBox.Show(
            this,
            "Do you really wish to exit this application?",
            "Confirm Exit",
            MessageBoxButtons.YesNo,
            MessageBoxIcon.Question,
            MessageBoxDefaultButton.Button2) != DialogResult.Yes);
    }
}

private void Form1_FormClosing(object sender,EventArgs e)
   {
   DialogResult ds = MessageBox.Show("exit?", "exit", MessageBoxButtons.YesNo);
   FormClosingEventArgs ee = (FormClosingEventArgs)e;
   if (ds == DialogResult.Yes)
      {
      ee.Cancel = false;
      }
   else
      {
      ee.Cancel = true;
      }
   }

private void Form1_Load(object sender, EventArgs e)
   {
   button1_Click+= Form1_FormClosing;
   }

private void Form1_FormClosing(object sender,EventArgs e)
   {
   DialogResult ds = MessageBox.Show("exit?", "exit", MessageBoxButtons.YesNo);
   if (e is FormClosingEventArgs)
      {
      FormClosingEventArgs ee = e as FormClosingEventArgs;
      ee.Cancel = (ds == DialogResult.No);
      }
   }

private void Button1_Click(object sender, EventArgs e)
   {
   this.Close();
   }

Label_0104:
foreach (Character character in this.charSet)///Error of stack overflow execption in Charset//
{
   foreach (CharClass class2 in classArray)
   {
      if (character.type == class2)
      {
         num17++;
         goto Label_0104;
      }
   }
}