C#

public class MyForm:Form<br />
{<br />
  private bool _cancelButtonClicked = false;<br />
  private void cancelbutton_clicked(..)<br />
  {<br />
    _cancelButtonClicked = true;<br />
  }<br />
  private void form_closing(..)<br />
  {<br />
     if (_cancelButtonClicked)<br />
     {<br />
        //User clicked the button with the dialog result == cancel<br />
     }<br />
     else<br />
     {<br />
        //User clicked X button to close the form<br />
     }<br />
  }<br />
}

private const int WM_SYSCOMMAND = 0x112; 
private const int SC_CLOSE = 0xF060;

protected override void WndProc(ref Message m)
{
     if (m.Msg == WM_SYSCOMMAND && m.WParam.ToInt32() == SC_CLOSE)
     {
          //do something here
     }
}

<br />
            System.Windows.Forms.ToolStripMenuItem mi = (ToolStripMenuItem)menuStrip1.Items[0];<br />
            mi.DropDownItems[0].Enabled = false;

joly_1 wrote:

Index outside the bounds of the array.

string[] nameOfFriends = new string[2]; //This creates an array with size 2. <br />
nameOfFriends[0] = "Mike"; //first element of the array<br />
nameOfFriends[1] = "John"; //second element of the array<br />
nameOfFriends[2] = "David"; //This line will cause error. Because C# arrays are 0 based, and you were trying to set a value of 3rd element when the array can only hold 2 strings.

new_equation[i] = 2; <br />
new_equation[i+1] = 1;

MessageBox.Show(string.Format("Array Length: {0}; I: {1}; I+1: {2}; Will Cause Error? {3}", new_equation.Length.ToString(), i.ToString(), (i+1).ToString(), (i>=new_equation.Length).ToString()));<br />
new_equation[i] = 2; <br />
new_equation[i+1] = 1;

joly_1 wrote:

so, what i should do about it?

for(int i=0; i<myarray.Length; i++)
   // do your comparison here