C#

do
   {
   Console.WriteLine(...
   ...
   s = Console.ReadLine();
   } while (s != "9")

All those who believe in psycho kinesis, raise my hand.

My 's gonna unleash hell on your ass. tastic!

Console.WriteLine("1:Add\n2:Sub\n3:Mult:\n4:Div");
Console.WriteLine();
Console.WriteLine("Press 9 to Exit or Enter to Continue ");

ConsoleKeyInfo cki = Console.ReadKey();

switch (cki)
{
    case ConsoleKey.D9:
        Console.WriteLine("exit");
        break;

    case ConsoleKey.Enter:
        Console.WriteLine("continue");
        break;

    case ConsoleKey.D1:
        Console.WriteLine("Add");
        break;

    case ConsoleKey.D2:
        Console.WriteLine("Sub");
        break;

    case ConsoleKey.D3:
        Console.WriteLine("Mult");
        break;

    case ConsoleKey.D4:
        Console.WriteLine("Div");
        break;

    default: break;
}

//SAVE Button Click event
 
           {
             tbSystem tb = new tbSystem();
             tb.System_DeliveryDate = System_DeliveryDateDateTimePicker.Value;
             tb.System_Description = System_DescriptionRichTextBox.Text;
             tb.System_Name = System_NameTextBox.Text;
             tb.System_Priority = (int)System_PriorityComboBox.SelectedValue;
             tb.System_Status = (int)System_StatusComboBox.SelectedValue;

             //LastEditBy and CreatedBy Fields are set to database default suser_sname()
             //LastEditDate and CreationDate are set to database default getdate() 

                try
                {
                    tmx.tbSystem.InsertOnSubmit(tb);   // tmx is the datacontext tmx = new datacontext()
                    tmx.SubmitChanges();
                    
                }
                catch (Exception ex)
                {
                    throw new Exception(ex.Message);
                }

                MessageBox.Show("Date is Validated and saved");
            }