C# Split String

=== Example program for splitting on spaces (C#) ===

using System;

class Program
{
    static void Main()
    {
        string s = "there is a cat";
        //
        // Split string on spaces.
        // ... This will separate all the words.
        //
        string[] words = s.Split(' ');
        foreach (string word in words)
        {
            Console.WriteLine(word);
        }
    }
}

=== Output of the program ===

there
is
a
cat

The Click Event for Buttons

The Click Event for Buttons

The click event gets activated when a button is clicked on. Examine the default code for a button:
private void button1_Click(object sender, EventArgs e)
{
}
In between the round brackets, we have this:

object sender, EventArgs e

The object keyword refers to the object which activated the event, a button in this case. This is being placed in a variable called sender. You can test this for yourself.
Start a new project. Add a button to your new form and double click it. Place the following code between the curly brackets:

MessageBox.Show( sender.ToString() );

We're just using the ToString method on the sender variable. Run your programme and click the button. You should see this:

The Message is displaying which object was the sender of the event, as well as displaying the Text property of the sender: the button with the Text "button1".
The other argument in between the round brackets was this:

EventArgs e

EventArgs is a class. It's short for event arguments, and tells you which events was raised. The letter "e" sets up a variable to use this class. If you change your line of code to this:

MessageBox.Show( e.ToString() );

the message box will then display the following:

C# Delegate

        // This "DoMath" delegate can point to ANY method that:
        //   - Returns an int
        //   - Accepts two ints as parameters
        public delegate int DoMath(int x, int y);

      
        private void button1_Click(object sender, EventArgs e)
        {
            int result;

            DoMath a = new DoMath(Add);
            result = a(3, 4);
            MessageBox.Show(Convert.ToString(result));

            UseDelegate(a);
        }


        public void UseDelegate(DoMath x)
        {
            int r = x(6, 6);
            MessageBox.Show(Convert.ToString(r));

        }

       
        //This method can be pointed to by the DoMath delegate
        public int Add(int x, int y)
        {
            return x+y;
        }

        //This method can be pointed to by the DoMath delegate
        public int Subtract(int x, int y)
        {
            return x - y;
        }

        //This method can NOT be pointed to by the DoMath delegate
        //because it has a different signature (only one argument)
        public string Test(string y)
        {
            return "Test method";
        }
    }

Loop through the content of an array

            //create the array
            int[] ml = new int[7]; //{ 5, 3, 7, 9, 2, 6, 8, };
           
            //loop through the content of the ml array
            string x = "";

            for (int i = 0; i < ml.Length; i++)
            {
                x += Convert.ToInt32(ml[i]) + " ";
            }

            MessageBox.Show(x);

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