I wrote this code that fills an array and a second array copies the first. I change some numbers in the second array, but when I output both arrays, the first one has also changed. This is my code:

       int[] array1 = new int[5]; 
        int[] array2 = new int[5]; 
        int temp; 
        for (int i = 0; i < array1.Length; i++) 
        { 
            array1[i] = i; 
        } 
        array2 = array1; 
        temp = array2[2]; 
        array2[2] = array2[4]; 
        array2[4] = temp; 
        for (int i = 0; i < array1.Length; i++) 
        { 
            richTextBox1.Text += array1[i].ToString() + " "; 
        } 
        for (int i = 0; i < array2.Length; i++) 
        { 
            richTextBox1.Text += array2[i].ToString() + " "; 
        }

Can someone explain to me why the output is 0 1 4 3 2 0 1 4 3 2 instead of 0 1 2 3 4 0 1 4 3 2?