Question

this code should work like merge sort algorithm but it doesnt work and gives the output 0 instead of sorting numbers,whats the problem friends?thanks

 private void button3_Click(object sender, EventArgs e)
    {


        string[] source = textBox1.Text.Split(',');
        string[] source1 = textBox3.Text.Split(',');
        int[] nums2 = new int[8];
        int[] nums = new int[source.Length];
        for (int i = 0; i < source.Length; i++)
        {
            nums[i] = Convert.ToInt32(source[i]);

        }
        int[] nums1 = new int[source1.Length];
        for (int j = 0; j < source1.Length; j++)
        {
            nums1[j] = Convert.ToInt32(source1[j]);
        }
        int x = 0;
        int y = 0;
        int z = 0;

        while (x < nums.Length && y < nums1.Length)
        {
            if (nums[x] < nums1[y])
            {
                nums2[z] = nums[x];
                x++;

            }
            else
            {
                nums2[z] = nums1[y];
                y++;
            }

            z++;
        }

        while (x > nums.Length){
            if (y <= nums1.Length)
            {
                nums2[z] = nums1[y];

                z++;
                y++;
            }
        }
        while (y > nums1.Length)
        {

            if (x <= nums.Length)
            {
                nums2[z] = nums[x];
                z++;
                x++;
            }
        }
            string merge = "";
            foreach (var n in nums2)
                merge += n.ToString() + ",";
            textBox4.Text = merge;


        }

Answer 1

For getting your output completely, try

   string merge="";
   foreach(var n in nums2)
       merge+=n.ToString() + " ";
   textBox4.Text = merge;

(ok, this can be done faster / nicer / fancier using Linq & String.Join, or a StringBuilder, but for testing purposes this should be enough).

Perhaps this does not solve all the problems with your code above, but it will probably help you to debug it easier.