Random erratic motion (x-axis) of a picture box control in C#

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C#

game

random

For instance take a board with a form which moves from left to right and vice versa , i want this to be random. Actually, i want the landing of a ship to be random. Sample code that I wrote.I want to work only in the x-axis.

public partial class theForm : Form
    {
        int xx;
        int x;
        int dx = 1;
        public theForm()
        {
            InitializeComponent();
        x = picBall.Location.X;
        xx = 0;

    }

    private void theForm_Load(object sender, EventArgs e)
    {

    }

    Random rnd = new Random();

    private void timer1_Tick(object sender, EventArgs e)
    {

        int rest = rnd.Next(picBoard.Location.X, this.ClientSize.Width);

        x += dx;
        if (x > rest)
        {
            dx *= -1;
            xx = rnd.Next(0, x - 5);
        }
        else if (x < 0)
        {
            dx *= -1;
        }
        else if (xx > x)
        {

            dx *= -1;
        }

        picBoard.Location = new Point(x, picBoard.Location.Y);
    }
}

What I have tried:

random erratic motion (x-axis) of a picture box control in c#