int Naslov_rnd;
TextBox tb;

private void Naslov_p_Click(object sender, EventArgs e)
{
    Naslov_rnd++;

    tb = new TextBox();
    VizitKartica.SuspendLayout();

    tb.Location = new Point(0, 0);
    tb.Multiline = true;
    tb.Size = new Size(200, 20);
    tb.BorderStyle = BorderStyle.None;
    tb.BackColor = Color.DodgerBlue;
    tb.ForeColor = Color.White;
    tb.Name = "Naslov_" + Naslov_rnd.ToString(); ;
    tb.Text = "Dodajte Vaš naslov";
    tb.Font = new Font("Microsoft Sans Serif", 12);

    VizitKartica.Controls.Add(tb);
    elementi_lista.AddItem(tb.Name);

    VizitKartica.ResumeLayout(true); Controls collection

      tb.MouseMove += new MouseEventHandler(tb_MouseMove);
    tb.MouseDown += new MouseEventHandler(tb_MouseDown);
}

protected void tb_MouseMove(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left)
    {
        tb.Left = e.X + tb.Left;
        tb.Top = e.Y + tb.Top;
    }
}

protected void tb_MouseDown(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left)
    {
        Point MouseDownLocation = e.Location;
    }
}

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    int Naslov_rnd;

    private void button1_Click(object sender, EventArgs e)
    {
        Naslov_rnd++;

        TextBox tb = new TextBox();
        VizitKartica.SuspendLayout();

        tb.Location = new Point(0, 0);
        tb.Multiline = true;
        tb.Size = new Size(200, 20);
        tb.BorderStyle = BorderStyle.None;
        tb.BackColor = Color.DodgerBlue;
        tb.ForeColor = Color.White;
        tb.Name = "Naslov_" + Naslov_rnd.ToString();
        tb.Text = "Dodajte Vaš naslov";
        tb.Font = new Font("Microsoft Sans Serif", 12);

        VizitKartica.Controls.Add(tb);

        VizitKartica.ResumeLayout(true);

        tb.MouseMove += new MouseEventHandler(tb_MouseMove);
        tb.MouseDown += new MouseEventHandler(tb_MouseDown);
    }

    protected void tb_MouseMove(object sender, MouseEventArgs e)
    {
        TextBox tb2 = (TextBox) sender;
        if (e.Button == MouseButtons.Left)
        {
            tb2.Left = e.X + tb2.Left;
            tb2.Top = e.Y + tb2.Top;
        }
    }

    protected void tb_MouseDown(object sender, MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Left)
        {
            Point MouseDownLocation = e.Location;
        }
    }
}