Navigation buttons using a listView. (Prev and Next)

Hi!

Please check this, I tested by the extension of your code it worked for me:

this is the code under partial Class Form1: Form

        TextBox txtPicSelected = new TextBox();       //Your Textbox I didn't create it.
        string Loc = @"C:\Users\Shahan\Pictures\";  //Global Variable
        public Form1()
        {
            InitializeComponent();
            PopulateListView();
            listView1.MultiSelect = false;
            listView1.Select();
            listView1.Items[0].Selected = true; 
        }

        private void PopulateListView()
        {
            string SelectView = "View." + txtPicSelected.Text;
            listView1.View = View.List;
            System.IO.DirectoryInfo dirInfo = new System.IO.DirectoryInfo(Loc);
            System.IO.FileInfo[] files = dirInfo.GetFiles("*.jpg");
            if (files != null)
            {
                foreach (System.IO.FileInfo file in files)
                {
                    ListViewItem item = new ListViewItem(file.Name);
                    item.SubItems.Add(file.FullName);
                    listView1.Items.Add(item);
                    txtPicSelected.Text = "0";
                }
            }
        }
       
        private void listView1_MouseDown(object sender, MouseEventArgs e)
        {
            //lblNone.Visible = false;
            ListViewItem selection = listView1.GetItemAt(e.X, e.Y);
            if (selection != null)
            {
                string name = selection.ToString().Remove(0, 15).TrimEnd('}');
                txtPicSelected.Text = name.ToString();
                if (selection != null)
                {
                    pbThump.Image = System.Drawing.Image.FromFile(selection.SubItems[1].Text);
                }
            }
        }

        private void Nextbtn_Click(object sender, EventArgs e)
        {
            int index = listView1.SelectedItems[0].Index;

            if (index < listView1.Items.Count - 1)
            {
                listView1.Select();
                listView1.Items[index + 1].Selected = true;
                btnPrev.Enabled = true;
                if((index = listView1.SelectedItems[0].Index) == listView1.Items.Count-1)
                    Nextbtn.Enabled = false;
            }
            else
                Nextbtn.Enabled = false;
        }

        private void btnPrev_Click(object sender, EventArgs e)
        {
            int index = listView1.SelectedItems[0].Index;
            if (index > 0)
            {
                listView1.Select(); 
                listView1.Items[index - 1].Selected = true;
                Nextbtn.Enabled = true;
                if ((index = listView1.SelectedItems[0].Index) == 0)
                    btnPrev.Enabled = false;
            }
            else
                btnPrev.Enabled = false;
        }

        private void listView1_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (listView1.SelectedItems.Count !=0)
                pbThump.Image = System.Drawing.Image.FromFile(Loc + listView1.SelectedItems[0].SubItems[0].Text);
        }