SelectAll Method (RasterThumbnailBrowser)

using Leadtools.WinForms; 
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Drawing; 
 
class MyForm5 : Form 
{ 
   RasterImageList imageList; 
   RasterCodecs codecs; 
 
   public MyForm5(string title) 
   { 
      Text = title; 
 
      // Set the size of the form 
      Size = new Size(400, 200); 
 
      // Create a new RasterImageList control 
      imageList = new RasterImageList(); 
      imageList.Dock = DockStyle.Fill; 
      imageList.SelectionMode = RasterImageListSelectionMode.Single; 
      imageList.Size = Size; 
      Controls.Add(imageList); 
      imageList.BringToFront(); 
 
      codecs = new RasterCodecs(); 
 
      // Create three items 
      string imagesPath = LEAD_VARS.ImagesDir; 
 
      for (int i = 0; i < 3; i++) 
      { 
         // Load the image 
         int index = i + 1; 
         string imageFileName = Path.Combine(imagesPath, @"ImageProcessingDemo\Image" + index.ToString() + ".cmp"); 
         RasterImage image = codecs.Load(imageFileName, 0, CodecsLoadByteOrder.BgrOrGray, 1, 1); 
         RasterImageListItem item = new RasterImageListItem(image, 1, "Item" + index.ToString()); 
 
         // Select the first item 
         if (i == 0) 
            item.Selected = true; 
 
         // Add the item to the image list 
         imageList.Items.Add(item); 
      } 
 
 
      // Use manual selection 
      imageList.SelectionMode = RasterImageListSelectionMode.None; 
 
      // Add a handler to the MouseDown event 
      imageList.MouseDown += new MouseEventHandler(rasterImageList_MouseDown); 
 
      // Add the RasterImageList to the control collection. 
      Controls.Add(imageList); 
   } 
 
   private void rasterImageList_MouseDown(object sender, MouseEventArgs e) 
   { 
      RasterImageList imageList = sender as RasterImageList; 
 
      // Check if we are in manual selection mode and if this is a left button click 
      if (imageList.SelectionMode == RasterImageListSelectionMode.None && 
         e.Button == MouseButtons.Left) 
      { 
         // Yes, get the item under the cursor position 
         RasterImageListItem item = imageList.HitTest(e.X, e.Y); 
 
         // If not already selected, select this item 
         if (item != null && !item.Selected) 
         { 
            imageList.BeginUpdate(); 
 
            // First, de-select any items 
            imageList.SelectAll(false); 
 
            // Now select this item 
            item.Selected = true; 
 
            imageList.EndUpdate(); 
 
            item.Invalidate(); 
         } 
      } 
   } 
} 
 
public void RasterImageList_SelectionMode(string title) 
{ 
   MyForm5 form = new MyForm5(title); 
   form.ShowDialog(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}