C#

public partial class TreeDisplay : Form  
    {  
        public string Filename  
        {            get { return filename; }        }  
        protected string filename;  
        //Declaring constructor of the Class  
        public TreeDisplay()  
        {  
            InitializeComponent();  
            this.Text = "Tree View of XML File";//Form Title.  
        }//TreeDisplay Constructor  
        private void initiatingTree(string nameofFile)  
        {  
            try 
            {              
                treeView1.Nodes.Clear();  
                if (xmlDocument.DocumentElement != null) treeView1.Nodes.Add(new TreeNode(xmlDocument.DocumentElement.Name));  
                //Creating TreeNode and adding the first node to it.  
                TreeNode tNodeObj = treeView1.Nodes[0];  
                                 
                XmlNode xNode = xmlDocument.DocumentElement;  
 
                //Declaring function for adding Nodes to tree View.  
                AddingNodesToTree(xNode,tNodeObj);  
                toolStripStatusLabel1.Text = "Opened file " + nameofFile;  
                treeView1.Nodes[0].Expand();  
                treeView1.CollapseAll();  
            }//try block ends  
            //Exception Handlers to catch any sort of error  
            catch (XmlException xmlex)  
            {  
                MessageBox.Show(xmlex.Message, "Error");  
            }//catch  
            catch (Exception exp)  
            {  
                txtFileName.Text = exp.Message;  
            }  
        }//initiatingTree  
private void btnBrowse_Click(object sender,EventArgs e)
        {
            bgWorker1.RunWorkerAsync();
            StripProgressBar.Value = 0;
            toolStripStatusLabel1.Text = "Browsing for a  Xml file";
            OpenFileDialog open = new OpenFileDialog();
            
            if (open.ShowDialog(this) == DialogResult.OK)
            {
                txtFileName.Text = open.FileName;
                initiatingTree(open.FileName); 
            }
            while (this.bgWorker1.IsBusy)
            {
                StripProgressBar.Increment(1);
                Application.DoEvents();
            }
        }//Browse button      
        private void bgWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            xmlDocument = new XmlDocument();
            Thread.Sleep(5000);
            xmlDocument.Load(txtFileName.Text);
            btnBrowse.Enabled = false;
        }
        private void bgworker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
         {
             StripProgressBar.Value = 100;
             if (e.Error == null)
             {
                 MessageBox.Show(xmlDocument.InnerXml, "Download Complete");
             }
             else
             {
                 MessageBox.Show("Failed to download file");                    
             }
             // Enable the Browse button and reset the progress bar.
             this.btnBrowse.Enabled = true;
             StripProgressBar.Value = 0;
             toolStripStatusLabel1.Text = "work finished processing request.";  
         }//workerCompleted  
    }// TreeDisplay Class  

Rectangle topLeftRect = new Rectangle(0, 0, borderThickness, borderThickness);

Rectangle topRect = new Rectangle(borderThickness, 0, this.Width - (borderThickness * 2), borderThickness);
Rectangle botRect = new Rectangle(borderThickness, this.Height - borderThickness - 1, this.Width - (borderThickness * 2), borderThickness);
Rectangle leftRect = new Rectangle(0, borderThickness, borderThickness, this.Height - (borderThickness * 2));
Rectangle rightRect = new Rectangle(this.Width - borderThickness - 1, borderThickness, borderThickness, this.Height - (borderThickness * 2));



e.Graphics.FillRectangle(new LinearGradientBrush(topRect, Color.Transparent, Color.Gray, 90, false), topRect);
e.Graphics.FillRectangle(new LinearGradientBrush(botRect, Color.Transparent, Color.Gray, 270, false), botRect);
e.Graphics.FillRectangle(new LinearGradientBrush(leftRect, Color.Transparent, Color.Gray, 0, false), leftRect);
e.Graphics.FillRectangle(new LinearGradientBrush(rightRect, Color.Transparent, Color.Gray, 180, false), rightRect);

e.Graphics.FillRectangle(new LinearGradientBrush(topLeftRect, Color.Transparent, Color.Gray, 35, false), topLeftRect);