how to populate and use treeview nodes in proper way when they are conecting to system location

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I am facing one problem when I am clicking on treeview nodes.
The problem is the first node is not activated next time.
I am dong image converting to text in my project. At that time I am populating treeview from system location and click node by node.

The problem is when I am clicking on the first node it shows the image in a picture box well.
Then after when I am clicking the next time the same image it is not working and the node is not activated.

What is the problem in my code?
My code is:

C#

    string fldr = ConfigurationSettings.AppSettings["IMGFOLDER"];
    formload()
{
  PopulateTreeview();
}
BtnImageShow()
{
DisplayImage();

}
  private void POpulateTreeview()
        {
            DirectoryInfo info = new DirectoryInfo(fldr);
            TreeNode root = new TreeNode(info.Name);
            root.Text = "";

            TreeNode node = new TreeNode();
            TrvImageFile.Nodes.Add(root);
            FileInfo[] subfileinfo = info.GetFiles("*.*");
            if (subfileinfo.Length > 0)
            {
                for ( j = 0; j < subfileinfo.Length; j++)
                {
                    root.Nodes.Add(subfileinfo[j].Name);
                }
            }

            TrvImageFile.ExpandAll();
        }
  DisplayImage()
{

fldr = string.Concat(fldr, "\\");
            fpath = string.Concat(fldr, TrvImageFile.SelectedNode.Text);
            try
            {
                rasterImageViewer1.Image = rc.Load(fpath);
            }
            catch (Exception ex)
            {
                MessageBox.Show("nothing  to select there ");
                MessageBox.Show(ex.Message);
            }
}

Anybody help me.
I am looking for standard code.
Please rectify my code and give some examples on this.

Posted 18-Aug-11 0:09am

raheemvali

Updated 18-Aug-11 0:42am

LittleYellowBird

v5

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nirav raval · Answer 1 · 2011-08-18T03:41:00

Solution 1

just try delay for loading image and clear it(i.e. rasterImageViewer1.Image=rc.load(nothing)... check the code, i didn't check it) before loading new image

not sure about the solution, but I face this sometime

Posted 18-Aug-11 3:41am

nirav raval

BillWoodruff · Answer 2 · 2011-08-18T13:15:00

I'm not clear if you are using a WinForm standard TreeView here, but, if you are, your code as shown should not compile:

1. TreeNode node = new TreeNode();

You create a new node here, but then never use it.

2. in your loop: root.Nodes.Add(subfileinfo[j].Name);

To add a new node to another node's TreeNodeCollection: you must create a new node in each iteration of the loop: here you are attempting to add a string, not a TreeNode, to the TreeNodeCollection of 'root.

You take it from here.