C#

currentNode = new TreeNode(Path.GetFullPath(ofd.FileName));
currentNode.Tag = Path.GetFullPath(ofd.FileName);
if(CheckNode(currentNode)){

private bool CheckNode(TreeNode node)
{
  string test = (string) node.Tag;
  foreach (TreeNode n in treeView1.Nodes)
    //we compare string to string here
    if (n.Tag == node.Tag)
      return false;
  //no matches found
  return true;
}

<br />
using System;<br />
using System.Resources;<br />
<br />
public class SampleClass<br />
{<br />
    public static void Main()<br />
    {<br />
        // Create a resource writer.<br />
        IResourceWriter rw = new ResourceWriter("MyResources.resources");<br />
        // Add resources to the file.<br />
        rw.AddResource(@"C:\myPrograms\NetText\icons\icon_10.ico", "Stop");<br />
        rw.AddResource(@"C:\myPrograms\NetText\icons\Icon_Question.ico", "Question");<br />
        rw.AddResource(@"C:\myPrograms\NetText\icons\Icon_14.ico", "Folder");<br />
        // Close the ResourceWriter.<br />
        rw.Close();<br />
    }<br />
}<br />
/*using System;<br />
using System.Resources;<br />
using System.Collections;<br />
 <br />
public class ReadResources {<br />
<br />
   public static void Main(string[] args) {<br />
<br />
      // Opens a resource reader and gets an enumerator from it.<br />
      IResourceReader reader = new ResourceReader("myResources.resources");<br />
      IDictionaryEnumerator en = reader.GetEnumerator();<br />
      <br />
      // Goes through the enumerator, printing out the key and value pairs.<br />
      while (en.MoveNext()) {<br />
         Console.WriteLine();<br />
         Console.WriteLine("Name: {0}", en.Key);//this will display raw directory<br />
         Console.WriteLine("Value: {0}", en.Value);//this will display Name (such as \"Stop\", or \"Folder\")<br />
      }<br />
      reader.Close();<br />
   }<br />
}*/<br />

Assembly ass = Assembly.GetCallingAssembly();
Stream strm = ass.GetManifestResourceStream("MyResourceFile.resources");
IResourceReader rr = new ResourceReader(strm);
IDictionaryEnumerator de = rr.GetEnumerator();
while (de.MoveNext())
{
// Process Resources here
}