C # Treeview

C # basic operations on contacts of the windows from control Treeview: Add new contacts, add sibling contacts, and delete contacts;
The implementation code is as follows:

Delete {treeView1.SelectedNode. Remove ()};

Add contacts:
Private void AddChildNode ()
{
If (treeView1.SelectedNode = null)
{
MessageBox. Show ("select a node", "message", MessageBoxButtons. OK, MessageBoxIcon. Information );
}
Else
{
// Create a Node object and initialize it
Try
{
ArrayList r = new ArrayList ();
Form3 f = new Form3 ();
F. ShowDialog (this );
TreeNode tmp = new TreeNode (f. textBox1.Text );
R. Add (f. textBox1.Text. ToString ());
R. Add (f. textBox2.Text. ToString ());
R. Add (f. textBox3.Text. ToString ());
R. Add (f. textBox4.Text. ToString ());
R. Add (f. textBox5.Text. ToString ());
R. Add (f. richTextBox1.Text. ToString ());
Tmp. Tag = r;
Tmp. Text = f. textBox1.Text;
ArrayList t = (ArrayList) this. treeView1.SelectedNode. Tag;
If (System. Convert. ToDateTime (f. textBox2.Text. ToString () <= System. Convert. ToDateTime (t [1]. ToString ()))
{
MessageBox. Show ("How is it possible! "," Message ", MessageBoxButtons. OK, MessageBoxIcon. Information );
}
Else
{
TreeView1.SelectedNode. Nodes. Add (tmp );
TreeView1.SelectedNode = tmp;
TreeView1.ExpandAll ();
}
}
Catch
{
MessageBox. Show ("Date entered correctly! "," Message ", MessageBoxButtons. OK, MessageBoxIcon. Information );
}
}

}
Private void AddParent ()
{
// First determine whether to select the node location in the component
If (treeView1.SelectedNode. Parent = null)
{
MessageBox. Show ("select a node", "message", MessageBoxButtons. OK, MessageBoxIcon. Information );
}
Else
{
Try
{
ArrayList r = new ArrayList ();
Form3 f = new Form3 ();
F. ShowDialog ();
R. Add (f. textBox1.Text. ToString ());
R. Add (f. textBox2.Text. ToString ());
R. Add (f. textBox3.Text. ToString ());
R. Add (f. textBox4.Text. ToString ());
R. Add (f. textBox5.Text. ToString ());
R. Add (f. richTextBox1.Text. ToString ());
TreeNode tmp = new TreeNode (f. textBox1.Text );
Tmp. Tag = r;
Tmp. Text = f. textBox1.Text;
ArrayList t = (ArrayList) this. treeView1.SelectedNode. Parent. Tag;
If (System. Convert. ToDateTime (f. textBox2.Text) <= System. Convert. ToDateTime (t [1]. ToString ()))
{
MessageBox. Show ("How is it possible! "," Message ", MessageBoxButtons. OK, MessageBoxIcon. Information );
}
Else
{
TreeView1.SelectedNode. Parent. Nodes. Add (tmp );
TreeView1.ExpandAll ();
}
}
Catch
{
MessageBox. Show ("Date entered correctly! "," Message ", MessageBoxButtons. OK, MessageBoxIcon. Information );
}
// Add a sibling node to the TreeView component
}
}
Traversal Algorithm:
Public TreeNode FindNode (TreeNode root, string strValue)
{
If (root = null)
Return null;
If (root. Text = strValue)
Return root;
TreeNode r = null;
Foreach (TreeNode node in root. Nodes)
{
R = FindNode (node, strValue );
If (r! = Null)
Break;
}
Return r;
}

Serialization to store TREEVIEW:
/// Class2 serializes the TreeView
/// Used for saving and reading files;
/// Write the file in binary format
Public class TreeViewDataAccess
{

/// TreeViewData
[Serializable ()]
Public struct TreeViewData
{
Public TreeNodeData [] Nodes;

/// Recursively initialize the TreeView data
Public TreeViewData (TreeView treeview)
{
Nodes = new TreeNodeData [treeview. Nodes. Count];
If (treeview. Nodes. Count = 0)
{
Return;
}
For (int I = 0; I <= treeview. Nodes. Count-1; I ++)
{
Nodes = new TreeNodeData (treeview. Nodes );
}
}
/// Use TreeViewData to pop up the TreeView
Public void PopulateTree (TreeView treeview)
{
If (this. Nodes = null | this. Nodes. Length = 0)
{
Return;
}
Treeview. BeginUpdate ();
For (int I = 0; I <= this. Nodes. Length-1; I ++)
{
Treeview. Nodes. Add (this. Nodes. ToTreeNode ());
}
Treeview. EndUpdate ();
}
}

/// TreeNodeData
[Serializable ()]
Public struct TreeNodeData
{
Public string Text;
Public int ImageIndex;
Public int SelectedImageIndex;
Public bool Checked;
Public bool Expanded;
Public object Tag;
Public Color BackColor;
Public TreeNodeData [] Nodes;
/// TreeNode Constructor
Public TreeNodeData (TreeNode node)
{
This. Text = node. Text;
This. ImageIndex = node. ImageIndex;
This. SelectedImageIndex = node. SelectedImageIndex;
This. Checked = node. Checked;
This. BackColor = node. BackColor;
This. Expanded = node. IsExpanded;
This. Nodes = new TreeNodeData [node. Nodes. Count];
This. Tag = node. Tag;
If (node. Nodes. Count = 0)
{
Return;
}
For (int I = 0; I <= node. Nodes. Count-1; I ++)
{
Nodes = new TreeNodeData (node. Nodes );
}
}
/// TreeNodeData returns TreeNode
Public TreeNode ToTreeNode ()
{
TreeNode ToTreeNode = new TreeNode (this. Text, this. ImageIndex, this. SelectedImageIndex );
ToTreeNode. Checked = this. Checked;
ToTreeNode. BackColor = this. BackColor;
ToTreeNode. Tag = this. Tag;
If (this. Expanded)
{
ToTreeNode. Expand ();
}
If (this. Nodes = null & this. Nodes. Length = 0)
{
Return null;
}
If (ToTreeNode! = Null & this. Nodes. Length = 0)
{
Return ToTreeNode;
}
For (int I = 0; I <= this. Nodes. Length-1; I ++)
{
ToTreeNode. Nodes. Add (this. Nodes. ToTreeNode ());
}
Return ToTreeNode;
}
}
/// Load the TreeView
Public static void LoadTreeViewData (TreeView treeView, string path)
{
Try
{
BinaryFormatter ser = new BinaryFormatter ();
Stream file = new FileStream (path, FileMode. Open, FileAccess. Read, FileShare. Read );
TreeViewData treeData = (TreeViewData) (ser. Deserialize (file )));
TreeData. PopulateTree (treeView );
File. Close ();
}
Catch
{}
}
/// Save the TreeView to the file
Public static void SaveTreeViewData (TreeView treeView, string path)
{
Try
{
BinaryFormatter ser = new BinaryFormatter ();
Stream file = new FileStream (path, FileMode. Create );
Ser. Serialize (file, new TreeViewData (treeView ));
File. Close ();
}
Catch
{
}
}
}
}