How to add child node into TreeView?

Hi, I currently have a Treeview which populates something like this
-X01
   -product
      -hardware
         - brand
              alpha
              beta
+X02
I'm connecting to another database for the last node.Due to the heavy load in the database i've decided to load it after the afterselect event.Like the code I've included.

What I aim to achieve is something like this...
-X01
   -product
      -hardware
         - brand
              -alpha
                  -alpha.101(read from new database)
                  -alpha.102(read from new database)
              beta
+X02

I hope someone can help me out.And i'm not very proficient in my programming so I'd appreciate it if your solution come in codes thanks in advance.
private void treeview1_AfterSelect(object sender, TreeViewEventArgs e)
        {
            if (e.Node.Level != 4)
            { return; }
            else
            {
                    localSQL = "SELECT KEYID,PRODUCT_NAME,PRODUCT_DESC,PKEYID,PRODUCT_TYPE FROM PRODUCT_PT WHERE PKEYID LIKE '" + treeview1.SelectedNode.Name + "'";
                    OracleCommand cmdOracle = new OracleCommand(localSQL, localConnection);
                    cmdOracle.CommandType = CommandType.Text;
                    OracleDataReader drO= cmdOracle.ExecuteReader();
                    while (drO.Read())
                    {
                    // Add node...???
                    }
                    drOracle.Close();
            }
        }

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csharp_learnerAsked:
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prakhardeepConnect With a Mentor Commented:
You cannot add a treeview (line 1) to treenode (line 3).

Try the following:


TreeNode node = new TreeNode();
node.Text = drOracle.GetOracleValue(4).ToString();
e.Node.Nodes.Add(node);

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Gautham JanardhanCommented:
is this WPF ? then
while (drO.Read())
{
TreeViewItem Item = new TreeViewItem();
Item.Content = "Ur Text";
e.Node.Items.Add(Item);
}

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SaedSalmanCommented:

while (drO.Read())
{
TreeViewItem item = new TreeViewItem();
Item.Content = "Text to add";  //if SELECT result then:drO[0].ToString()
treeview1.Node.Items.Add(item);
}

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csharp_learnerAuthor Commented:
Sorry to left  it out, but this is C# win forms.
I tried the following code but there are errors on the 3rd line...
                        TreeView item = new TreeView();
                        item = drOracle.GetOracleString(1).ToString();
                        treeview1.Node.item.Add(item);
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Gautham JanardhanCommented:

 item.Text = drOracle.GetOracleString(1).ToString();
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csharp_learnerAuthor Commented:
item.Text cannot be found in the list only Name can be found and i used it but line 3 is still in error.
Thanks for your reply.
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Gautham JanardhanCommented:
treeview1.Nodes.Add(Item);
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csharp_learnerAuthor Commented:
I tried using
                            TreeView item = new TreeView();
                            item.Name = drOracle.GetOracleValue(4).ToString();
                            treeview1.Nodes.Add(item);

But 2 compile errors came out,both is based on line 3.

1.The best overloaded method match for 'System.Windows.Forms.TreeNodeCollection.Add(System.Windows.Forms.TreeNode)' has some invalid arguments.

2.Argument '1': cannot convert from 'System.Windows.Forms.TreeView' to 'System.Windows.Forms.TreeNode'
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csharp_learnerAuthor Commented:
Exactly what i was looking for Thanks.
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