TreeViewをDataTableにバインドしている場合に、ドラッグ＆ドロップによって1つ目のTreeViewから他のTreeViewにノードをコピーするには、C1TreeViewのDragEnter、DragDrop、およびItemDragイベントを利用し、DataRowのAdd、InsertAtメソッドを用いてノードの追加、挿入を行う方法が考えられます。

以下に、左側のTreeViewから右側のTreeViewへノードをコピーするための簡単な実装例を記載します。



◎サンプルコード（VB）

Imports C1.Win.TreeView

Public Class Form1
    Dim dataTable1 As DataTable = New DataTable("DataTable1")
    Dim dataTable2 As DataTable = New DataTable("DataTable2")

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        C1TreeView1.AllowDrop = True
        C1TreeView2.AllowDrop = True

        ' c1TreeView1 - DataTableの設定
        dataTable1.Columns.Add("Column0", GetType(Int32))
        dataTable1.Columns.Add("Column1", GetType(Int32))
        dataTable1.Columns.Add("Column2", GetType(Int32))
        dataTable1.Columns.Add("Data01", GetType(String))
        dataTable1.Rows.Add(0, 0, -1, "NodeA1")
        dataTable1.Rows.Add(1, 1, 0, "NodeA00")
        dataTable1.Rows.Add(2, 2, 0, "NodeA01")
        dataTable1.Rows.Add(3, 3, 0, "NodeA02")
        dataTable1.Rows.Add(4, 4, 0, "NodeA03")
        dataTable1.Rows.Add(5, 5, 0, "NodeA04")
        dataTable1.AcceptChanges()

        ' c1TreeView1 - BindingInfoの設定
        Dim info As BindingInfo = C1TreeView1.BindingInfo
        info.KeyField = dataTable1.Columns(1).ColumnName
        info.ParentKeyField = dataTable1.Columns(2).ColumnName
        info.BindingMode = BindingMode.TwoWay
        info.DataMember = dataTable1.Columns(3).ColumnName
        info.DataSource = dataTable1
        C1TreeView1.Columns(0).DisplayFieldName = dataTable1.Columns(3).ColumnName
        C1TreeView1.AllowEditing = True
        C1TreeView1.EditMode = C1TreeViewEditMode.EditOnEnter
        C1TreeView1.ExpandAll()

        ' c1TreeView2 - DataTableの設定
        dataTable2.Columns.Add("Column20", GetType(Int32))
        dataTable2.Columns.Add("Column21", GetType(Int32))
        dataTable2.Columns.Add("Column22", GetType(Int32))
        dataTable2.Columns.Add("Data02", GetType(String))
        dataTable2.Rows.Add(0, 0, -1, "NodeB1")
        dataTable2.Rows.Add(1, 1, 0, "NodeB00")
        dataTable2.Rows.Add(2, 2, 0, "NodeB01")
        dataTable2.Rows.Add(3, 3, 0, "NodeB02")
        dataTable2.Rows.Add(4, 4, 0, "NodeB03")
        dataTable2.Rows.Add(5, 5, 0, "NodeB04")
        dataTable2.AcceptChanges()

        ' c1TreeView2 - BindingInfoの設定
        Dim info2 As BindingInfo = C1TreeView2.BindingInfo
        info2.KeyField = dataTable2.Columns(1).ColumnName
        info2.ParentKeyField = dataTable2.Columns(2).ColumnName
        info2.BindingMode = BindingMode.TwoWay
        info2.DataMember = dataTable2.Columns(3).ColumnName
        info2.DataSource = dataTable2
        C1TreeView2.Columns(0).DisplayFieldName = dataTable2.Columns(3).ColumnName
        C1TreeView2.AllowEditing = True
        C1TreeView2.EditMode = C1TreeViewEditMode.EditOnEnter
        C1TreeView2.ExpandAll()

        AddHandler C1TreeView1.ItemDrag, AddressOf C1TreeView_ItemDrag
        AddHandler C1TreeView2.ItemDrag, AddressOf C1TreeView_ItemDrag
        AddHandler C1TreeView1.DragEnter, AddressOf C1TreeView_DragEnter
        AddHandler C1TreeView2.DragEnter, AddressOf C1TreeView_DragEnter
        AddHandler C1TreeView1.DragDrop, AddressOf C1TreeView_DragDrop
        AddHandler C1TreeView2.DragDrop, AddressOf C1TreeView_DragDrop
    End Sub

    Private Sub C1TreeView_DragDrop(ByVal sender As Object, ByVal e As DragEventArgs)
        Dim treeView = CType(sender, C1TreeView)

        If (TryCast((treeView.BindingInfo.DataSource), DataTable)).TableName = "DataTable2" Then
            treeView.BeginUpdate()
            Dim distanceNodes = CType(e.Data.GetData(GetType(C1TreeNode())), C1TreeNode())
            Dim distanceNode = distanceNodes(0)
            Dim dropPoint = treeView.PointToClient(New Point(e.X, e.Y))
            Dim pos = CType(e.Data.GetData(GetType(DragDropPosition)), DragDropPosition)
            Dim rowsCount = dataTable2.Rows.Count
            Dim item = (TryCast(distanceNode.GetValue(), DataRow)).ItemArray(3)
            Dim currentNode = treeView.GetNodeAtPoint(dropPoint)

            If currentNode IsNot Nothing Then
                Dim index = CInt((TryCast(currentNode.GetValue(), DataRow)).ItemArray(1))
                Dim desRow = dataTable2.NewRow()

                Select Case pos
                    Case DragDropPosition.After

                        For i As Integer = index + 1 To dataTable2.Rows.Count - 1
                            dataTable2.Rows(i).SetField(Of Integer)(0, i + 1)
                            dataTable2.Rows(i).SetField(Of Integer)(1, i + 1)
                        Next

                        desRow.ItemArray = {index + 1, index + 1, (TryCast(currentNode.GetValue(), DataRow)).ItemArray(2), item}
                        dataTable2.Rows.InsertAt(desRow, index + 1)
                    Case DragDropPosition.Before

                        For i As Integer = index To dataTable2.Rows.Count - 1
                            dataTable2.Rows(i).SetField(Of Integer)(0, i + 1)
                            dataTable2.Rows(i).SetField(Of Integer)(1, i + 1)
                        Next

                        desRow.ItemArray = {index, index, (TryCast(currentNode.GetValue(), DataRow)).ItemArray(2), item}
                        dataTable2.Rows.InsertAt(desRow, index)
                    Case DragDropPosition.Inner
                        dataTable2.Rows.Add(rowsCount, rowsCount, (TryCast(currentNode.GetValue(), DataRow)).ItemArray(1), item)
                End Select
            Else
                dataTable2.Rows.Add(rowsCount, rowsCount, -1, item)
            End If

            dataTable2.AcceptChanges()
            treeView.EndUpdate()
            treeView.ExpandAll()
        End If
    End Sub

    Private Sub C1TreeView_DragEnter(ByVal sender As Object, ByVal e As DragEventArgs)
        e.Effect = DragDropEffects.Move
    End Sub

    Private Sub C1TreeView_ItemDrag(ByVal sender As Object, ByVal e As C1.Win.TreeView.C1TreeViewItemDragEventArgs)
        DoDragDrop(e.DraggedData, DragDropEffects.Move)
    End Sub
End Class

◎サンプルコード（C#）

using C1.Win.TreeView;

namespace prj_TreeView
{
    public partial class Form1 : Form
    {
        DataTable dataTable1 = new DataTable("DataTable1");
        DataTable dataTable2 = new DataTable("DataTable2");
        public Form1()
        {
            InitializeComponent();

            c1TreeView1.AllowDrop = true;
            c1TreeView2.AllowDrop = true;
            c1TreeView1.ItemDrag += C1TreeView_ItemDrag;
            c1TreeView2.ItemDrag += C1TreeView_ItemDrag;
            c1TreeView1.DragEnter += C1TreeView_DragEnter;
            c1TreeView2.DragEnter += C1TreeView_DragEnter;
            c1TreeView1.DragDrop += C1TreeView_DragDrop;
            c1TreeView2.DragDrop += C1TreeView_DragDrop;
        }


        private void Form1_Load_1(object sender, EventArgs e)
        {
            // c1TreeView1 - DataTableの設定
            dataTable1.Columns.Add("Column0", typeof(Int32));
            dataTable1.Columns.Add("Column1", typeof(Int32));
            dataTable1.Columns.Add("Column2", typeof(Int32));
            dataTable1.Columns.Add("Data01", typeof(String));
            dataTable1.Rows.Add(0, 0, -1, "NodeA1");
            dataTable1.Rows.Add(1, 1, 0, "NodeA00");
            dataTable1.Rows.Add(2, 2, 0, "NodeA01");
            dataTable1.Rows.Add(3, 3, 0, "NodeA02");
            dataTable1.Rows.Add(4, 4, 0, "NodeA03");
            dataTable1.Rows.Add(5, 5, 0, "NodeA04");
            dataTable1.AcceptChanges();

            // c1TreeView1 - BindingInfoの設定
            BindingInfo info = c1TreeView1.BindingInfo;
            info.KeyField = dataTable1.Columns[1].ColumnName;
            info.ParentKeyField = dataTable1.Columns[2].ColumnName;
            info.BindingMode = BindingMode.TwoWay;
            info.DataMember = dataTable1.Columns[3].ColumnName;
            info.DataSource = dataTable1;
            c1TreeView1.Columns[0].DisplayFieldName = dataTable1.Columns[3].ColumnName;
            c1TreeView1.AllowEditing = true;
            c1TreeView1.EditMode = C1TreeViewEditMode.EditOnEnter;
            c1TreeView1.ExpandAll();

            // c1TreeView2 - DataTableの設定
            dataTable2.Columns.Add("Column20", typeof(Int32));
            dataTable2.Columns.Add("Column21", typeof(Int32));
            dataTable2.Columns.Add("Column22", typeof(Int32));
            dataTable2.Columns.Add("Data02", typeof(String));
            dataTable2.Rows.Add(0, 0, -1, "NodeB1");
            dataTable2.Rows.Add(1, 1, 0, "NodeB00");
            dataTable2.Rows.Add(2, 2, 0, "NodeB01");
            dataTable2.Rows.Add(3, 3, 0, "NodeB02");
            dataTable2.Rows.Add(4, 4, 0, "NodeB03");
            dataTable2.Rows.Add(5, 5, 0, "NodeB04");
            dataTable2.AcceptChanges();

            // c1TreeView2 - BindingInfoの設定
            BindingInfo info2 = c1TreeView2.BindingInfo;
            info2.KeyField = dataTable2.Columns[1].ColumnName;
            info2.ParentKeyField = dataTable2.Columns[2].ColumnName;
            info2.BindingMode = BindingMode.TwoWay;
            info2.DataMember = dataTable2.Columns[3].ColumnName;
            info2.DataSource = dataTable2;
            c1TreeView2.Columns[0].DisplayFieldName = dataTable2.Columns[3].ColumnName;
            c1TreeView2.AllowEditing = true;
            c1TreeView2.EditMode = C1TreeViewEditMode.EditOnEnter;
            c1TreeView2.ExpandAll();
        }

        private void C1TreeView_DragDrop(object sender, DragEventArgs e)
        {
            var treeView = (C1TreeView)sender;
            if (((treeView.BindingInfo.DataSource) as DataTable).TableName == "DataTable2")
            {
                treeView.BeginUpdate();
                var distanceNodes = (C1TreeNode[])e.Data.GetData(typeof(C1TreeNode[]));
                var distanceNode = distanceNodes[0];
                var dropPoint = treeView.PointToClient(new Point(e.X, e.Y));
                var pos = (DragDropPosition)e.Data.GetData(typeof(DragDropPosition));
                var rowsCount = dataTable2.Rows.Count;
                var item = (distanceNode.GetValue() as DataRow).ItemArray[3];

                var currentNode = treeView.GetNodeAtPoint(dropPoint);               
                if (currentNode != null)
                {
                    var index = (int)(currentNode.GetValue() as DataRow).ItemArray[1];

                    var desRow = dataTable2.NewRow();
                    switch (pos)
                    {
                        case DragDropPosition.After:                            
                            for (int i = index+1; i < dataTable2.Rows.Count;i++)
                            {
                                dataTable2.Rows[i].SetField(0, i + 1);
                                dataTable2.Rows[i].SetField(1, i + 1);
                            }
                            desRow.ItemArray = new[] { index + 1, index + 1, (currentNode.GetValue() as DataRow).ItemArray[2], item };
                            dataTable2.Rows.InsertAt(desRow,index+1);                            
                            break;
                        case DragDropPosition.Before:
                            for (int i = index; i < dataTable2.Rows.Count;i++)
                            {
                                dataTable2.Rows[i].SetField(0, i+1);
                                dataTable2.Rows[i].SetField(1, i+1); 
                            }
                            desRow.ItemArray = new[] { index, index, (currentNode.GetValue() as DataRow).ItemArray[2], item };
                            dataTable2.Rows.InsertAt(desRow,index);
                            
                            break;
                        case DragDropPosition.Inner:
                            dataTable2.Rows.Add(rowsCount, rowsCount, (currentNode.GetValue() as DataRow).ItemArray[1], item);
                            break;
                    }
                }
                else
                {
                    dataTable2.Rows.Add(rowsCount, rowsCount, -1, item);
                }
                dataTable2.AcceptChanges();
                treeView.EndUpdate();
                treeView.ExpandAll();
            }
        }

        private void C1TreeView_DragEnter(object sender, DragEventArgs e)
        {
            e.Effect = DragDropEffects.Move;
        }

        private void C1TreeView_ItemDrag(object sender, C1.Win.TreeView.C1TreeViewItemDragEventArgs e)
        {
            DoDragDrop(e.DraggedData, DragDropEffects.Move);
        }

    }
}