How to drag and drop the selected rows from grid into MultiColumnTreeView control in WinForms GridGroupingControl?

//Event Subscription
this.gridGroupingControl1.TableControlMouseDown += gridGroupingControl1_TableControlMouseDown;
 
//Event Customization
void gridGroupingControl1_TableControlMouseDown(object sender,GridTableControlMouseEventArgs e)
{
    GridGroupingControl grid = sender as GridGroupingControl;
              
    if (grid != null)
    {
        GridTableControl tableControl = grid.TableControl;
        Point pt = new Point(e.Inner.X, e.Inner.Y);
        int row, col;
        if (tableControl.PointToRowCol(pt, out row, out col))
        {
            GridTableCellStyleInfo style = tableControl.Model[row, col];
            //checks if the cell in which the MouseDown event is a RecordRowHeaderCell.
            //If yes, then begins the DragDrop operation.
            if ((style.TableCellIdentity.TableCellType == GridTableCellType.RecordRowHeaderCell
                 || style.TableCellIdentity.TableCellType == GridTableCellType.AlternateRecordRowHeaderCell)
                 && style.TableCellIdentity.DisplayElement.ParentRecord != null 
                 && style.TableCellIdentity.DisplayElement.ParentRecord.IsSelected())
            {
                DragDropEffects ef = tableControl.DoDragDrop(new DataObject(grid.Table.SelectedRecords), DragDropEffects.Copy);
 
                //Adding the Selected records to the temp collection.
                Record[] recordArray = new Record[this.gridGroupingControl1.Table.SelectedRecords.Count];
                this.gridGroupingControl1.Table.SelectedRecords.CopyTo(recordArray, 0);                       
                clonedRecords = recordArray.ToList();
 
                if (ef == DragDropEffects.Move)
                {
                    //need to delete selection if you want to support this.
                }
            }
        }
    }
}

'Event Subscription
AddHandler Me.gridGroupingControl1.TableControlMouseDown, AddressOf gridGroupingControl1_TableControlMouseDown
 
'Event Customization
Private Sub gridGroupingControl1_TableControlMouseDown(ByVal sender As Object, ByVal e As GridTableControlMouseEventArgs)
    Dim grid As GridGroupingControl = TryCast(sender, GridGroupingControl)
    If grid IsNot Nothing Then
        Dim tableControl As GridTableControl = grid.TableControl
        Dim pt As New Point(e.Inner.X, e.Inner.Y)
        Dim row, col As Integer
        If tableControl.PointToRowCol(pt, row, col) Then
            Dim style As GridTableCellStyleInfo = tableControl.Model(row, col)
            'checks if the cell in which the MouseDown event is a RecordRowHeaderCell.
            'If yes, then begins the DragDrop operation.
             If (style.TableCellIdentity.TableCellType = GridTableCellType.RecordRowHeaderCell OrElse style.TableCellIdentity.TableCellType = GridTableCellType.AlternateRecordRowHeaderCell) AndAlso style.TableCellIdentity.DisplayElement.ParentRecord IsNot Nothing AndAlso style.TableCellIdentity.DisplayElement.ParentRecord.IsSelected() Then
                Dim ef As DragDropEffects = tableControl.DoDragDrop(New DataObject(grid.Table.SelectedRecords), DragDropEffects.Copy)
                'Adding the Selected records to the temp collection.
                Dim recordArray(Me.gridGroupingControl1.Table.SelectedRecords.Count - 1) As Record
                Me.gridGroupingControl1.Table.SelectedRecords.CopyTo(recordArray, 0)
                clonedRecords = recordArray.ToList()
                 If ef = DragDropEffects.Move Then
                     'need to delete selection if you want to support this.
                 End If
          End If
        End If
    End If
End Sub

//Event Subscription
this.multiColumnTreeView1.DragDrop += multiColumnTreeView1_DragDrop;
 
  //Event customization
  void multiColumnTreeView1_DragDrop(object sender, DragEventArgs e)
  {
      SelectedRecordsCollection recs = e.Data.GetData(typeof(SelectedRecordsCollection)) as SelectedRecordsCollection;
      if (recs != null)
      {
          TreeColumnAdvCollection collection  = this.multiColumnTreeView1.Columns;
          Syncfusion.Windows.Forms.Tools.MultiColumnTreeView.TreeNodeAdv[] item = new Syncfusion.Windows.Forms.Tools.MultiColumnTreeView.TreeNodeAdv[collection.Count];
          TreeNodeAdvSubItem[] subItems =new TreeNodeAdvSubItem[collection.Count];
                        
          foreach (SelectedRecord record in recs)
          {
              Record rec = record.Record;
 
              for (int i = 0; i < collection.Count; i++)
              {
                  string name = collection[i].Text;
                  if (i == 0)
                  {
                      item[i] = new Syncfusion.Windows.Forms.Tools.MultiColumnTreeView.TreeNodeAdv();
                      item[i].Text = rec[name].ToString();
                      item[i].HelpText = rec[name].ToString();
                  }
                  else if (i > 0)
                  {
                      subItems[i] = new TreeNodeAdvSubItem();
                      subItems[i].Text = rec[name].ToString();
                      subItems[i].HelpText = rec[name].ToString();
                      item[0].SubItems.Add(subItems[i]);
                  }
              }
              this.multiColumnTreeView1.Nodes.Add(item[0]);
          }
      }
      
  }

'Event Subscription
AddHandler Me.multiColumnTreeView1.DragDrop, AddressOf multiColumnTreeView1_DragDrop
 
'Event customization
Private Sub multiColumnTreeView1_DragDrop(ByVal sender As Object, ByVal e As DragEventArgs)
    Dim recs As SelectedRecordsCollection = TryCast(e.Data.GetData(GetType(SelectedRecordsCollection)), 
    If recs IsNot Nothing Then
        Dim collection As TreeColumnAdvCollection = Me.multiColumnTreeView1.Columns
        Dim item(collection.Count - 1) As Syncfusion.Windows.Forms.Tools.MultiColumnTreeView.TreeNodeAdv
        Dim subItems(collection.Count - 1) As TreeNodeAdvSubItem
        For Each record As SelectedRecord In recs
            Dim rec As Record = record.Record
            For i As Integer = 0 To collection.Count - 1
                Dim name As String = collection(i).Text
                If i = 0 Then
                    item(i) = New Syncfusion.Windows.Forms.Tools.MultiColumnTreeView.TreeNodeAdv()
                    item(i).Text = rec(name).ToString()
                    item(i).HelpText = rec(name).ToString()
                ElseIf i > 0 Then
                    subItems(i) = New TreeNodeAdvSubItem()
                    subItems(i).Text = rec(name).ToString()
                    subItems(i).HelpText = rec(name).ToString()
                    item(0).SubItems.Add(subItems(i))
                End If
            Next i
            Me.multiColumnTreeView1.Nodes.Add(item(0))
        Next record
    End If
 
End Sub

//Event Subscription
this.multiColumnTreeView1.DragEnter += multiColumnTreeView1_DragEnter;
 
//Event Customization
void multiColumnTreeView1_DragEnter(object sender, DragEventArgs e)
{
    if (e.Data.GetDataPresent(typeof(SelectedRecordsCollection)))
        e.Effect = DragDropEffects.Copy;
    else
        e.Effect = DragDropEffects.None;
}

'Event Subscription
AddHandler Me.multiColumnTreeView1.DragEnter, AddressOf multiColumnTreeView1_DragEnter
 
'Event Customization
Private Sub multiColumnTreeView1_DragEnter(ByVal sender As Object, ByVal e As DragEventArgs)
    If e.Data.GetDataPresent(GetType(SelectedRecordsCollection)) Then
        e.Effect = DragDropEffects.Copy
    Else
        e.Effect = DragDropEffects.None
    End If
End Sub