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        private DataGridViewBehavior _GridBehavior1;
        private DataGridViewBehavior _GridBehavior2;
        private void toolStripButton5_Click(object sender, EventArgs e)
        {
            _GridBehavior1 = new DataGridViewBehavior();
            _GridBehavior1.Attach(dataGridView1);
            _GridBehavior2 = new DataGridViewBehavior();
            _GridBehavior2.Attach(dataGridView2);
            _GridBehavior1.Enabled = true;
            _GridBehavior2.Enabled = true;

        }


        public class DataGridViewBehavior
        {      
            private string[,] _Data;
            private DataGridView _Grid;
            private DataGridView.HitTestInfo _HitTest;
            private Point _HitTestPoint;
            private Rectangle _DragBox;
            public bool Enabled { get; set; }

            public void Attach(DataGridView grid)
            {
                _Grid = grid;
                _Data = new string[_Grid.RowCount, _Grid.ColumnCount];
                _Grid.MouseDown += _MouseDown;
                _Grid.MouseMove += _MouseMove;
                _Grid.VirtualMode = true;
                _Grid.AllowUserToAddRows = false;
                _Grid.AllowDrop = true;
                _Grid.DragOver += _DragOver;
                
                _Grid.DragDrop += _DragDrop;
                _Grid.CellValuePushed += (s, e) => _Data[e.RowIndex, e.ColumnIndex] = Convert.ToString(e.Value);
                _Grid.CellValueNeeded += (s, e) => e.Value = _Data[e.RowIndex, e.ColumnIndex];
            }
            
            void _DragDrop(object sender, DragEventArgs e)
            {
                if (Enabled == true)
                {
                    Point p = _Grid.PointToClient(new Point(e.X, e.Y));
                    var ht = _Grid.HitTest(p.X, p.Y);
                    if (ht.Type != DataGridViewHitTestType.Cell)
                        return;
                    if (e.Data.GetDataPresent(DataFormats.Text, true))
                    {
                        var data = e.Data.GetData(DataFormats.Text, true);
                        _Grid.Rows[ht.RowIndex].Cells[ht.ColumnIndex].Value = data;
                    }
                }                
            }

            void _DragOver(object sender, DragEventArgs e)
            {
                if (!e.Data.GetDataPresent(typeof(System.String)))
                {
                    e.Effect = DragDropEffects.None;
                    return;
                }              
                if ((e.KeyState & 4) == 4 && (e.AllowedEffect & DragDropEffects.Move) == DragDropEffects.Move)
                {
                    e.Effect = DragDropEffects.Move;
                }
                else if ((e.KeyState & 8) == 8 && (e.AllowedEffect & DragDropEffects.Copy) == DragDropEffects.Copy)
                {
                    e.Effect = DragDropEffects.Copy;
                }
                else if ((e.AllowedEffect & DragDropEffects.Move) == DragDropEffects.Move)
                {
                    e.Effect = DragDropEffects.Move;
                }
                else
                    e.Effect = DragDropEffects.None; 
            }            
            
            void _MouseDown(object sender, MouseEventArgs e)
            {
                if (Enabled == true)
                {
                    var ht = _Grid.HitTest(e.X, e.Y);
                    if (ht.Type == DataGridViewHitTestType.Cell)
                    {
                        _HitTest = ht;
                        _HitTestPoint = e.Location;
                        _DragBox = new Rectangle(new Point(e.X - (SystemInformation.DragSize.Width / 2), e.Y - (SystemInformation.DragSize.Height / 2)),
                            SystemInformation.DragSize);
                    }
                    else
                        _HitTest = DataGridView.HitTestInfo.Nowhere;
                }
            }
            void _MouseMove(object sender, MouseEventArgs e)
            {
                if (Enabled == true)
                {
                    if (((e.Button & MouseButtons.Left) != MouseButtons.Left)
                        || _HitTest == DataGridView.HitTestInfo.Nowhere
                        || _DragBox.Contains(e.X, e.Y))
                        return;
                    var data = _Grid.Rows[_HitTest.RowIndex].Cells[_HitTest.ColumnIndex].Value;
                    if (data != null)
                        _Grid.DoDragDrop(data, DragDropEffects.All);                
                }
            }
        }