private DataGridViewSelectedRowCollection sourceRowCollection = null;

        private int rowIndexFromMouseDown;

        /// <summary>

        /// 用户拖动到机构里改变所属机构关系

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void dgvUser_MouseDown(object sender, MouseEventArgs e)

        {

            rowIndexFromMouseDown = dgvUser.HitTest(e.X, e.Y).RowIndex;

            if (rowIndexFromMouseDown != -)

            {

                if (this.dgvUser.SelectedRows.Count > )

                {

                    sourceRowCollection = this.dgvUser.SelectedRows;

                }

            }

            else

            {

                sourceRowCollection = null;

            }

        }

        private void dgvUser_MouseMove(object sender, MouseEventArgs e)

        {

            if (e.Button == MouseButtons.Left)

            {

                if (sourceRowCollection != null)

                {

                    DragDropEffects effect = this.dgvUser.DoDragDrop(sourceRowCollection, DragDropEffects.Move);

                    if (effect == DragDropEffects.Move)

                    {

                        //在sourceGrid中移除选中行

                        foreach (DataGridViewRow row in sourceRowCollection)

                        {

                            this.dgvUser.Rows.Remove(row);

                        }

                        sourceRowCollection = null;

                    }

                }

            }

        }

        private void tvwOrganize_DragDrop(object sender, DragEventArgs e)

        {

            try

            {

                if (e.Data.GetDataPresent(typeof(DataGridViewSelectedRowCollection)))

                {

                    DataGridViewSelectedRowCollection rowCollection = e.Data.GetData(typeof(DataGridViewSelectedRowCollection)) as DataGridViewSelectedRowCollection;

                    if (rowCollection == null)

                    {

                        return;

                    }

                    string userid = (rowCollection[].DataBoundItem as DataRowView).Row["UserID"].ToString();

                    string organizeid = (rowCollection[].DataBoundItem as DataRowView).Row["OrganizeID"].ToString();

                    Point p = this.tvwOrganize.PointToClient(new Point(e.X, e.Y));

                    TreeViewHitTestInfo hitTest = tvwOrganize.HitTest(p.X, p.Y);

                    Organize organize = hitTest.Node.Tag as Organize;

                    if (organizeid != organize.OrganizeID && userBiz.UpdateUserOrganize(userid, organize.OrganizeID))

                    {

                        e.Effect = DragDropEffects.Move;

                    }

                    else

                    { e.Effect = DragDropEffects.None; }

                }

            }

            catch (Exception ex)

            {

                e.Effect = DragDropEffects.None;

            }

        }

        private void tvwOrganize_DragOver(object sender, DragEventArgs e)

        {

            if (!e.Data.GetDataPresent(typeof(DataGridViewSelectedRowCollection)))

            {

                e.Effect = DragDropEffects.None;

                return;

            }

            else

            {

                e.Effect = DragDropEffects.Move;  //这个值会返回给DoDragDrop方法

            }

        }