求 DataGridview Row 资料任意上下移动对调,该怎么解决

求 DataGridview Row 资料任意上下移动对调
请问前辈们:我有一个 DataGridview 里面假设有 6笔资料 3攔

  A B C
1
2
3
4
5
6

我要如何做到用鼠标将这6笔资料任意上下移动对调呢?  
那里有范例可以看呢?感谢~

[解决办法]
参考
[解决办法]

C# code

   /// <summary>        /// 上一一条数据        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void btn_up_Click(object sender, EventArgs e)        {            if (dgvCaseStateManage.SelectedRows.Count == 0)            {                CommonApp.FormMessageBox.Show(CommonApp.LoadMode.Prompt, "请选择要移动的数据");                this.Focus();                return;            }            int rowindex = dgvCaseStateManage.SelectedRows[0].Index;            if (rowindex > 0)            {                mo.Csm_ID = dgvCaseStateManage.SelectedRows[0].Cells[0].Value.ToString();                mo.Csm_Oderid = int.Parse(dgvCaseStateManage.SelectedRows[0].Cells[2].Value.ToString());                model.Csm_ID = this.dgvCaseStateManage.Rows[rowindex - 1].Cells[0].Value.ToString();                model.Csm_Oderid = int.Parse(this.dgvCaseStateManage.Rows[rowindex - 1].Cells[2].Value.ToString());                opCaseState.Move(mo, model);                GetAllWorkInfo();                foreach (DataGridViewRow dgvr in dgvCaseStateManage.SelectedRows)                {                    dgvr.Selected = false;                }                dgvCaseStateManage.Rows[rowindex - 1].Selected = true;                dgvCaseStateManage.CurrentCell = dgvCaseStateManage.Rows[rowindex - 1].Cells[1];            }        }        /// <summary>        /// 下一一条数据        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void btn_down_Click(object sender, EventArgs e)        {            DataTable dt = (DataTable)dgvCaseStateManage.DataSource;            if (dgvCaseStateManage.SelectedRows.Count == 0)            {                CommonApp.FormMessageBox.Show(CommonApp.LoadMode.Prompt, "请选择要移动的数据");                this.Focus();                return;            }            int rowindex = dgvCaseStateManage.SelectedRows[0].Index;            if (rowindex < dt.Rows.Count - 1)            {                mo.Csm_ID = dgvCaseStateManage.SelectedRows[0].Cells[0].Value.ToString();                mo.Csm_Name = dgvCaseStateManage.SelectedRows[0].Cells[1].Value.ToString();                mo.Csm_Oderid = int.Parse(dgvCaseStateManage.SelectedRows[0].Cells[2].Value.ToString());                model.Csm_ID = this.dgvCaseStateManage.Rows[rowindex + 1].Cells[0].Value.ToString();                model.Csm_Oderid = int.Parse(this.dgvCaseStateManage.Rows[rowindex + 1].Cells[2].Value.ToString());                opCaseState.Move(mo, model);                GetAllWorkInfo();                foreach (DataGridViewRow dgvr in dgvCaseStateManage.SelectedRows)                {                    dgvr.Selected = false;                }                dgvCaseStateManage.Rows[rowindex + 1].Selected = true;                dgvCaseStateManage.CurrentCell = dgvCaseStateManage.Rows[rowindex + 1].Cells[1];            }        }"update CaseStateManage set Csm_Oderid='{0}' where  Csm_ID= '{1}'";