for (int i = 0; i < dgv_DaoYouGuanLi.Rows.Count; i++)
                    {
                        if (dgv_DaoYouGuanLi.Rows[i].Cells["选择"].Selected==true)
                        {
                            string ZdyId = dgv_DaoYouGuanLi.Rows[i].Cells["ZdyId"].Value.ToString().Trim();
                            string sql = B_XT.delDY(ZdyId);
                            bool flag = TranClass.RunTran(sql);
                            if (flag)
                            {
                                dgv_DaoYouGuanLi.Rows.RemoveAt(dgv_DaoYouGuanLi.Rows[i].Index);
                            }
                            else
                            {
                                MessageBox.Show("删除出现异常，请重新删除！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
                            }
                        }
                    }

       for (int i = 0; i < dataGridView1.Rows.Count; i++)
            {

                DataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell)dataGridView1.Rows[i].Cells["选择"];
                if ((Boolean)chk.EditedFormattedValue == true)
                {
 string ZdyId = dgv_DaoYouGuanLi.Rows[i].Cells["ZdyId"].Value.ToString().Trim();
                            string sql = B_XT.delDY(ZdyId);
                            bool flag = TranClass.RunTran(sql);
                            if (flag)
                            {
                                dgv_DaoYouGuanLi.Rows.RemoveAt(dgv_DaoYouGuanLi.Rows[i].Index);
                            }
                            else
                            {
                                MessageBox.Show("删除出现异常，请重新删除！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
                            }
  
                }

            }

------解决方案--------------------
删除的话，到这来
for (int i = dataGridView1.Rows.Count-1; i >=0; i--)

------解决方案--------------------
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删除的话，到这来
for (int i = dataGridView1.Rows.Count-1; i >=0; i--)