private void IniteDGV(){DataGridViewComboBoxColumn combo = new DataGridViewComboBoxColumn();combo.HeaderText = "comboBox列";combo.Name = "combo";combo.Width = 80;combo.DataSource=(new string[] { "0", "1", "2" });DataGridViewTextBoxColumn textbox = new DataGridViewTextBoxColumn();textbox.HeaderText = "textbox列";textbox.Name = "textbox";textbox.Width = 100;dataGridView.Columns.AddRange(combo, textbox);DataGridViewRow row = new DataGridViewRow();dataGridView.Rows.Add(row);if (dataGridView.Columns.Contains("combo") ){row.Cells["combo"].Value = "0";}}

CellClick事件
private void dataGridView_CellClick(object sender, DataGridViewCellEventArgs e){if (e.RowIndex >= 0 && e.ColumnIndex >= 0){DataGridViewComboBoxColumn combo = dataGridView.Columns[e.ColumnIndex] as DataGridViewComboBoxColumn;if (combo != null)  //如果该列是ComboBox列
                {dataGridView.BeginEdit(false); //结束该列的编辑状态DataGridViewComboBoxEditingControl comboEdite = dataGridView.EditingControl as DataGridViewComboBoxEditingControl;if (comboEdite != null){comboEdite.DroppedDown = true; //展现下拉列表
                    }}DataGridViewTextBoxColumn textbox = dataGridView.Columns[e.ColumnIndex] as DataGridViewTextBoxColumn;if (textbox != null) //如果该列是TextBox列
                {dataGridView.BeginEdit(true); //开始编辑状态
                }}}

CellEnter事件
private void dataGridView_CellEnter(object sender, DataGridViewCellEventArgs e){DataGridView dgv = sender as DataGridView;if (dgv != null){if (dgv.Columns[e.ColumnIndex].Name == "combo" &&dgv.Columns[e.ColumnIndex] is DataGridViewComboBoxColumn){SendKeys.Send("{F4}"); //选中ComboBox列时，相当于按了键盘的F4键
                }}}