给DataGridView更新数据源，采用手动方式，即首先设置手工添加不同的DataGridViewColumn。将各列DataPropertyName属性设置成数据源，就是数据库的列名或者对象名。

dataGridView1.AutoGenerateColumns = false;

DataGridViewComboBoxCell 设置的复杂一些，要设置下拉选项。参考

DataGridViewComboBoxColumn assignedToColumn = new DataGridViewComboBoxColumn(); // Populate the combo box drop-down list with Employee objects.  foreach (Employee e in employees) assignedToColumn.Items.Add(e); // Add "unassigned" to the drop-down list and display it for // empty AssignedTo values or when the user presses CTRL+0.  assignedToColumn.Items.Add("unassigned");         assignedToColumn.DefaultCellStyle.NullValue = "unassigned";         assignedToColumn.Name = "Assigned To";         assignedToColumn.DataPropertyName = "AssignedTo";         assignedToColumn.AutoComplete = true;         assignedToColumn.DisplayMember = "Name";         assignedToColumn.ValueMember = "Self";