在Datagridview中添加datagridviewComboBox列并显示下拉列表

private void button_autoAddColumn_Click(object sender, EventArgs e)
{
try
{
/*链接数据库并获取数据*/
string connString = "Server=.;Database=testDatabase;Integrated Security=SSPI";
SqlConnection conn = new SqlConnection(connString);
string queryString = "select forename,surname,ISNULL(reportsto,0) as reprotsTo from imployee";
SqlDataAdapter da = new SqlDataAdapter(queryString, conn);
DataSet ds = new DataSet();
da.Fill(ds, "imployee");
queryString = "select forename+' '+surname as name ,reportsto from imployee union select '0','(None)'";
da = new SqlDataAdapter(queryString, conn);
da.Fill(ds, "manager");

/**参照C#高级编程书的Datagridview使用combobox列的代码编写**/

SetupColumn(ds);//调用添加Datagridview列的函数
this.dataGridView2.RowTemplate.Height = 20;

this.dataGridView2.AutoGenerateColumns = false;//要想动态添加Column，就必须设置为true
this.dataGridView2.DataSource = ds.Tables["imployee"];
}
catch (SqlException exp)
{
MessageBox.Show("数据库链接读取数据过程中出现错误：" + exp.Message);
}

}

private void SetupColumn(DataSet ds)
{
DataGridViewTextBoxColumn deptcode = new DataGridViewTextBoxColumn();
deptcode.DataPropertyName = "deptcode";
deptcode.HeaderText = "deptcode";
deptcode.ValueType = typeof(string);
deptcode.Frozen = true;
this.dataGridView2.Columns.Add(deptcode);

DataGridViewTextBoxColumn deptname = new DataGridViewTextBoxColumn();
deptname.DataPropertyName = "deptname";
deptname.HeaderText = "deptname";
deptname.ValueType = typeof(string);
deptname.Frozen = true;
this.dataGridView2.Columns.Add(deptname);

DataGridViewImageColumn dgvimageColumn = new DataGridViewImageColumn();
dgvimageColumn.DataPropertyName = "dgvimageColumn";
dgvimageColumn.HeaderText = "dgvimageColumn";
dgvimageColumn.ValueType = typeof(Image);
dgvimageColumn.Frozen = true;
this.dataGridView2.Columns.Add(dgvimageColumn);

DataGridViewComboBoxColumn dgvComboboxColumn = new DataGridViewComboBoxColumn();
dgvComboboxColumn.DataPropertyName = "dgvComboboxColumn";
dgvComboboxColumn.DataSource = this.getTable().DefaultView;
dgvComboboxColumn.DisplayMember = "forename";
dgvComboboxColumn.ValueMember = "forename";
dgvComboboxColumn.HeaderText = "dgvComboboxColumn";
dgvComboboxColumn.ValueType = typeof(Image);

dgvComboboxColumn.Frozen = true;

this.dataGridView2.Columns.Add(dgvComboboxColumn);

DataGridViewLinkColumn dgvLinkColumn = new DataGridViewLinkColumn();
dgvLinkColumn.DataPropertyName = "dgvLinkColumn";
dgvLinkColumn.HeaderText = "dgvLinkColumn";
dgvLinkColumn.ValueType = typeof(Image);
dgvLinkColumn.Frozen = true;
this.dataGridView2.Columns.Add(dgvLinkColumn);

DataGridViewCheckBoxColumn dgvCheckBoxColumn = new DataGridViewCheckBoxColumn();
dgvCheckBoxColumn.DataPropertyName = "CheckBox";
dgvCheckBoxColumn.HeaderText = "CheckBox Column";
dgvCheckBoxColumn.ValueType = typeof(bool);
dgvCheckBoxColumn.Frozen = true;
this.dataGridView2.Columns.Add(dgvCheckBoxColumn);

}
private DataTable getTable()
{
string connString = "Server=.;Database=testDatabase;Integrated Security=SSPI";
//string connString = "Server=.;Database=hr;Integrated Security=SSPI";
SqlConnection conn = new SqlConnection(connString);
conn.Open();
string queryString = "select distinct forename from imployee";
DataTable dt = new DataTable();
SqlDataAdapter sqlda = new SqlDataAdapter(queryString, conn);
sqlda.Fill(dt);
return dt;

}