combox 的使用
cb_WareHouseName.DataSource = dt;
cb_WareHouseName.DisplayMember = "StockName";
cb_WareHouseName.ValueMember = "ID";
dropdownlist 的使用
ddlWareHouseName.DataSource = pdas.GetStockInfo();
ddlWareHouseName.DataTextField = "StockName";
ddlWareHouseName.DataValueField = "ID";
ddlWareHouseName.DataBind();
ListItem li = newListItem();
li.Text = "==請選擇==";
ddlWareHouseName.Items.Insert(0, li);
string s=DropDownList1.SelectedItem.Text;//這是獲取選中的文本值((實際顯示的內容))
string s=DropDownList1.SelectedValue//獲取DropDownList中你設定的Value值(隱藏對應的值)
int i = DropDownList1.SelectedItem.ItemIndex; //獲取當前先中的Index
combox1.text 這是獲取選中的文本值((實際顯示的內容))
combox1.SelectedIndex=-1 取消當前選中項