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 = "==请选择==";
ddlWareHouseName.Items.Insert(0, li);
string s=DropDownList1.SelectedItem.Text;//这是获取选中的文本值((实际显示的内容))
string s=DropDownList1.SelectedValue//获取DropDownList中你设定的Value值(隐藏对应的值)
int i = DropDownList1.SelectedItem.ItemIndex; //获取当前先中的Index
combox1.text 这是获取选中的文本值((实际显示的内容))
combox1.SelectedIndex=-1 取消当前选中项