dropDownList.DataSource = dataSet.Tables[0].DefaultView;
dropDownList.DataTextField = "Name";
dropDownList.DataValueField = "ID";
dropDownList.DataBind();
dropDownList.Items.Insert(0,new ListItem("选择选择",""));
dropDownList.DataSource = dataSet.Tables[0].DefaultView;
dropDownList.DataTextField = "Name";
dropDownList.DataValueField = "ID";
dropDownList.DataBind();
dropDownList.Items.Insert(0,new ListItem("选择选择",""));