DropDownList总结

aspx文件

<asp:DropDownList ID="ddlDType" runat="server" DataValueField="infoID" DataTextField="bmname">
 </asp:DropDownList>

　　

cs文件

 public void getDataLeiC()
        {

            string sql = "select * from xqybumeng_info where infotype='2'";
            SqlConnection conn = BaseClass.DBCon();
            SqlDataAdapter sda = new SqlDataAdapter(sql, conn);
            DataSet ds = new DataSet();
            sda.Fill(ds);
            this.ddlDType.DataSource = ds.Tables[0].DefaultView;
            this.ddlDType.DataBind();
            this.ddlDType.Items.Insert(0, new ListItem("请选择", "0"));


        }

//判断是否选择

if (ddlDType.SelectedItem.Value != "0")
{}