DropdownList绑定的两种方法

 

动态绑定方法一：动态绑定数据库中的字段。 SqlConnection conn = UtilitySqlClass.OperateDataBase.ReturnConn(); string strSQL = "select * from CompanyType"; SqlDataAdapter ada = new SqlDataAdapter(strSQL, conn); DataSet ds = new DataSet(); ada.Fill(ds, "CompanyType"); DropDownList1.DataSource = ds.Tables["CompanyType"].DefaultView; DropDownList1.DataValueField = ds.Tables["CompanyType"].Columns[1].ColumnName; DropDownList1.DataTextField = ds.Tables["CompanyType"].Columns[1].ColumnName; DropDownList1.DataBind(); ds.Dispose();     动态绑定方法二：利用DropDownList.Items.Add方法。 protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { SqlConnection conn = UtilitySqlClass.OperateDataBase.ReturnConn(); try { conn.Open(); this.DropDownList1.Items.Add(""); string strSQL = "select CompanyType from CompanyType"; SqlCommand com = new SqlCommand(strSQL, conn); SqlDataReader dr = com.ExecuteReader(); while (dr.Read()) { this.DropDownList1.Items.Add(dr["CompanyType"].ToString()); } } catch (Exception ex) { Response.Write("<scirpt>alert('" + ex.Message.ToString() + "')</script>"); } finally { conn.Close(); } } } 第一种方法：         string ConnString = ConfigurationSettings.AppSettings["ConnectionString"];          //创建一个SqlConnection          SqlConnection Conn = new SqlConnection( ConnString );                  string SQL_Select = "select id, ItemName from DDLItem order by id desc";          //构造一个SqlDataAdapter          SqlDataAdapter myAdapter = new SqlDataAdapter( SQL_Select, Conn);          //開始读取数据          Conn.Open();          DataSet dataSet = new DataSet();          myAdapter.Fill( dataSet,"Table1" );          Conn.Close();          //開始绑定DropDownList          //指定DropDownList使用的数据源          DropDownList1.DataSource = dataSet.Tables["Table1"].DefaultView;          //指定DropDownList使用的表里的那些字段          DropDownList1.DataTextField = "ItemName"; //dropdownlist的Text的字段          DropDownList1.DataValueField = "id";//dropdownlist的Value的字段          DropDownList1.DataBind(); 另外一种方法：         con.Open();         SqlCommand cmd = new SqlCommand(strSql,con);         SqlDataReader dr = cmd.ExecuteReader();         while (dr.Read())         {                  DropDownList1.Items.Add(new ListItem(dr["status"].ToString(), dr["status_Id"].ToString()));         }