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()));

        }