我在做壹個網頁,在網頁上添壹個控件DropDownList，選擇上海，應該顯示晴(要用到什麽控件?數據綁定)

SqlConnection conn = new SqlConnection(妳的sql連接串);

DataSet ds = new DataSet();

try

{

conn.Open();

SqlDataAdapter da = new SqlDataAdapter("select * from datafile", conn);

da.Fill(ds);

}

catch

{

}

finally

{

conn.Close();

}

DropDownList1.DataSource = ds;

DropDownList1.DataTextField = "城市";

DropDownList1.DataValueField = "天氣";

DropDownList1.DataBind();

在DropDownList1的DropDownList1_SelectedIndexChanged 事件裏寫

TextBox1.Text = DropDownList1.SelectedValue.ToString();

當然 妳也可以取DropDownList1的value 或text 然後再從數據庫取 壹對壹的話著樣相對簡單點