Question

dropdownlist 绑定后，在页面中没有显示，是怎么回事？

代码如下：
public DataSet GetDataSet1(string sqlStr, string TableName)
{
SqlConnection myConn = conn();//创建连接对象
myConn.Open();//打开数据库连接
DataSet ds = new DataSet();
SqlDataAdapter adapt = new SqlDataAdapter(sqlStr, myConn);
adapt.Fill(ds, TableName);
myConn.Close();
return ds;
}

protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack)
{
bindTopic();
}
}
public void bindTopic()
{
string sqlstr = "select * from vote";
Topic_List.DataSource = que.GetDataSet1(sqlstr, "vote");
Topic_List.DataTextField = "Name";
Topic_List.DataValueField = "Tid";
Topic_List.DataBind();
}

Answer 1

if(!IsPostBack)