郁闷了，DDL就是不显示嘛，哪里有问题，我的数据库有数据的

public void DDLBind()
{
myConnection=new SqlConnection(ConnectionString);
string cmdtext="select * from NewsKinds";
DataSet ds=new DataSet();
SqlDataAdapter da=new SqlDataAdapter(cmdtext,myConnection);
da.Fill(ds);
ddl_newskinds.DataSource=ds;
ddl_newskinds.DataTextField="KindName";
ddl_newskinds.DataValueField="NewsKindID";
ddl_newskinds.DataBind();
myConnection.Close();
}