如何获取数据集中列里面的值

我写这个代码只能获取当前列的名字

我想获得列里面的内容

应该怎么修改

public partial class _Default : System.Web.UI.Page
{
string chaxun = "select * from biaoge";
string str = string.Empty;
string con = "Password=.net; Pooling=true;min pool size=1;max pool size=10000;Persist Security Info=True;User ID=sa;Initial Catalog=zuoye;Data Source=201.1.1.90;";
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
SqlConnection Conn = new SqlConnection(con);
SqlDataAdapter myDA = new SqlDataAdapter(chaxun, Conn);
DataTable dt = new DataTable();
str += "<select>";
Conn.Open();
try
{
DataSet myds = new DataSet();
myDA.Fill(myds);
dt = myds.Tables[0];
for (int w = 0; w < dt.Columns.Count; w++)
str += "<option value='" + dt.Columns[w].ColumnName + "'>'" + dt.Columns[w].ColumnName + "'</option>";

}
finally
{
Conn.Close();
str += "<select>";
}

Response.Write("'" + str + "'");

//循环每一行

foreach (DataRow dr in dt)
{
Object x = dr[0]; //第一列的值

Object x = dr[1]; //第二列的值
}