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DropDownList.Items.Add(new ListItem("È«²¿","Ëæ±ãÒ»¸öÖµ"));

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DropDownList.Items.Add(new ListItem("È«²¿","Ëæ±ãÒ»¸öÖµ")); 
 
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¾ÍÖ±½ÓDropDownList.datasource = list ????????

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SqlConnection sqlcon = new SqlConnection(Êý¾Ý¿âÁ¬½ÓÓï¾ä);
sqlcon.Open();
SqlCommand sqlcom = new SqlCommand("select*from±íÃû", sqlcon);
SqlDataReader dr = sqlcom.ExecuteReader();
List<string> s_list=null;
while (dr.Read())
{
   
if (s_list == null)
  s_list = new List<string>();
s_list.Add(dr.GetString(×Ö¶ÎÃû);
}
dr.Close();
sqlcon.Open();
for(int i=0;i<s_list.Count;i++){
DropDownList1.Items.Add(s_list[i]);}
DropDownList1.Items.Add("È«²¿");

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SqlConnection sqlcon = new SqlConnection(Êý¾Ý¿âÁ¬½ÓÓï¾ä);
sqlcon.Open();
SqlCommand sqlcom = new SqlCommand("select*from±íÃû", sqlcon);
SqlDataReader dr = sqlcom.ExecuteReader();
List <string> s_list=null;
while (dr.Read())
{