SqlConnection con = new SqlConnection("你的数据库连接串");
SqlCommand cmd = new SqlCommand("select User_id,count(User_id) as ucount from cs group by User_id", con);
var dr = cmd.ExecuteReader();
while (dr.Read())
{
Response.Write(dr["User_id"].ToString() + "," + dr["ucount"].ToString());//如果查询还要其他东西类似这么写就行
}
con.close();
dr.close();