需要在单列中存储多个用逗号分隔的值

Question

I'm developing a website Which contains profile of n no of peoples. Here what the user will do is, he/she want to log in to view the peoples details.Only register user have the rights to view the details and he can view n no peoples details on one time login. when ever the user click on the each profile its id should store in database.

In a database i have field called profileid. 1st time when user click on the profile means its id is getting stored in profileid.

What i want is when the same user click another profile id ,then it should store in same field with previous one with comma(,).

Eg:

profieid 20 20,15 20,15,10.

Likewise it should store..

Here is my update query

string Name = (string)(Session["Name"]);
        string time = (string)(Session["Time"]);
        string sql = ("UPDATE  History set RegID_UserProfile='" + Request.QueryString["id"].ToString() + "' WHERE UserName='" + Name + "' and LoginTime='" + time + "'");
        SqlCommand cmd7 = new SqlCommand(sql, con);
        int temp = cmd7.ExecuteNonQuery();
        if (temp == 1)
        {
            //aa
        }
        con.Close();

Anyone have the idea to achieve this???

Answer 1

Changing the following line in your code would help you achieve what you want:

string sql = ("UPDATE  History set RegID_UserProfile=RegID_UserProfile + ',' + '" + Request.QueryString["id"].ToString() + "' WHERE UserName='" + Name + "' and LoginTime='" + time + "'");

But now a piece of advice, what you are doing and the way you are doing is immencely outdated, haveing too many flaws and secutiry vulnerabilities. You should look for new methods of db access.

Hope this helps.