Quick method for fetching database information

ReturnDatabaseInfo.cs

public static List<string> InfoReturner(List<string> infoToReturn)
    {//Load in data based on the string in the List<string>
        List<string> ReturnedInfo = new List<string>();

        /*
        How this works: Create a list that holds the info you want to have.
        The list with info obtained will be returned so you can use it like below:

        System.Collections.Generic.List<string> GetUserInfo = new System.Collections.Generic.List<string>();
        GetUserInfo.Add("Email");
        GetUserInfo.Add("Country");
        currentClass.UserInfoReturner(GetUserInfo);

        Now get the returned info like this:
        string Email = ReturnedInfo[0];
        string Country = ReturnedInfo[1];
        
        Or simplified (doesn't require creating a new list for the returned info):
        string Email = currentClass.InfoReturner(GetUserInfo)[0];
        string Country = currentClass.InfoReturner(GetUserInfo)[1];
        */

        string AppendedInfo = null; //String that will hold the combined items to return
        int l = 0;
        {//Append data to the string, to use for inserting in the command
            foreach(string Key in infoToReturn)
            {
                if (l == 0)
                {//On the first run, don't add the ","
                    AppendedInfo = infoToReturn[l];
                }
                else
                {
                    AppendedInfo = AppendedInfo + ", " + Key;
                }
                l++;
            }
        }

        using (con) //Set your (My)SQLconnection string here for using
        {
            //First, get the row count to itterate over
            MySqlCommand cmd = new MySqlCommand("SELECT " + AppendedInfo + " FROM yourtable", con);
            if (con.State != ConnectionState.Open) con.Open();

            using (MySqlDataReader  rdr = cmd.ExecuteReader())
            {
                while (rdr.Read())
                {
                    //Itterate over the results
                    for(int i = 0; i != infoToReturn.Count ; i++)
                    {
                        ReturnedInfo.Add(rdr[i].ToString());
                    }
                }

                rdr.Close();
            }
            
            if (con.State != ConnectionState.Closed) con.Close();
        }

        return ReturnedInfo;  //Now return the list 
    }