Export Table Data from Multiple Databases in CSV

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.IO;
namespace testcsv2table
{
   public partial class Form1 : Form
   {
      public Form1()
      {
         InitializeComponent();
      }
      public void Aimsweb(string t)
      {
         string sep = ",";
         string tablename = string.Empty;
         string fileloc = string.Empty;
         string filename = string.Empty;
         string connection = string.Empty;
         if(t=="abc")
         {
            tablename = Properties.Settings.Default.Aimsweb_view;
            fileloc = Properties.Settings.Default.filelocation;
            filename =tablename+ Properties.Settings.Default.Aimsweb_Csvfilename;
            // string dateflag = string.Empty;
            connection = Properties.Settings.Default.connectionstring;
         }
         if (t == "iShrissDB")
         {
            tablename = Properties.Settings.Default.Aimsweb_view1;
            fileloc = Properties.Settings.Default.filelocation;
            filename = tablename + Properties.Settings.Default.Aimsweb_Csvfilename;
            connection = Properties.Settings.Default.connectionstring2;
         }
         fileloc = fileloc + @"\";
         string fl = fileloc + filename + ".csv";//make changes in settings.settings file to change in fileloc, filename (fileloc, filename) column
         SqlConnection con = new SqlConnection(connection); //make changes in settings.settings file to change the connection in(connectionstring) column
         SqlCommand cmd = new SqlCommand("Select * from " + tablename, con); //make changes in settings.settings file to change for tablename in(tablename) column
         con.Open();
         try
         {
            SqlDataReader dr = cmd.ExecuteReader();
            int fields = dr.FieldCount - 1;
            string data = string.Empty;
            string g = string.Empty;
            while (dr.Read())
            {
               StringBuilder sb = new StringBuilder();
               for (int i = 0; i <= fields; i++)
               {
                  if (i == fields)
                  {
                     sep = " ";
                  }
                  sb.Append(dr[i].ToString() + sep);
                  data = sb.ToString();
               }
               g += data;
               g = g.Replace(" ",System.Environment.NewLine);
               System.IO.File.WriteAllText(@fl, g);
               sep = ",";
            }
            con.Close();
            // MessageBox.Show("done");
         }
         catch (Exception ec)
         {
            MessageBox.Show(ec.Message);
         }
      }
      private void Form1_Load(object sender, EventArgs e)
      {
      }
      private void button1_Click(object sender, EventArgs e)
      {
         Aimsweb("abc");
         Aimsweb("iShrissDB");
      }
   }
}