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c# write database to text file

Posted on 2010-11-29
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Medium Priority
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Last Modified: 2012-05-10

the code below output is
thisrowthisrowthisrowthisrowthisrowthisrow

How can I change it to value from database i think must correct this statement
( System.IO.File.AppendAllText(@"C:\file.txt", "thisrow");)
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 MySql.Data.MySqlClient;
using System.Web;


namespace WindowsFormsApplication1
{


   
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            string MyConString = "SERVER=localhost;" +
                "DATABASE=registration;" +
                "UID=root;" +
                "PASSWORD='';";
            MySqlConnection connection = new MySqlConnection(MyConString);
            MySqlCommand command = connection.CreateCommand();
            MySqlDataReader Reader;
            command.CommandText = "select * from teera";
            connection.Open();
            Reader = command.ExecuteReader();
            while (Reader.Read())
            {
                string thisrow = "";
                for (int i = 0; i < Reader.FieldCount; i++)
                    thisrow += Reader.GetValue(i).ToString() + ",";
                listBox1.Items.Add(thisrow);
                System.IO.File.AppendAllText(@"C:\file.txt", "thisrow");
            }
            connection.Close();

        }
    }
}

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Question by:teera
  • 2
3 Comments
 
LVL 30

Expert Comment

by:anarki_jimbel
ID: 34235809
change to:

System.IO.File.AppendAllText(@"C:\file.txt", thisrow + Environment.NewLine) // remove quotations
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Accepted Solution

by:
anarki_jimbel earned 2000 total points
ID: 34235905
Just to add :)

According to my comment in another question, i'd change the code as below.
Benefits:
 - just one use of IO, this is much faster
 - also, you may close connection earlier, not waiting for time-consuming IO operations

The first one might be very important if you have hundreds of lines. Also, your UI will respond faster, I believe.
string MyConString = "SERVER=localhost;" +
                "DATABASE=registration;" +
                "UID=root;" +
                "PASSWORD='';";
            MySqlConnection connection = new MySqlConnection(MyConString);
            MySqlCommand command = connection.CreateCommand();
            MySqlDataReader Reader;
            command.CommandText = "select * from teera";
            connection.Open();
            Reader = command.ExecuteReader();
            StringBuilder sb = new StringBuilder();
            while (Reader.Read())
            {
                string thisrow = "";
                for (int i = 0; i < Reader.FieldCount; i++)
                    thisrow += Reader.GetValue(i).ToString() + ",";
                listBox1.Items.Add(thisrow);
                //System.IO.File.AppendAllText(@"C:\file.txt", "thisrow");
                sb.Append(s + Environment.NewLine);
            }
            connection.Close();
            System.IO.File.WriteAllText(@"C:\path\to\file.txt", sb.ToString());

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Author Closing Comment

by:teera
ID: 34235948
Thank you
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