Get connection string from app.config

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(Form1.cs)

C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication3
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {

        }
    }
}

app.config file details

HTML

<configuration>
    <configsections>
    </configsections>
    <connectionstrings>
        <add name="WindowsApplication3.Properties.Settings.Database1ConnectionString">
            connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Database1.mdf;Integrated Security=True;User Instance=True"
            providerName="System.Data.SqlClient" />
    </add></connectionstrings>
</configuration>

this is my commection string how to access this connection in windows form..

Posted 1-Oct-12 18:16pm

abey e mathews

Updated 1-Oct-12 18:18pm

JF2015

v2

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3 solutions

Solution 3

SqlConnection con = new SqlConnection("Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|\\cargo.mdf;Integrated Security=True;User Instance=True");

Posted 1-Oct-12 19:11pm

abey e mathews

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**JF2015** · Accepted Answer · 2012-10-01T18:29:00

Hi,

use this code:

C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication3
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
           var connectionString = ConfigurationManager.ConnectionStrings["WindowsApplication3.Properties.Settings.Database1ConnectionString"].ConnectionString;
           MessageBox.Show(connectionString);
        }
    }
}

And change your app.config file to the following:

HTML

<configuration>
  <connectionstrings>
    <add name="WindowsApplication3.Properties.Settings.Database1ConnectionString">
    connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Database1.mdf;Integrated Security=True;User Instance=True" 
    providerName="System.Data.SqlClient"/>
  </add></connectionstrings>
</configuration>

I tested it and it works for me.

ythisbug · Accepted Answer · 2012-10-01T18:41:00

hi try this

C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Data.SqlClient;//add this two namespace
using System.Web.Configuration;

using System.Windows.Forms;

namespace WindowsApplication3
{
    public partial class Form2 : Form
    {
 

        public Form2()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
         SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings["WindowsApplication3.Properties.Settings.Database1ConnectionString"].ToString());

        }
    }
}

Get connection string from app.config

3 solutions

Solution 1

Solution 2

Solution 3

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