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How to get Connection String from App.Config in C#

, 15 Oct 2013
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This code helps you to grab ConnectionString from App.config.

Introduction

We always use Connection String in forms that we design but when you design a big software you should set the connection string for once and use it in many forms. In this method you use the name of the Connection String instead of the connection string text. 

Every time you want to change the connection string just change the main connection string in the App.Config file.

By this method you don't need to change all of the forms in your project, just change the Connection String in the App.Config.

Using the Code

First of all you should set the connection string in the App.Config file. For example I set the connection string for my database as you see here:

<?xml version="1.0"?>
<configuration>
  <connectionStrings>
    <add name="CharityManagement" 
    connectionString="Data Source=.;Initial Catalog=CharityManagement;Integrated Security=True"/>
  </connectionStrings>
</configuration> 

After that you use the connection string in your forms using this code:

In your forms you set references that you want to use:

using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Windows.Forms;

Then you can get the Connection String from the App.Config by using the ConnectionStrings property.

var connectionString=ConfigurationManager.ConnectionStrings["CharityManagement"].ConnectionString;

You can use this method in both Windows Forms and ASP.NET projects.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Alireza Chegini
Web Developer
Iran (Islamic Republic Of) Iran (Islamic Republic Of)
I like programming because when you design a software you create a thing that improve your life.
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Comments and Discussions

 
GeneralMy vote of 5 [modified] Pinmembersrilekhamenon15-Mar-14 0:17 
SuggestionUse repository pattern instead PinmemberUldis Rāts17-Oct-13 0:04 
GeneralMy vote of 5 PinmemberJasonMacD15-Oct-13 11:03 
GeneralRe: My vote of 5 PinmvpSacha Barber15-Oct-13 21:54 
GeneralRe: My vote of 5 PinmemberJasonMacD16-Oct-13 2:32 
GeneralMy vote of 5 Pinmemberho.kurd27-Aug-13 12:52 
GeneralMy vote of 1 Pinmembercsd21-May-13 22:13 
GeneralRe: My vote of 1 PinmemberJasonMacD15-Oct-13 11:02 
GeneralMy vote of 5 PinmemberMember 850885518-Feb-13 1:19 
NewsThe problem of the location of the app.config file. PinmemberAmitMukherjee13-Feb-13 23:46 
SuggestionAdd Reference Pinmemberleonelbeira6-Jan-13 4:45 
QuestionIf you face Problem PinmemberSarveh kumar19-Sep-12 1:22 
AnswerRe: If you face Problem PinmemberVenkat Raghvan10-Oct-13 21:33 
AnswerRe: If you face Problem PinmemberAlireza Chegini15-Oct-13 10:35 

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