ConfigurationManager.ConnectionStrings Property


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Gets the ConnectionStringsSection data for the current application's default configuration.

Namespace:   System.Configuration
Assembly:  System.Configuration (in System.Configuration.dll)

public static ConnectionStringSettingsCollection ConnectionStrings { get; }

Property Value

Type: System.Configuration.ConnectionStringSettingsCollection

Returns a ConnectionStringSettingsCollection object that contains the contents of the ConnectionStringsSection object for the current application's default configuration.

Exception Condition

Could not retrieve a ConnectionStringSettingsCollection object.

A ConnectionStringsSection object contains the contents of the configuration file's connectionStrings section.

The following example shows how to use a connection string to read data from a database.

using System;
using System.Configuration;
using System.Data.SqlClient;

namespace ConsoleApplication1
    class Program
        static void Main(string[] args)

        static void ReadProducts()
            var connectionString = ConfigurationManager.ConnectionStrings["WingtipToys"].ConnectionString;
            string queryString = "SELECT Id, ProductName FROM dbo.Products;";
            using (var connection = new SqlConnection(connectionString))
                var command = new SqlCommand(queryString, connection);
                using (var reader = command.ExecuteReader())
                    while (reader.Read())
                        Console.WriteLine(String.Format("{0}, {1}", reader[0], reader[1]));

The previous example assumes your project has an App.config as shown below.

<?xml version="1.0" encoding="utf-8" ?>
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
      <add name="WingtipToys" connectionString="Data Source=(LocalDB)\v11.0;Initial Catalog=WingtipToys;Integrated Security=True;Pooling=False" />

.NET Framework
Available since 2.0
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