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SqlConnection Constructor (String)

Initializes a new instance of the SqlConnection class when given a string that contains the connection string.

Namespace: System.Data.SqlClient
Assembly: System.Data (in system.data.dll)

public SqlConnection (
	string connectionString
)
public SqlConnection (
	String connectionString
)
public function SqlConnection (
	connectionString : String
)

Parameters

connectionString

The connection used to open the SQL Server database.

When a new instance of SqlConnection is created, the read/write properties are set to the following initial values unless they are specifically set using their associated keywords in the ConnectionString property.

Properties

Initial value

ConnectionString

connectionString

ConnectionTimeout

15

Database

empty string ("")

DataSource

empty string ("")

You can change the value for these properties only by using the ConnectionString property. The SqlConnection class provides functionality for creating and managing the contents of connection strings.

The following example creates and opens a SqlConnection.

private static void OpenSqlConnection()
{
    string connectionString = GetConnectionString();

    using (SqlConnection connection = new SqlConnection(connectionString))
    {
        connection.Open();

        Console.WriteLine("State: {0", connection.State);
        Console.WriteLine("ConnectionString: {0",
            connection.ConnectionString);
    


static private string GetConnectionString()
{
    // To avoid storing the connection string in your code, 
    // you can retrieve it from a configuration file, using the 
    // System.Configuration.ConfigurationSettings.AppSettings property 
    return "Data Source=(local);Initial Catalog=AdventureWorks;"
        + "Integrated Security=SSPI;";


Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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