SqlConnection Constructors

Source:

System.Data.SqlClient.notsupported.cs

public:
 SqlConnection();

public SqlConnection ();

Public Sub New ()

Examples

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

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.ConfigurationManager.ConnectionStrings property
    return "Data Source=(local);Initial Catalog=AdventureWorks;"
        + "Integrated Security=SSPI;";
}

Private Sub OpenSqlConnection()
    Dim connectionString As String = GetConnectionString()
    Using connection As New SqlConnection(connectionString)
        connection.Open()
        Console.WriteLine("ServerVersion: {0}", connection.ServerVersion)
        Console.WriteLine("State: {0}", connection.State)
    End Using
End Sub

Private Function GetConnectionString() As String
    ' To avoid storing the connection string in your code,  
    ' you can retrieve it from a configuration file, using the
    ' System.Configuration.ConfigurationManager.ConnectionStrings property
    Return "Data Source=(local);Database=AdventureWorks;" _
      & "Integrated Security=SSPI;"
End Function

Remarks

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.

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

See also

• Connecting to a Data Source in ADO.NET
• SQL Server and ADO.NET
• ADO.NET Overview

Source:

System.Data.SqlClient.notsupported.cs

public:
 SqlConnection(System::String ^ connectionString);

public SqlConnection (string connectionString);

new System.Data.SqlClient.SqlConnection : string -> System.Data.SqlClient.SqlConnection

Public Sub New (connectionString As String)

Parameters

Exceptions

Examples

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;";
}

Private Sub OpenSqlConnection()
    Dim connectionString As String = GetConnectionString()

    Using connection As New SqlConnection(connectionString)

        connection.Open()

        Console.WriteLine("State: {0}", connection.State)
        Console.WriteLine("ConnectionString: {0}", _
            connection.ConnectionString)
    End Using
End Sub

Private Function GetConnectionString() As String
    ' 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);Database=AdventureWorks;" _
      & "Integrated Security=SSPI;"
End Function

Remarks

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.

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.

See also

• Connecting to a Data Source (ADO.NET)
• Using the .NET Framework Data Provider for SQL Server
• ADO.NET Overview

Source:

System.Data.SqlClient.notsupported.cs

public:
 SqlConnection(System::String ^ connectionString, System::Data::SqlClient::SqlCredential ^ credential);

public SqlConnection (string connectionString, System.Data.SqlClient.SqlCredential credential);

new System.Data.SqlClient.SqlConnection : string * System.Data.SqlClient.SqlCredential -> System.Data.SqlClient.SqlConnection

Public Sub New (connectionString As String, credential As SqlCredential)

Parameters

Exceptions

See also

• ADO.NET Overview