OleDbConnection Constructors

Definition

Initializes a new instance of the OleDbConnection class.

Overloads

OleDbConnection()

Initializes a new instance of the OleDbConnection class.

OleDbConnection(String)

Initializes a new instance of the OleDbConnection class with the specified connection string.

OleDbConnection()

Initializes a new instance of the OleDbConnection class.

public:
 OleDbConnection();
public OleDbConnection ();
Public Sub New ()

Examples

The following example creates and opens an OleDbConnection.

static void OpenConnection(string connectionString)
{
    using (OleDbConnection connection = new OleDbConnection(connectionString))
    {
        try
        {
            connection.Open();
            Console.WriteLine("DataSource: {0} \nDatabase: {1}",
                connection.DataSource, connection.Database);
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
        // The connection is automatically closed when the
        // code exits the using block.
    }
}
Public Sub OpenConnection(ByVal connectionString As String)

    Using connection As New OleDbConnection(connectionString)
        Try
            connection.Open()
            Console.WriteLine("DataSource: {0} Database: {1}", _
                connection.DataSource, connection.Database)
        Catch ex As Exception
            Console.WriteLine(ex.Message)
        End Try
        ' The connection is automatically closed when the
        ' code exits the Using block.
    End Using
End Sub

Remarks

When a new instance of OleDbConnection 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 empty string ("")
ConnectionTimeout 15
Database empty string ("")
DataSource empty string ("")

You can change the value for these properties only by using the ConnectionString property.

See also

OleDbConnection(String)

Initializes a new instance of the OleDbConnection class with the specified connection string.

public:
 OleDbConnection(System::String ^ connectionString);
public OleDbConnection (string connectionString);
new System.Data.OleDb.OleDbConnection : string -> System.Data.OleDb.OleDbConnection
Public Sub New (connectionString As String)

Parameters

connectionString
String

The connection used to open the database.

Examples

The following example creates and opens an OleDbConnection.

static void OpenConnection(string connectionString)
{
    using (OleDbConnection connection = new OleDbConnection(connectionString))
    {
        try
        {
            connection.Open();
            Console.WriteLine("DataSource: {0} \nDatabase: {1}",
                connection.DataSource, connection.Database);
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
        // The connection is automatically closed when the
        // code exits the using block.
    }
}
Public Sub OpenConnection(ByVal connectionString As String)

    Using connection As New OleDbConnection(connectionString)
        Try
            connection.Open()
            Console.WriteLine("DataSource: {0} Database: {1}", _
                connection.DataSource, connection.Database)
        Catch ex As Exception
            Console.WriteLine(ex.Message)
        End Try
        ' The connection is automatically closed when the
        ' code exits the Using block.
    End Using
End Sub

Remarks

When a new instance of OleDbConnection 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.

See also

Applies to