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SqlConnectionStringBuilder.AttachDBFilename Property

Gets or sets a string that contains the name of the primary data file. This includes the full path name of an attachable database.

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

'Declaration
Public Property AttachDBFilename As String
'Usage
Dim instance As SqlConnectionStringBuilder 
Dim value As String 

value = instance.AttachDBFilename

instance.AttachDBFilename = value

Property Value

Type: System.String
The value of the AttachDBFilename property, or String.Empty if no value has been supplied.

This property corresponds to the "AttachDBFilename", "extended properties", and "initial file name" keys within the connection string. If the value passed in is null when you try to set the property, the AttachDBFilename property is reset. If the value has not been set and the developer tries to retrieve the property, the return value is String.Empty.

NoteNote:

If the primary data file (.mdf) is read-only, the attachment will fail because the log path inside of the .mdf file needs to be updated. This could occur if the file has been copied from a CD. Change the file attribute to read/write prior to attaching it. AttachDBFilename is only supported for primary data files with an .mdf extension.

An error will be generated if a log file exists in the same directory as the data file and the 'database' keyword is used when attaching the primary data file. In this case, remove the log file. Once the database is attached, a new log file will be automatically generated based on the physical path.

The following example creates a new SqlConnectionStringBuilder instance, and sets the AttachDBFilename property in order to specify the name of an attached data file.

Imports System.Data.SqlClient

Module Module1
    Sub Main()
        Try 
            Dim connectString As String = _
             "Server=(local);" & _
             "Integrated Security=True" 
            Dim builder As New SqlConnectionStringBuilder(connectString)
            Console.WriteLine("Original: " & builder.ConnectionString)
            Console.WriteLine("AttachDBFileName={0}", _
             builder.AttachDBFilename)
            builder.AttachDBFilename = "C:\MyDatabase.mdf"
            Console.WriteLine("Modified: " & builder.ConnectionString)

            Using connection As New SqlConnection(builder.ConnectionString)
                connection.Open()
                ' Now use the open connection.
                Console.WriteLine("Database = " & connection.Database)
            End Using

            Console.WriteLine("Press any key to finish.")
            Console.ReadLine()

        Catch ex As Exception
            Console.WriteLine(ex.Message)
        End Try 
    End Sub 
End Module

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0

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