SqlConnectionStringBuilder.AttachDBFilename SqlConnectionStringBuilder.AttachDBFilename SqlConnectionStringBuilder.AttachDBFilename 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.

 property System::String ^ AttachDBFilename { System::String ^ get(); void set(System::String ^ value); };
public string AttachDBFilename { get; set; }
member this.AttachDBFilename : string with get, set
Public Property AttachDBFilename As String

Property Value

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



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

using System.Data.SqlClient;

class Program
    static void Main()
            string connectString =
                "Server=(local);" +
                "Integrated Security=true";
            SqlConnectionStringBuilder builder =
                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 (SqlConnection connection = new SqlConnection(builder.ConnectionString))
                // Now use the open connection.
                Console.WriteLine("Database = " + connection.Database);
            Console.WriteLine("Press any key to finish.");
        catch (Exception ex)
Imports System.Data.SqlClient

Module Module1
    Sub Main()
            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 = "C:\MyDatabase.mdf"
            Console.WriteLine("Modified: " & builder.ConnectionString)

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

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

        Catch ex As Exception
        End Try
    End Sub
End Module


This property corresponds to the "AttachDBFilename", "extended properties", and "initial file name" keys within the connection string.

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.

Applies to

See also