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DbConnectionStringBuilder.Remove Method

Removes the entry with the specified key from the DbConnectionStringBuilder instance.

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

'Declaration
Public Overridable Function Remove ( _
	keyword As String _
) As Boolean

Parameters

keyword
Type: System.String

The key of the key/value pair to be removed from the connection string in this DbConnectionStringBuilder.

Return Value

Type: System.Boolean
true if the key existed within the connection string and was removed; false if the key did not exist.

ExceptionCondition
ArgumentNullException

keyword is null (Nothing in Visual Basic)

NotSupportedException

The DbConnectionStringBuilder is read-only, or the DbConnectionStringBuilder has a fixed size.

Because the Remove method returns a value that indicates its success, it is not required to look for the key before trying to remove the key/value pair from the DbConnectionStringBuilder instance.

Sub Main()
    Dim builder As New DbConnectionStringBuilder
    builder.ConnectionString = _
        "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Demo.mdb;" & _
        "Jet OLEDB:System Database=system.mdw;" 

    ' Try to remove an existing item.
    TryRemove(builder, "Provider")

    ' Try to remove a nonexistent item.
    TryRemove(builder, "User ID")

    ' Try to remove an existing item,  
    ' demonstrating that the search isn't  
    ' case sensitive.
    TryRemove(builder, "DATA SOURCE")
    Console.ReadLine()
End Sub 

Sub TryRemove(ByVal builder As DbConnectionStringBuilder, _
    ByVal itemToRemove As String)

    If builder.Remove(itemToRemove) Then
        Console.WriteLine("Removed '{0}'", itemToRemove)
    Else
        Console.WriteLine("Unable to remove '{0}'", itemToRemove)
    End If
    Console.WriteLine(builder.ConnectionString)
End Sub

This sample displays the following output:

Removed 'Provider'
data source=C:\Demo.mdb;jet oledb:system database=system.mdw
Unable to remove 'User ID'
data source=C:\Demo.mdb;jet oledb:system database=system.mdw
Removed 'DATA SOURCE'
jet oledb:system database=system.mdw

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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