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DbConnectionStringBuilder.ContainsKey Method

Determines whether the DbConnectionStringBuilder contains a specific key.

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

Public Overridable Function ContainsKey ( _
	keyword As String _
) As Boolean
Dim instance As DbConnectionStringBuilder 
Dim keyword As String 
Dim returnValue As Boolean 

returnValue = instance.ContainsKey(keyword)


Type: System.String

The key to locate in the DbConnectionStringBuilder.

Return Value

Type: System.Boolean
true if the DbConnectionStringBuilder contains an entry with the specified key; otherwise false.


keyword is a null reference (Nothing in Visual Basic).

Sub Main()
    ' The following code example searches for an element in a  
    ' DbConnectionStringBuilder. 
    Dim builder As New DbConnectionStringBuilder
    builder.Add("Provider", "Provider=Microsoft.Jet.OLEDB.4.0")
    builder.Add("Data Source", "C:\ThisExcelWorkbook.xls")
    builder.Add("Extended Properties", "Excel 8.0;HDR=Yes;IMEX=1")

    ' Displays the values in the DbConnectionStringBuilder.
    Console.WriteLine("Contents of the DbConnectionStringBuilder:")

    ' Searches for a key. 
    If builder.ContainsKey("Data Source") Then
        Console.WriteLine("The collection contains the key ""Data Source"".")
        Console.WriteLine("The collection does not contain the key ""Data Source"".")
    End If
End Sub

This code produces the following output:

Contents of the DbConnectionStringBuilder:
properties="Excel 8.0;HDR=Yes;IMEX=1"
The collection contains the key "Data Source".

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