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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


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".

.NET Framework

Supported in: 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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