This documentation is archived and is not being maintained.

DbConnectionStringBuilder.ContainsKey Method

Note: This method is new in the .NET Framework version 2.0.

Determines whether the DbConnectionStringBuilder contains a specific key.

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

public virtual bool ContainsKey (
	string keyword
public boolean ContainsKey (
	String keyword
public function ContainsKey (
	keyword : String
) : boolean



The key to locate in the DbConnectionStringBuilder.

Return Value

true if the DbConnectionStringBuilder contains an entry with the specified key; otherwise false.

Exception typeCondition


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

static void Main()
    DbConnectionStringBuilder builder = 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"))
        Console.WriteLine("The collection contains the key \"Data Source\".");
        Console.WriteLine("The collection does not contain the key \"Data Source\".");

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

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

.NET Framework

Supported in: 2.0