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DbConnectionStringBuilder.AppendKeyValuePair Method (StringBuilder, String, String)

Provides an efficient and safe way to append a key and value to an existing StringBuilder object.

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

public static void AppendKeyValuePair (
	StringBuilder builder,
	string keyword,
	string value
public static void AppendKeyValuePair (
	StringBuilder builder, 
	String keyword, 
	String value
public static function AppendKeyValuePair (
	builder : StringBuilder, 
	keyword : String, 
	value : String
Not applicable.



The StringBuilder to which to add the key/value pair.


The key to be added.


The value for the supplied key.

This method allows developers using a StringBuilder to create a collection of key/value pairs to be able to take advantage of the features included in the DbConnectionStringBuilder class when you add key/value pairs, without having to incur the overhead of creating and maintaining a DbConnectionStringBuilder instance. The AppendKeyValuePair method formats the key and value correctly and adds the new string to the supplied StringBuilder.

If some process has created a connection string, but now an application must perform a simple modification to that connection string, it may be more efficient to just add the key/value pair using a StringBuilder object. Instead of creating a new DbConnectionStringBuilder, developers can call the AppendKeyValuePair method, passing in a StringBuilder that contains the supplied connection string. The following procedure shows a simple example of this technique.

public string AddPooling(string connectionString)
    StringBuilder builder = new StringBuilder(connectionString);
    DbConnectionStringBuilder.AppendKeyValuePair(builder, "Pooling", "true");
    return builder.ToString();

Windows 98, Windows Server 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 Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0