Vista - Changing the source name for the error in Windows log event

Using enterprise library, how can i get the custom source name in the windows
event log. When ever i am logging an error in windows event log, it gives the
source name as "Enterprise Library Logging". I want my custom source name
such as "MyApplication_Subsystem_Application" instead of "Enterprise Library
Logging ".
Source name would be different depending upon the application from where
the error occours.

Code in the Web.Config :

<loggingConfiguration name="Logging Application Block" tracingEnabled="true"
defaultCategory="General" logWarningsWhenNoCategoriesMatch="true">
<listeners>
<add source="MainApplication_Subsystem_Application" formatter="Text
Formatter"
log="Application" machineName=""
listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.FormattedEventLogTraceListenerData,
Microsoft.Practices.EnterpriseLibrary.Logging, Version=3.1.0.0,
Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
traceOutputOptions="None"
type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.FormattedEventLogTraceListener,
Microsoft.Practices.EnterpriseLibrary.Logging, Version=3.1.0.0,
Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
name="EventLoggingListener" />
<add source="Enterprise Library Logging" formatter="" log="Application"
machineName=""
listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.FormattedEventLogTraceListenerData,
Microsoft.Practices.EnterpriseLibrary.Logging, Version=3.1.0.0,
Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
traceOutputOptions="None"
type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.FormattedEventLogTraceListener,
Microsoft.Practices.EnterpriseLibrary.Logging, Version=3.1.0.0,
Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
name="Formatted EventLog TraceListener1" />
</listeners>
<formatters>
<add template="Timestamp: {timestamp}
Message: {message}
Category: {category}
Priority: {priority}
EventId: {eventid}
Severity: {severity}
Title:{title}
Machine: {machine}
Application Domain: {appDomain}
Process Id: {processId}
Process Name: {processName}
Win32 Thread Id: {win32ThreadId}
Thread Name: {threadName}
Extended Properties: {dictionary({key} - {value}
)}"

type="Microsoft.Practices.EnterpriseLibrary.Logging.Formatters.TextFormatter,
Microsoft.Practices.EnterpriseLibrary.Logging, Version=3.1.0.0,
Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
name="Text Formatter" />
</formatters>
<categorySources>
<add switchValue="All" name="EventLogger">
<listeners>
<add name="EventLoggingListener" />
</listeners>
</add>
<add switchValue="All" name="General">
<listeners>
<add name="EventLoggingListener" />
</listeners>
</add>
</categorySources>
<specialSources>
<allEvents switchValue="All" name="All Events" />
<notProcessed switchValue="All" name="Unprocessed Category" />
<errors switchValue="All" name="Logging Errors & Warnings">
<listeners>
<add name="EventLoggingListener" />
</listeners>
</errors>
</specialSources>
</loggingConfiguration>