SqlDependency::Start Method (String^, String^)


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Starts the listener for receiving dependency change notifications from the instance of SQL Server specified by the connection string using the specified SQL Server Service Broker queue.

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

[HostProtectionAttribute(SecurityAction::LinkDemand, ExternalThreading = true)]
static bool Start(
	String^ connectionString,
	String^ queue


Type: System::String^

The connection string for the instance of SQL Server from which to obtain change notifications.

Type: System::String^

An existing SQL Server Service Broker queue to be used. If null, the default queue is used.

Return Value

Type: System::Boolean

true if the listener initialized successfully; false if a compatible listener already exists.

Exception Condition

The connectionString parameter is NULL.


The connectionString parameter is the same as a previous call to this method, but the parameters are different.

The method was called from within the CLR.


The caller does not have the required SqlClientPermission code access security (CAS) permission.


A subsequent call to the method has been made with an equivalent connectionString parameter but a different user, or a user that does not default to the same schema.

Also, any underlying SqlClient exceptions.

This method starts the listener for the AppDomain for receiving dependency notifications from the instance of SQL Server specified by the connectionString parameter. This method may be called more than once with different connection strings for multiple servers.

If no queue name is specified, SqlDependency creates a temporary queue and service in the server that is used for the entire process, even if the process involves more than one AppDomain. The queue and service are automatically removed upon application shutdown.

For additional remarks, see Start.

.NET Framework
Available since 2.0
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