Command. Execute Scalar Async(CancellationToken) Method
An asynchronous version of ExecuteScalar(), which executes the query asynchronously and returns the first column of the first row in the result set returned by the query. Additional columns or rows are ignored.
The cancellation token can be used to request that the operation be abandoned before the command timeout elapses. Exceptions will be reported via the returned Task object.
public: override System::Threading::Tasks::Task<System::Object ^> ^ ExecuteScalarAsync(System::Threading::CancellationToken cancellationToken);
public override System.Threading.Tasks.Task<object> ExecuteScalarAsync (System.Threading.CancellationToken cancellationToken);
override this.ExecuteScalarAsync : System.Threading.CancellationToken -> System.Threading.Tasks.Task<obj>
The cancellation instruction.
Calling ExecuteScalarAsync(CancellationToken) more than once for the same instance before task completion.
Context Connection=true is specified in the connection string.
SQL Server returned an error while executing the command text.
A timeout occurred during a streaming operation. For more information about streaming, see SqlClient Streaming Support.
For more information about asynchronous programming in the .NET Framework Data Provider for SQL Server, see Asynchronous Programming.