Problem with WorkFlowRuntime

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WWF

I have created OrderSystem WorkFlow.

I am hosting workflow in windows application.

I am trying to start workflow runtime I am getting 'unable to open database' error.

This is my code...

string connectionString = "server=10.0.0.24;initial catalog=ROCWorkFlow;Integrated Security=SSPI;";

using (WorkflowRuntime workflowRuntime = new WorkflowRuntime())
{
   ExternalDataExchangeService dataService = new ExternalDataExchangeService();
   workflowRuntime.AddService(dataService);
   workflowRuntime.AddService(new SqlWorkflowPersistenceService(connectionString));
   workflowRuntime.StartRuntime();
}

I am new to WWF... How can I do this