//UserConnection userConnection = HttpContext.Current.Session[@"UserConnection"] as UserConnection;
ProcessSchemaManager processSchemaManager = (ProcessSchemaManager)userConnection.GetSchemaManager(@"ProcessSchemaManager");
ProcessSchema processSchema = processSchemaManager.GetInstanceByName(@"UsrAcceptNewOrderInRMQ");
Process process = processSchema.CreateProcess(userConnection);
if (processSchema.Parameters.ExistsByName(@"OrderId"))
{
process.SetPropertyValue(@"OrderId", Guid.Parse("14aa5fdc-9fa5-4688-86cb-50c9aa53f789"));
}
process.Execute(userConnection);