gistfile1.cs

private static int GetRoleInstanceNumber()
{
    var roleInstanceId = RoleEnvironment.CurrentRoleInstance.Id;
    var li1 = roleInstanceId.LastIndexOf(".");
    var li2 = roleInstanceId.LastIndexOf("_");
    var roleInstanceNo = roleInstanceId.Substring(Math.Max(li1, li2) + 1);
    return Int32.Parse(roleInstanceNo);
}

string connectionString = // Your connection string
int numTopics = 2;
int instanceCount = 2;
int instanceId = GetRoleInstanceNumber();
string topicPrefix = "MyApplicationName";

GlobalHost.DependencyResolver.UseServiceBus(
    connectionString,
    numTopics, 
    instanceCount, 
    instanceId, 
    topicPrefix
);