Create wcf service as a web and window service both

Thanks for replying.

Main issues I am getting before hosting the wcf service as a window services are :

(1) When I call the methods defined in my wcf service using jquery, then the wcf service and my application must be in the same solution. If I change the solutions for application and wcf service then I need to Enable cross domain ajax call in wcf service. For this I added Globl.asax file.

protected void Application_BeginRequest(object sender, EventArgs e)
{
HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache);
HttpContext.Current.Response.Cache.SetNoStore();

EnableCrossDmainAjaxCall();
}

private void EnableCrossDmainAjaxCall()
{
HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "*");
if (HttpContext.Current.Request.HttpMethod == "OPTIONS")
{
HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods", "GET, POST");
HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", "Content-Type, Accept");
HttpContext.Current.Response.AddHeader("Access-Control-Max-Age", "1728000");
HttpContext.Current.Response.End();
}
}
Then it works perfectly for ajax call through Jquery.

(2) After adding a Global.asax file in my wcf service, then I cant add an installer to my wcf service to host it as a windows service because of there OnStart and Application_BeginRequest
collisions.

Now these are my issues.
Hope you understand it.