Add content type to a SharePoint list or library through code

In one of my SharePoint projects, there is a requirement like a SharePoint site has 140+ sub sites and each web has 2 lists which I need to update. There are 2 content types which are inheriting by each list and now I have to add another through coding. It is very difficult to go through all webs and each list in each web and manually add it. So, thought of writing a simple script which will loop through them and update them. So, here is the code I came up with.

private void AddContentTypeToLibraries(string siteUrl)
{
List<SPContentType> contentTypes = new List<SPContentType>();
using (SPSite site = new SPSite(siteUrl))
{
using (SPWeb web = site.OpenWeb())
{
contentTypes.Add(web.ContentTypes["ContentType1"]);
contentTypes.Add(web.ContentTypes["ContentType2"]);
contentTypes.Add(web.ContentTypes["ContentType3"]);
}
foreach (SPWeb web in site.AllWebs)
{
try
{
web.AllowUnsafeUpdates = true;

foreach (SPList list in web.Lists)
{
if (!list.Title.Equals("MyList", StringComparison.InvariantCultureIgnoreCase))
continue;

for (int i = 0; i < contentTypes.Count; i++)
{
AddContentTypeToList(contentTypes[i], list);
}
}
}
catch { }
finally
{
web.AllowUnsafeUpdates = false;
web.Dispose();
}
}
}
}

void AddContentTypeToList(SPContentType ct, SPList list)
{
if (list.ContentTypes[ct.Name] == null)
{
list.ContentTypes.Add(ct);
list.Update();
}
}

The first method is what we are looping through all webs and go to each list and try to add a content type. And the second method is before adding a content type to a list, we are checking whether the content type is already there or not for that list. So, we are checking for that condition and if find the content type is not already attached to the list then only we are adding to the list.

Hope you understand the logic and how we need to implement it.