Apply custom template on a site in programming

Question

Hi;
I search a code in VS (programming) to apply a custom template (WSP) on a SharePoint site empty (black site).
Like in power shell :
$SubWeb = New-SPWeb $SubSiteName -Name $SiteName -UseParentTopNav
$SubWeb.ApplyWebTemplate($SiteTemplate.Name)
Regards;

Answer 1

Here is an example which shows how to create a site collection using a webtemplate:
SPWebApplication webApp = SPWebApplication.Lookup(new Uri("http://win2008"));
using (SPSite site = webApp.Sites.Add("/sites/site1", "SharePoint", null, 1033, null, "administrator", "Administrator", "[email protected]"))
    SPWeb rootWeb = site.RootWeb;
    // Get Solutions Gallery
    SPDocumentLibrary solutions = (SPDocumentLibrary)site.GetCatalog(SPListTemplateType.SolutionCatalog);
    // Upload Solution File with the Web Template
    SPFile solutionFile = solutions.RootFolder.Files.Add("test.wsp", File.ReadAllBytes(@"..\..\test.wsp"));
    // Activate Solution
    SPUserSolution solution = site.Solutions.Add(solutionFile.Item.ID);
    // Activate Features
    Guid solutionId = solution.SolutionId;
    // Activate Site Collection Features
    SPFeatureDefinitionCollection siteFeatures = site.FeatureDefinitions;
    var features = from SPFeatureDefinition f
                   in siteFeatures
                   where f.SolutionId.Equals(solutionId) && f.Scope == SPFeatureScope.Site 
                   select f;
    foreach (SPFeatureDefinition feature in features)
        site.Features.Add(feature.Id, false, SPFeatureDefinitionScope.Site);
    // Get Web Template
    SPWebTemplateCollection webTemplates = site.RootWeb.GetAvailableWebTemplates(1033);
    SPWebTemplate webTemplate = (from SPWebTemplate t
                                 in webTemplates
                                 where t.Title == "test"
                                 select t).FirstOrDefault();
    if (webTemplate != null)
        site.RootWeb.ApplyWebTemplate(webTemplate.Name);
The main thing here is that the site on which a webtemplate is to be applied should be created from a blank template first.
See this for more information:
http://blog.mastykarz.nl/programmatically-creating-sites-site-collections-custom-web-template/
Nadeem Yousuf