Example
string siteUrl = "http://MyServer/sites/MySiteCollection";
string blogDescription = "A new blog Web site.";
int blogLanguage = 1033;
string blogTitle = "Blog Web Site";
string blogUrl = "blogwebsite";
bool blogPermissions = false;
string webTemplate = "BLOG#0";
ClientContext clientContext = new ClientContext(siteUrl);
Web oWebsite = clientContext.Web;
WebCreationInformation webCreateInfo = new WebCreationInformation();
webCreateInfo.Description = blogDescription;
webCreateInfo.Language = blogLanguage;
webCreateInfo.Title = blogTitle;
webCreateInfo.Url = blogUrl;
webCreateInfo.UseSamePermissionsAsParentSite = blogPermissions;
webCreateInfo.WebTemplate = webTemplate;
Web oNewWebsite = oWebsite.Webs.Add(webCreateInfo);
clientContext.Load(
oNewWebsite,
website => website.ServerRelativeUrl,
website => website.Created);
clientContext.ExecuteQuery();
Console.WriteLine("Server-relative Url: {0} Created: {1}", oNewWebsite.ServerRelativeUrl, oNewWebsite.Created);