Create a new SharePoint website using Client Side Object Model

We can  create a new SharePoint site as a subsite of the current website using the below given C# code .

We will use the   WebCreationInformation       class to create a new website. You will also need to add using statements for System.Collections.Generic and System.Text.

// Starting with ClientContext, the constructor requires a URL to the 
// server running SharePoint. 
ClientContext context = new ClientContext("http://SiteUrl"); 

WebCreationInformation creation = new WebCreationInformation(); 
creation.Url = "web1"; 
creation.Title = "Hello web1"; 
Web newWeb = context.Web.Webs.Add(creation); 

// Retrieve the new web information. 
context.Load(newWeb, w => w.Title); 
context.ExecuteQuery(); 

label1.Text = newWeb.Title; 

The class WebCreationInformation inherits from class ClientValueObject of Namespace Microsoft.SharePoint.Client