How to Create Office 365 Website using Client Object Model ?

Let's cut to the chase. Here's the code below:

/// <summary>
/// Creates the child site.
/// </summary>
/// <param name="parentSiteUrl">The parent site URL.</param>
/// <param name="adminUsername">The admin username.</param>
/// <param name="adminPassword">The admin password.</param>
/// <param name="newWebsiteInfo">The new website information.</param>
/// <returns>a <see cref="bool"/> indicating if the site was created with success or not</returns>
bool CreateChildSite(string parentSiteUrl, string adminUsername, string adminPassword, WebCreationInformation newWebsiteInfo )
// by default assume the function will fail. Just to be on the safe side.
bool output = false;
// create a clientContext from the provided parent site
// and get the collection of all the webs below the parent site
ClientContext clientContext = new ClientContext(parentSiteUrl);
WebCollection currentListOfWebs = clientContext.Web.Webs;

// encrypt the password in a secure string and add to the current context
SecureString password = new SecureString();
foreach (char c in adminPassword.ToCharArray())
// add the credentials to the clientContext. This will avoid the nasty 403: Forbidden errors.
clientContext.Credentials = new SharePointOnlineCredentials(adminUsername, password);

// create a new web object using the websiteinfo provided
// and add to the collection to make sure it is under the right parent
Web newWebsite = currentListOfWebs.Add(newWebsiteInfo);

// execute the web provisioning

// if got to this point then it was executed with success
output = true;
catch (Exception exception)
// something went wrong, add to the ULS, display some message etc...

return output;

Then what you have to do is to call like in the example below:

/// <summary>
/// Handles the site provisioning call
/// </summary>
protected void ProvisionSite()
WebCreationInformation webCreationInfo = new WebCreationInformation()
Title = "This is my new child site",
Description = "This is the description of my new child site",
Language = 1033,
Url = "childsite1",
UseSamePermissionsAsParentSite = true,
WebTemplate = "STS#0" // team site template
CreateChildSite("https://<yoursite>", "<admin>@<yoursite>", "<your password>", webCreationInfo);

When you publish the app you will see the following screen. Click the Trust button and afterwards you will see your brand new site provisioned under the parent you selected.




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