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To create a Site Collection via SharePoint Webservices use admin.asmx whick can be found on the Administration Site.

 

/_vti_adm/admin.asmx

 

Add a Web Reference to the URL name it WSSsdk and use the following example code:

 

 WSSsdk.Admin admService = new WSSsdk.Admin();
            admService.Credentials = System.Net.CredentialCache.DefaultCredentials;
            try
            {
                admService.CreateSite("http://companyweb/sites/firstsite",
                    "First Site", "Van Arthur", 1033, "STS#0",
                    "advworks\\Crmadmin", "Crm Admin",
                    "crmadmin@advworks.msft", "", "");
            }
            catch (System.Web.Services.Protocols.SoapException ex)
            {
                MessageBox.Show("Message:\n" + ex.Message + "\nDetail:\n" +
                    ex.Detail.InnerText +
                    "\nStackTrace:\n" + ex.StackTrace);
            }

 

It is not possible to create a SubSite with this webservice. For creating Subsites/SubWebs use the meetings.asmx which can be found on the website under which you want to create a SubSite.