Create Blog sub site programmatically and set permissions of its parent site

public SPWeb Add(
string strWebUrl,
string strTitle,
string strDescription,
uint nLCID,
string strWebTemplate,
bool useUniquePermissions,
bool bConvertIfThere
)

Parameters

strWebUrl
Type: System.String

A string that contains the new website URL relative to the root website in the site collection. For example, to create a website at http://MyServer/sites/MySiteCollection/MyNewWebsite, specify MyNewWebsite, or to create a website one level lower at http://MyServer/sites/MySiteCollection/Website/MyNewWebsite, specify Website/MyNewWebsite.


strTitle
Type: System.String

A string that contains the title.


strDescription
Type: System.String

A string that contains the description.


nLCID
Type: System.UInt32

A 32-bit unsigned integer that specifies the locale ID.


strWebTemplate
Type: System.String

A string that contains the name of the site definition configuration or site template.
By default, a global site template (GLOBAL#0) is added to all site definitions. You cannot explicitly create a site based on a global site template.


useUniquePermissions
Type: System.Boolean

true to create a subsite that does not inherit permissions from another site; otherwise, false .


bConvertIfThere
Type: System.Boolean

true to convert an existing folder of the same name to a SharePoint site. false to throw an exception that indicates that a URL path with the specified site name already exists.



E.g.: For
Public override void FeatureActivated(SPFeatureReceiverProperties properties)
{
try
{
SPWeb web = properties.Feature.Parent as SPWeb;
CreateBlogSubsite(web);
}
catch (Exception ex)
{
}
}

private void CreateBlogSubsite(SPWeb site)
{

//useUniquePermissions true to create a subsite that does not inherit permissions from another //site; otherwise, false.

using (SPWeb blog = site.Webs.Add(strWebUrl,strTitle,strDescription,nLCID,
strWebTemplate,useUniquePermissions,bConvertIfThere,false, false))
{
blog.Update();
}
}