Changing MasterPage programmatically for site collection and sub-sites

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using System;

using System.Collections.Generic;

using System.Text;

using Microsoft.SharePoint;

namespace CustomMaster

{

public class ChangeMaster : Microsoft.SharePoint.SPFeatureReceiver

{

public override void FeatureActivated(SPFeatureReceiverProperties properties)

{

SPWeb CurrentWeb = properties.Feature.Parent as SPWeb;

CurrentWeb.MasterUrl = CurrentWeb.Site.RootWeb.ServerRelativeUrl + "/_catalogs/masterpage/MyDefault.master";

CurrentWeb.CustomMasterUrl = CurrentWeb.Site.RootWeb.ServerRelativeUrl + "/_catalogs/masterpage/custom.master";

CurrentWeb.Update();

foreach (SPWeb subweb in Web.GetSubwebsForCurrentUser())

{

ChangeMasterPage(subweb, pstrMasterURL, pstrCustomURL);

}

CurrentWeb.Dispose();

}

void ChangeMasterPage(SPWeb Web, string pstrMasterURL, string pstrCustomURL)

{

Web.MasterUrl = pstrMasterURL;

Web.CustomMasterUrl = pstrCustomURL;

Web.Update();

Web.Dispose();

}

public override void FeatureDeactivating(SPFeatureReceiverProperties properties)

{

SPWeb CurrentWeb = properties.Feature.Parent as SPWeb;

CurrentWeb.MasterUrl = CurrentWeb.Site.RootWeb.ServerRelativeUrl + "/_catalogs/masterpage/default.master";

CurrentWeb.CustomMasterUrl = CurrentWeb.Site.RootWeb.ServerRelativeUrl + "/_catalogs/masterpage/default.master";

CurrentWeb.Update();

}

}

}