Set Custom master page in sharepoint using Event receiver

Steps

OPen your visual studio and add a Event receiver class under the features tab.

And Replace the below code in Visual studio.

Create a sharepoint project. Add a Module to it. I named it as "MasterModule". By default the module will be created with 2 files, Elemnts.xml and Sample.txt.

You can add / create a Custom Masterpage file as per your requirment. For my purpose, i am trying to reuse the existing V4.Master.

Elements XML replace the below code:

<?xml version="1.0" encoding="utf-8"?>
<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
  <Module Name="CustomMasterPage" List="116" Url="_catalogs/masterpage">
    <File Path="CustomMasterPage\Custom.master" Url="Custom.master" Type="GhostableInLibrary" IgnoreIfAlreadyExists="FALSE" />
  </Module>
</Elements>

Event receiver .cs add below code in Feature activated method.

public override void FeatureActivated(SPFeatureReceiverProperties properties)

{

    var parentSite =  properties.Feature.Parent as SPSite;

    if (parentSite != null)

    {

        SPSecurity.RunWithElevatedPrivileges(delegate

        {

            using (var site = new SPSite(parentSite.RootWeb.Url))

            {

                using (var web = site.OpenWeb())

                {

                    web.AllowUnsafeUpdates = true;


string masterPage="CustomMasterPage.master";
    var masterUri = new Uri(web.Url + "/_catalogs/masterpage/" + masterPage);



    web.MasterUrl = masterUri.AbsolutePath;

    web.CustomMasterUrl = masterUri.AbsolutePath;

    web.Update();

                }

            }

        });

Feature Deactivate method:

public override void FeatureDeactivating(SPFeatureReceiverProperties properties)

{

    var parentSite = properties.Feature.Parent as SPSite;

    if (parentSite != null)

    {

        SPSecurity.RunWithElevatedPrivileges(delegate

        {

            using (var site = new SPSite(parentSite.RootWeb.Url))

            {

                using (var web = site.OpenWeb())

                {

                    web.AllowUnsafeUpdates = true;


string masterPage="V4.master";
    var masterUri = new Uri(web.Url + "/_catalogs/masterpage/" + masterPage);



    web.MasterUrl = masterUri.AbsolutePath;

    web.CustomMasterUrl = masterUri.AbsolutePath;

    web.Update();

                }

            }

        });

    }