SharePoint 2010 Master Pages - Retrieve, Upload and Apply programmatically

protected void Page_Load(object sender, EventArgs e)

{

 try

 { 

  if (!(Page.IsPostBack))

  {

    SPSecurity.RunWithElevatedPrivileges(delegate()

    {

     using (SPSite pageLoadSite = new SPSite(SPContext.Current.Site.ID))

     {

      pageLoadSite.AllowUnsafeUpdates = true;

      using (SPWeb pageLoadWeb = pageLoadSite.OpenWeb())

      {

       pageLoadWeb.AllowUnsafeUpdates = true;

       GetMasterPages(pageLoadWeb);

       UploadMasterPageInMasterPageGallery(pageLoadWeb);

       SetMasterPage(pageLoadWeb);

       pageLoadWeb.AllowUnsafeUpdates = false;

      }

     pageLoadSite.AllowUnsafeUpdates = false;

    }

   });

  }

 }

 catch (Exception ex)

 {

  Throw ex;

 }

}

/// <summary>

/// Retrieves master pages from the master page gallery

/// </summary>

/// <param name="web">spweb object</param>

private void GetMasterPages(SPWeb web)

{

 try

 {

  SPDocumentLibrary masterPageGallery =        

      (SPDocumentLibrary)web.GetCatalog(SPListTemplateType.MasterPageCatalog);

  foreach (SPListItem masterPage in masterPageGallery.Items)

  {

    string displayName = masterPage.DisplayName

    string name = masterPage.Name;

  }

   

   string currentMasterFileName =  

          web.MasterUrl.Substring(web.MasterUrl.LastIndexOf('/') +    

                                  1);

 }

 catch (Exception ex)

 {

  throw new Exception("Exception in RetrieveMasterPages(). Message: " +  
                      ex.Message);

 }

}

/// <summary>

/// Uploads the master page file to master page gallery.

/// </summary>

/// <param name="web">spweb object</param>

private void UploadMasterPageInMasterPageGallery(SPWeb web)

{

 try

 {

  // fuMasterPage is upload control in my project.

  SPDocumentLibrary masterPageGallery =     

       (SPDocumentLibrary)web.GetCatalog(SPListTemplateType.MasterPageCatalog);

  masterPageGallery.RootFolder.Files.Add(
                    masterPageGallery.RootFolder.ServerRelativeUrl 
                            + "/"  

                            + fuMasterPage.FileName, 
                    fuMasterPage.FileBytes,                        
                    true);

  masterPageGallery.Update();

 }

 catch (Exception ex)

 {

    Throw ex;

 }

}

/// <summary>

/// Sets master page for the site.

/// </summary>

/// <param name="web">Website for which master page is to be set.</param>

private void SetMasterPage(SPWeb web)

{

 try

 {

  web.MasterUrl = string.Format("{0}/_catalogs/masterpage/{1}",  

                                 web.ServerRelativeUrl.TrimEnd('/'),          
                                 "MyMater.Master");

  web.Update();

 }

 catch (Exception ex)

 {

  throw new Exception("Unable to set master page for site "
                        + web.Title   
                        + ". Error: " +  

                     ex.Message);

 }

}