Set the fields in Document Library on Page Load

Here is the screenshot that sets the following columns in Document Library:

• Type
• Name
• Author
• Modified By

Here is the code:

private void SetDocumentLibraryWithAuthorSiteColumn()

{

    SPSecurity.RunWithElevatedPrivileges(delegate()

        {

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

            {

                using (SPWeb elevatedWeb = elevatedSite.OpenWeb(SPContext.Current.Web.ID))

                {

                    if (elevatedWeb.Name != "Library")

                    {

                        elevatedWeb.AllowUnsafeUpdates = true;

                        SPList list = elevatedWeb.GetList(SPContext.Current.RootFolderUrl);

                        SPView view = list.Views["All Documents"];

                        if (!list.Fields.ContainsField("_Author"))

                        {

                            // Add existing site cloumn (Author)

                            list.Fields.Add(elevatedWeb.AvailableFields["Author"]);

                            // Delete the following columns from Default View                       

                            if (view.ViewFields.Exists("Modified"))

                                view.ViewFields.Delete("Modified");

                            if (view.ViewFields.Exists("Editor"))

                                view.ViewFields.Delete("Editor");

                            if (view.ViewFields.Exists("CheckoutUser"))

                                view.ViewFields.Delete("CheckoutUser");

                            if (list.Fields.ContainsField("DocmentDescriptionMP"))

                            {

                                if (view.ViewFields.Exists("DocmentDescriptionMP"))

                                    view.ViewFields.Delete("DocmentDescriptionMP");

                            }

                            if (list.Fields.ContainsField("DocmentDescriptionMP"))

                            {

                                if (view.ViewFields.Exists("GLDepartmentMP"))

                                    view.ViewFields.Delete("GLDepartmentMP");

                            }

                            // Add the following columns to Default View                                                

                            view.ViewFields.Add("_Author");

                            view.ViewFields.Add("Editor");

                            view.Update();

                        }

                        list.Update();

                    }

                }

            }

        });

}