Update Redirect Page url programatically

Below is the code to update the Redirect url of a page in sharepoint.

Code snippet:

SPSite site = new SPSite("http://sharepointsite");

SPWeb web = site.OpenWeb();

SPList library = web.Lists["Pages"];

SPQuery query = new SPQuery();

query.Query = "<<Where><Eq><FieldRef Name='ContentType' /><Value Type='Computed'>Redirect Page</Value></Eq></Where><OrderBy><FieldRef Name='Created' Ascending='true' /></OrderBy>";

query.RowLimit = 4;

SPListItemCollection items = library.GetItems(query);

foreach (SPListItem item in items)

  {

     if (item.ContentType.Name == "Redirect Page")

         {

              item.File.CheckOut();

              SPFieldUrlValue urlValue = new SPFieldUrlValue();

              urlValue.Description = "https://www.google.com"; // ValidURL is a correct URL that I've tested

              urlValue.Url = "https://www.google.com";

              item["Redirect URL"] = urlValue;

              item.SystemUpdate(false);

              item.File.CheckIn("", SPCheckinType.MajorCheckIn);                  

         }              

  }