UnityEditor.AssetServer.IsAssetAvailable C# (CSharp) Method

        public static extern int IsAssetAvailable(string guid);
        [MethodImpl(MethodImplOptions.InternalCall)]

 private void ShowAssetsHistory()
 {
     if (AssetServer.IsAssetAvailable(this.m_ChangeLogSelectionGUID) != 0)
     {
         string[] guids = new string[] { this.m_ChangeLogSelectionGUID };
         this.m_FileViewWin.SelType = ASHistoryFileView.SelectionType.Items;
         AssetServer.SetSelectionFromGUIDs(guids);
     }
     else
     {
         this.m_FileViewWin.SelectDeletedItem(this.m_ChangeLogSelectionGUID);
         this.DoLocalSelectionChange();
     }
 }