Gridview: spostare una riga su e giù con frecce

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 #region Page_Load
  protected void Page_Load(object sender, EventArgs e)
  {
    _settings = ExtensionManager.GetSettings("FeaturedPostsRotator");
    _featuredPostsImages = ExtensionManager.GetSettings("FeaturedPostsImages");

    if (!Page.IsPostBack && !Page.IsCallback)
    {
      BindPosts();
  
      BindSettingsForm();
    }

    BindGrid();

    btnSaveSettings.Click += new EventHandler(btnSaveSettings_Click);
    btnUploadImage.Click += new EventHandler(btnUploadImage_Click);
  }
  #endregion

 #region BindGrid
  protected void BindGrid()
  {
    gridFeaturedPostImages.DataKeyNames = new string[] { _featuredPostsImages.KeyField };
    gridFeaturedPostImages.DataSource = _featuredPostsImages.GetDataTable();
    gridFeaturedPostImages.DataBind();
  }

  #endregion

  #region BindSettingsForm()
  protected void BindSettingsForm()
  {
    chkUseJquery.Checked = false;
    if (bool.Parse(_settings.GetSingleValue("UseExtensionJQuery")))
    {
      chkUseJquery.Checked = true;
    }
  }
  #endregion
#region BindPosts
  private void BindPosts()
  {   
    posts.Sort(delegate(Post p1, Post p2) { return String.Compare(p1.Title, p2.Title); });  
  ddPosts.DataSource = posts;
    ddPosts.DataTextField = "Title";
    ddPosts.DataValueField = "Id";
    ddPosts.DataBind();    
  }
  #endregion 
  
  #region MoveGridViewRows
  protected void MoveGridViewRows(object sender, EventArgs e)  
{  
    
    //DataTable dt = new DataTable();
   // DataTable dtnew = new DataTable();  
  
  Button btnUp = (Button)sender;  
    GridViewRow row = (GridViewRow)btnUp.NamingContainer;  
    // Get all items except the one selected  
    var rows = gridFeaturedPostImages.Rows.Cast<GridViewRow>().Where(a => a != row).ToList();  
    switch (btnUp.CommandName)  
    {  
        case "Up":  
            //If First Item, insert at end (rotating positions)  
            if (row.RowIndex.Equals(0))  
                rows.Add(row);  
            else 
                rows.Insert(row.RowIndex - 1, row);  
            break;  
        case "Down":  
            //If Last Item, insert at beginning (rotating positions)  
            if (row.RowIndex.Equals(gridFeaturedPostImages.Rows.Count - 1))  
                rows.Insert(0, row);  
            else 
                rows.Insert(row.RowIndex + 1, row);  
            break;  
    }  

 
} 
#endregion