Extending Gridview to implement partial paging

 /// 

 /// Extended Gridview that supports Custom Paging w/o using ObjectDataSource
 /// - wfp May 30, 2008
 /// 
 public class CustomGridView : GridView
 {
     public CustomGridView() : base() { }

     [Browsable(true), Category("RafnexProperties")]
     [Description("Set the virtual item count for this gridview")]
     [DefaultValue (-1)]
     public int VirtualCount
      {
          get { return ViewState["virtualcount"]==null? -1 : (int)ViewState["virtualcount"]; }
          set { ViewState["virtualcount"] = value; }
      }

     private int CurrentPageIndex
      {
          get
          {
              return ViewState["cur_pIndex"] == null ? 0 : (int)ViewState["cur_pIndex"];
          }
          set
          {
              ViewState["cur_pIndex"] = value;
          }
      }

     public override object DataSource
     {
         get
         {
             return base.DataSource;
         }
         set
         {
             base.DataSource = value;
             //save current page index, this.PageIndex value will be reset along the way(i dont know which event =P ) so we need to save it to be able to use it on InitializePager - wfp
             this.CurrentPageIndex = this.PageIndex;
         }
     }

     protected override void InitializePager(GridViewRow row, int columnSpan, PagedDataSource pagedDataSource)
     {
         if (this.AllowPaging)
         {
             pagedDataSource.AllowCustomPaging = true;
             if (this.VirtualCount > -1) pagedDataSource.VirtualCount = this.VirtualCount;
             pagedDataSource.CurrentPageIndex = this.CurrentPageIndex;
         }

         base.InitializePager(row, columnSpan, pagedDataSource);
     }
 }

Extending Gridview to implement partial paging