ASP.NET

public void Page_Error(object sender, EventArgs e)
    {
        Response.Write("Error occured...");
        Server.ClearError();
    }

//For paging a Gridview manually we have to handle the Gridview’s PageIndexChanged Event.  
//In the event we need to change the PageIndex of Gridview to the page that user has clicked and again bind the Gridview.

protected void gvPaging_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
   gvPaging.PageIndex = e.NewPageIndex;
   gvPaging.DataBind();
}

//This is all you need to do to make manual paging in the Gridview.
//For manually sorting in Gridview we need to handle the Sorting event of Gridview. Here is the code to do it.

protected void gvSorting_Sorting(object sender, GridViewSortEventArgs e)
{
   DataTable dtSortTable = gvSorting.DataSource as DataTable;

   if (dtSortTable != null)
   {
      DataView dvSortedView = new DataView(dtSortTable);
      dvSortedView.Sort = e.SortExpression + " " + getSortDirectionString(e.SortDirection);

      gvSorting.DataSource = dvSortedView;
      gvSorting.DataBind();
   }
}

private string getSortDirectionString(SortDirection sortDireciton)
{
   string newSortDirection = String.Empty;
   if(sortDirection== SortDirection.Ascending)
   {
       newSortDirection = "ASC";
   }
   else
   {
      newSortDirection = "DESC";
   }
   return newSortDirection
}