Asynchronous Methods PART-1

In general, use synchronous methods for the following conditions:

• The operations are simple or short-running.
• Simplicity is more important than efficiency.
• The operations are primarily CPU operations instead of operations that involve extensive disk or network overhead. Using asynchronous methods on CPU bound operations provides no benefits and results in more overhead.
• In general, use asynchronous methods for the following conditions:
• You're calling services that can be consumed through asynchronous methods, and you're using .NET 4.5 or higher.

 

• The operations are network-bound or I/O-bound instead of CPU-bound.
• Parallelism is more important than simplicity of code.
• You want to provide a mechanism that lets users cancel a long-running request.
• When the benefit of switching threads out weights the cost of the context switch. In general, you should make a method asynchronous if the synchronous method blocks the ASP.NET request thread while doing no work.  By making the call asynchronous,  the ASP.NET request thread is not blocked doing no work while it waits for the web service request to complete.
• Testing shows that the blocking operations are a bottleneck in site performance and that IIS can service more requests by using asynchronous methods for these blocking calls.

Gridview in disconnected mode

aspx.cs

using BusinessLayer;
using PropertyLayer;
using System.Data.SqlClient;

namespace Gv_Disconnected_NTier_
{
    public partial class Gv_DisconnectedMode : System.Web.UI.Page
    {
        DataTable d1 = new DataTable();

        protected void Page_Load(object sender, EventArgs e)
        {
            if (Page.IsPostBack == false)
            {
                GvBusinessLayer objBusinessLayer = new GvBusinessLayer();
                d1 = objBusinessLayer.GetStudentDetails("student_records");
                ViewState["d1"] = d1;
                bind();
            }
            else
            {
                 d1 = (DataTable)ViewState["d1"];
            }
        }