Ajax, Update Panel, Script Manager, Update Controls Outside Update Panel With Out Postback

Here my first post is regarding Ajax.
So here I am going to give you a simple example how to update the controls outside the update panel without postback

Code behind file


using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class scriptMgr : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = "Label1 upadte" + DateTime.Now.ToString();
Label2.Text = "Label2 updated" + DateTime.Now.ToString();
if (ScriptManager1.IsInAsyncPostBack)
{

ScriptManager1.RegisterDataItem(Label3, DateTime.Now.ToString());
}
}
protected void Button2_Click(object sender, EventArgs e)
{
Label1.Text = "Label1 " + DateTime.Now.ToString();
Label2.Text = "Label2 " + DateTime.Now.ToString();
if (ScriptManager1.IsInAsyncPostBack)
{
ScriptManager1.RegisterDataItem(Label3, "Label3 "+DateTime.Now.ToString());
}
}
}



Aspx page

 <div>
        <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
        <script type="text/javascript" language="javascript">
        Sys.WebForms.PageRequestManager.getInstance().add_pageLoading(PageLoadingHandler);
        function PageLoadingHandler(sender, args) {
            var dataItems = args.get_dataItems();
            if ($get('Label3') != null)
                $get('Label3').innerHTML = dataItems['Label3'];
         
        }
    </script>
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <ContentTemplate>
            <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label><br />
            <asp:Label ID="Label2" runat="server" Text="Label"></asp:Label><br />
            <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" /><br />
        </ContentTemplate>
            <Triggers>
                <asp:AsyncPostBackTrigger ControlID="Button2" EventName="Click" />
            </Triggers>
        </asp:UpdatePanel>
       
        <asp:Label ID="Label3" runat="server" Text="krwelkr"></asp:Label>
        <asp:Button ID="Button2" runat="server" Text="Button" onclick="Button2_Click" />
    </div>
  

You can find Ajax Books

Professional ASP.NET 3.5 AJAX (Wrox Programmer to Programmer)
Microsoft ASP.NET and AJAX: Architecting Web Applications (PRO-Developer)

Very Simple Linq Usage Sample

Here I will give one very simple linq sample code.

A query that will return each of the items in the people List collection by aliasing the people collection with a variable p and then selecting p (p is of type string remember as the people List is a collection of immutable string objects).

You may notice that query is of type IEnumerable - this is because we know that query will hold an enumeration of type string. When we foreach through the query the GetEnumerator of query is invoked.

protected void Page_Load(object sender, EventArgs e)
{
List people = new List(){
"Sen", "Paulose", "Thomas", "Raju",
"Anil", "Shyam", "Saidwin"
};

IEnumerable query = from p in people select p;
foreach (string person in query)
{
Response.Write(person);
}
}