Hello karthi2itnet,

The below markup and code behind will give more idea on how to bind grid on button click and on subsequent Ajax post back:

HTML Mark up:

<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<ig:WebDataGrid ID="WebDataGrid1" runat="server" Height="350px" Width="400px">
</ig:WebDataGrid>
<asp:Button ID="Button1" runat="server" Text="Bind Data" onclick="Button1_Click" />

Code:

protected void Page_Load(object sender, EventArgs e)
{
this.WebDataGrid1.DataSource = Session["data"];
}
protected DataTable getdata()
{
DataTable dt = new DataTable("Cutomer");
dt.Columns.Add("ID", typeof(int));
for (int i = 0; i < 10; i++)
{
dt.Rows.Add(i);
}
return dt;
}
protected void Button1_Click(object sender, EventArgs e)
{
if (Session["data"] == null)
{
Session["data"] = getdata();
}
Setbehavior();
this.WebDataGrid1.DataSource = Session["data"];
}
private void Setbehavior()
{
WebDataGrid1.Behaviors.CreateBehavior<Infragistics.Web.UI.GridControls.Sorting>();
WebDataGrid1.Behaviors.CreateBehavior<Infragistics.Web.UI.GridControls.Paging>();
WebDataGrid1.Behaviors.Paging.PageSize =5;
WebDataGrid1.Behaviors.Paging.PagerMode = Infragistics.Web.UI.GridControls.PagerMode.NumericFirstLast;
WebDataGrid1.Behaviors.CreateBehavior<Infragistics.Web.UI.GridControls.EditingCore>();
WebDataGrid1.Behaviors.EditingCore.Behaviors.CreateBehavior<Infragistics.Web.UI.GridControls.CellEditing>();
WebDataGrid1.Behaviors.EditingCore.Behaviors.CellEditing.EditModeActions.MouseClick = Infragistics.Web.UI.GridControls.EditMouseClickAction.Single;
}

For further details on how to add behavior at runtime please review relevant links from the link below:

<http://help.infragistics.com/NetAdvantage/ASPNET/2011.2/CLR4.0/?page=WebDataGrid_Behaviors.html>

I hope this helps.