Instead of using Cascading Dropdown list in AJAX use LINQ

I've seen many of them are using Ajax "Cascading DropdownList" for selecting countries and states and other all .....
But the far better way is to use LINQ(Language Integrated Query) ....
Today i am going to share with you the linq query for selecting state on selection of Country dropdown....:)

Front end Image:

Developing :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page
{
    DataClassesDataContext data = new DataClassesDataContext();
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            var fetch = from m in data.CountryTabs select new { m.C_ID, m.CountryName };
            DropDownList1.DataTextField = "CountryName";
            DropDownList1.DataValueField = "C_ID";
            DropDownList1.DataSource = fetch;
            DropDownList1.DataBind();
        }
    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
      
        
        var fetch = from m in data.StateTabs where m.Cntry_ID==Convert.ToInt32(DropDownList1.SelectedItem.Value) select new {m.StateName};
        DropDownList2.DataTextField = "StateName";
        DropDownList2.DataValueField = "StateName";
        DropDownList2.DataSource = fetch;
        DropDownList2.DataBind();



    }
}

Instead of using Cascading Dropdown list in AJAX use LINQ

I've seen many of them are using Ajax "Cascading DropdownList" for selecting countries and states and other all .....
But the far better way is to use LINQ(Language Integrated Query) ....
Today i am going to share with you the linq query for selecting state on selection of Country dropdown....:)

Front end Image:

Developing :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page
{
    DataClassesDataContext data = new DataClassesDataContext();
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            var fetch = from m in data.CountryTabs select new { m.C_ID, m.CountryName };
            DropDownList1.DataTextField = "CountryName";
            DropDownList1.DataValueField = "C_ID";
            DropDownList1.DataSource = fetch;
            DropDownList1.DataBind();
        }
    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
      
        
        var fetch = from m in data.StateTabs where m.Cntry_ID==Convert.ToInt32(DropDownList1.SelectedItem.Value) select new {m.StateName};
        DropDownList2.DataTextField = "StateName";
        DropDownList2.DataValueField = "StateName";
        DropDownList2.DataSource = fetch;
        DropDownList2.DataBind();



    }
}

Understanding C#

Before going towards ASP.NET the use of C# or VB.NET is important.Because as i said that ASP.NET is compiled using VB.NET/C# compiler. That means these are the code behind file, in which the logic would be sustained and the ".aspx" (Active Server Page Extension)is the Source file which contains Desigining part.