Deletion code using LINQ

We use the following code to delete from the database using LINQ:-

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.Linq;

public partial class Insert_LINQ_To_SQL : System.Web.UI.Page
    protected void Page_Load(object sender, EventArgs e)

    protected void Button1_Click(object sender, EventArgs e)
        //create the object of data context class and pass the connection string
        DataContext dc = new DataContext("Data Source=ISHA-PC;Initial Catalog=TechAltum;Integrated Security=True");

        //create object of class which mapped the table in database
        Class1 cal_data;

        //set the where clause for delete the data
        cal_data = dc.GetTable<Class1>().Single(res => == Convert.ToInt32(TextBox1.Text));

        //add object to the delete method


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