using System;using System.Collections.Generic;using System.Configuration;using System.Data;using System.Data.SqlClient;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;
public partial class _Default : System.Web.UI.Page{    protected void Page_Load(object sender, EventArgs e)    {        if (!IsPostBack)        {            DataTable dt = new DataTable();            dt.Columns.AddRange(new DataColumn[3] { new DataColumn("regNo", typeof(int)),                        new DataColumn("FirstName", typeof(string)),                        new DataColumn("LastName",typeof(string)) });            dt.Rows.Add(1, "John Hammond", "United States");            dt.Rows.Add(2, "Mudassar Khan", "India");            dt.Rows.Add(3, "Suzanne Mathews", "France");            dt.Rows.Add(4, "Robert Schidner", "Russia");            GridView1.DataSource = dt;            GridView1.DataBind();        }    }    protected void Button2_Click(object sender, EventArgs e)    {        foreach (GridViewRow row in GridView1.Rows)        {            int regNo = Convert.ToInt32(row.Cells[0].Text.Trim());            string firstName = row.Cells[1].Text.Trim();            string lastName = row.Cells[2].Text.Trim();            string boxDay = TxtBoxDay.Text.Trim();            DateTime boxDate = Convert.ToDateTime(TxtBoxDate.Text.Trim());            string hours = DropDownList5.SelectedItem.Text.Trim();            string status = string.Empty;            string authorized = string.Empty;
            CheckBox cbStatus = (CheckBox)row.FindControl("cbStatus");            if (cbStatus.Checked)            {                status = "A";            }            else            {                status = "P";            }
            CheckBox cbAuthorized = (CheckBox)row.FindControl("cbAuthorized");            if (cbAuthorized.Checked)            {                authorized = "O";            }            else            {                authorized = string.Empty;            }            InsertAttendance(regNo, firstName, lastName, boxDay, boxDate, hours, status, authorized);        }        Response.Write("Record Added Successfully!");    }    private void InsertAttendance(int regNo, string firstName, string lastName, string boxDay, DateTime boxDate, string hours, string status, string authorized)    {        using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings[desktop - lfbfl4s.Attendance.dbo].ConnectionString))        {            using (SqlCommand cmd = new SqlCommand())            {                cmd.CommandText = "INSERT INTO AttendanceTable VALUES (@RegNo,@FirstName,@LastName,@BoxDay,@BoxDate,@Hours,@Status,@Authorized)";                cmd.CommandType = CommandType.Text;                cmd.Parameters.AddWithValue("@RegNo", regNo);                cmd.Parameters.AddWithValue("@FirstName", firstName);                cmd.Parameters.AddWithValue("@LastName", lastName);                cmd.Parameters.AddWithValue("@BoxDay", boxDay);                cmd.Parameters.AddWithValue("@BoxDate", boxDate);                cmd.Parameters.AddWithValue("@Hours", hours);                cmd.Parameters.AddWithValue("@Status", status);                cmd.Parameters.AddWithValue("@Authorized", authorized);                cmd.Connection = con;                con.Open();                cmd.ExecuteNonQuery();                con.Close();            }        }    }
    public object desktop { get; set; }}
 
 
showing worng pls help it is almost done