delete record from gridview which bind with datatable

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text.RegularExpressions;
using System.IO;
using System.Text;
using System.Net.Sockets;
using System.Data;
using System.Web.Security;

namespace SS_Inter.Users
{
    public partial class BuyPackage : System.Web.UI.Page
    {

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                CreateShoppingCart();

            }
        }

        protected void btnSearch_Click(object sender, EventArgs e)
        {
            try
            {
                string[] webserver = new string[] { "whois.internic.net", "whois.ripe.net", "whois.cira.ca", "whois.nic.uk" ,"whois.domain-registry.nl"};

               

                TcpClient objTCPC = new TcpClient(webserver[0], 43);
                string strDomain = txtDomainName.Text + "\r\n";


                byte[] arrDomain = Encoding.ASCII.GetBytes(strDomain);
                Stream objStream = objTCPC.GetStream();
                objStream.Write(arrDomain, 0, strDomain.Length);
                StreamReader objSR = new StreamReader(objTCPC.GetStream(),Encoding.ASCII);

                lblResponse.Text = "<b>" + strDomain +
                "</b><br><br>" + Regex.Replace(objSR.ReadToEnd(), "\n", "<br>");


                string str1 = lblResponse.Text;


                if (str1.IndexOf("match") == -1)
                {
                    Label1.Text = "Not Available";
                }
                else
                {
                    Label1.Text = "Available";
                }

                objTCPC.Close();
            }
            catch (Exception ex)
            {
                lblResponse.Text = ex.ToString();
            } 
        }

        protected void btnAddtoCart_Click(object sender, EventArgs e)
        {
                DataTable dt = (DataTable)Session["dtCart"];
                string CartID = string.Empty;
                if (Session["CartID"] != null)
                {
                    CartID = Session["CartID"].ToString();
                }
                else
                {
                    CartID = Guid.NewGuid().ToString();
                    Session["CartID"] = CartID;
                }


                int packageId = Int32.Parse(ddlPackage.SelectedValue);
             
                DataRow row = dt.NewRow();
                row["CartId"] = CartID;
                row["PackageID"] = packageId;
                row["PackagePrice"] = GetPackagePrice(packageId);
                row["PackageName"] = ddlPackage.SelectedItem.Text;
                row["DomainName"] = txtDomainName.Text;
                row["CreatedID"] = GetMemberID();
                dt.Rows.Add(row);

                gvCart.DataSource = dt;
                gvCart.DataBind();

                Session["dtCart"] = dt;

        }

        private object GetMemberID()
        {
            string memberid="";
           MembershipUser user = Membership.GetUser();
           if (user != null)
           {
              memberid = user.ProviderUserKey.ToString();
           }
           return memberid;
        }

        private decimal GetPackagePrice(int packageId)
        {
            decimal price=0;
            if (packageId == 1)
            {
                price = 1000;
            }
            if (packageId == 2)
            {
                price = 2000;
            }
            if (packageId == 3)
            {
                price = 3000;
            }
            return price;
        }

        private void CreateShoppingCart()
        {
            DataTable dtShoppingCart = new DataTable();
            DataColumn ID = new DataColumn("ID");
            ID.AutoIncrement = true;
            ID.AutoIncrementSeed = 1;
            ID.ReadOnly = true;
            ID.Unique = true;
            DataColumn[] keys = new DataColumn[1];
            keys[0] = ID;
           

            DataColumn CartID = new DataColumn("CartId");
            DataColumn PackageID = new DataColumn("PackageID");
            DataColumn PackageName = new DataColumn("PackageName");
            DataColumn PackagePrice = new DataColumn("PackagePrice");
            DataColumn DomainName = new DataColumn("DomainName");
            DataColumn CreatedID = new DataColumn("CreatedID");

            dtShoppingCart.Columns.Add(ID);
            dtShoppingCart.Columns.Add(CartID);
            dtShoppingCart.Columns.Add(PackageID);
            dtShoppingCart.Columns.Add(PackageName);
            dtShoppingCart.Columns.Add(PackagePrice);
            dtShoppingCart.Columns.Add(DomainName);
            dtShoppingCart.Columns.Add(CreatedID);
             dtShoppingCart.PrimaryKey = keys;

            Session["dtCart"] = dtShoppingCart;
        }

        protected void gvCart_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            if (e.CommandName == "delete")
            {
                int id = Int32.Parse(e.CommandArgument.ToString());
                DataTable dt = (DataTable)Session["dtCart"];
                dt.Rows.Find(id).Delete();
                dt.AcceptChanges();
                Session["dtCart"] = dt;
                               
            }
        }

        protected void gvCart_RowDeleting(object sender, GridViewDeleteEventArgs e)
        {
            gvCart.DataSource = Session["dtCart"] as DataTable;
            gvCart.DataBind();
        }

     

    }
}