Textbox Losing its Value after Postback on Repeater_ItemCommand.

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C#

ASP.NET

C#4.0

Textbox Losing its Value after Postback on Repeater_ItemCommand.

there is a Linkbutton and a textbox Inside Repeater's ItemTemplate I want to Get the Value of TextBox on Linkbutton Click but it is Showing Empty when im debugging it.

Here's Code-

protected void Page_Load(object sender, EventArgs e)
   {

       if (!Page.IsPostBack)
       {
           if (Session["MyCart"] != null)
           {
               Cart.DataSource = ((DataTable)(Session["MyCart"])).DefaultView;
               Cart.DataBind();
               Cart.Items[0].Visible = false;
           }
           else
           {
               Response.Redirect("Products.aspx");
           }
       }

   }
   protected void Cart_ItemCommand(object source, RepeaterCommandEventArgs e)
   {
       if (e.CommandName == "UpdateCart")
       {
           string Pid = e.CommandArgument.ToString();
           TextBox txtquantity = (TextBox)e.Item.FindControl("txtQuantity");

           DataTable dt = new DataTable();
           dt = (DataTable)(Session["MyCart"]);
           //// Get all DataRows where the name is the name you want.
           IEnumerable<DataRow> rows = dt.Rows.Cast<DataRow>().Where(r => r["Pid"].ToString() == Pid);
           //// Loop through the rows and change the name.
           rows.ToList().ForEach(r => r.SetField("Quantity", int.Parse(txtquantity.Text)));
           Session["MyCart"] = dt;
           Cart.DataSource = ((DataTable)(Session["MyCart"])).DefaultView;
           Cart.DataBind();
           Cart.Items[0].Visible = false;
       }

   }