how to remove a specific columan through a remove button from a repeater on server side the code given below

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ASP

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

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

}
//public class SessionDataDisplay1
//{
// private string _quantity;
// private string _price;
// public SessionDataDisplay1(string quantity, string price)
// {
// this._quantity = quantity;
// this._price = price;
// }
// public string Quantity
// {
// get {return _quantity;}
// }
// public string Price
// {
// get { return _price; }
// }
//}

public class SessionDataDisplay
{
private string _name;
private string _value;

//public string Quantity { get; set; }
//public string Price { get; set; }
//public string total { get; set; }
public SessionDataDisplay(string name, string value)
{
this._name = name;
this._value = value;
//this.Quantity = quantity;
}
public string Name
{
get { return _name; }
}
public string Value
{
get { return _value; }
}
//public string Quantity1
//{
// get { return Quantity; }
//}
}
protected void RefreshRepeater()
{
// Use the GetEnumerator method to
// iterate through the session-state.
ArrayList values = new ArrayList();
System.Collections.IEnumerator ie = Session.GetEnumerator();
string currentSessionItemName;
while (ie.MoveNext())
{
currentSessionItemName = (string)ie.Current;
values.Add(new SessionDataDisplay(currentSessionItemName,
Session[currentSessionItemName].ToString()));

}
// Bind values ArrayList to Repeater control.
Repeater1.DataSource = values;
Repeater1.DataBind();

}


//protected void Repeater1_ItemCommand(object source, RepeaterCommandEventArgs e)
//{

// // Determine which item to remove and
// // use the Remove method to remove it.
// RepeaterItem itemToRemove = e.Item;
// string sessionItemToRemove =
// ((Label)itemToRemove.FindControl("lblSno")).Text;
// Session.Remove(sessionItemToRemove);
// // Refresh the Repeater control.
// RefreshRepeater();
//}



protected void btnAdd_Click(object sender, EventArgs e)
{
filldatatable();
// If both name and value are specified
// use the Add method to add the item to session-state.
//if (!String.IsNullOrEmpty(txtSno.Text) &
// !String.IsNullOrEmpty(txtItems.Text))
//{
// string itemName = Server.HtmlEncode(txtSno.Text);
// string itemValue = Server.HtmlEncode(txtItems.Text);
// Session.Add(itemName, itemValue);
// //Session["itemName"] = txtSno.Text;
// // Refresh the Repeater control.
// RefreshRepeater();
//}
}
public void filldatatable()
{
DataTable dt = new DataTable();
if (!dt.Columns.Contains("ItemSno"))
{
dt.Columns.Add("ItemSno");
}
if (!dt.Columns.Contains("ItemName"))
{
dt.Columns.Add("ItemName");
}
if (!dt.Columns.Contains("ItemQuantity"))
{
dt.Columns.Add("ItemQuantity");
}

if (!dt.Columns.Contains("ItemPrice"))
{
dt.Columns.Add("ItemPrice");
}
if (!dt.Columns.Contains("ItemTotalPrice"))
{
dt.Columns.Add("ItemTotalPrice");
}
if (Session["datatable"] != null)
{
dt = (DataTable)Session["datatable"];
}
DataRow dr = dt.NewRow();

dr[0] = txtSno.Text;

dr[1] = txtItems.Text;

dr[2] = txtQuantity.Text;

dr[3] = txtPrice.Text;
float price;
float quantity;
float totalprice;
price = float.Parse(txtPrice.Text);
quantity = float.Parse(txtQuantity.Text);
totalprice = price * quantity;
txtTotalPrice.Text = totalprice.ToString();
dr[4] = txtTotalPrice.Text;
//////////////////////////////////////


dt.Rows.Add(dr);

if (Session["datatable"] == null)
{
Session["datatable"] = dt;
}

Repeater1.DataSource = dt;
Repeater1.DataBind();
///////////////////////////////////////////
//float firstno;
//float secondno;
//float thirdno;
//firstno = float.Parse(txtfirstno.Text);
//secondno = float.Parse(txtsecondno.Text);
//thirdno = firstno + secondno;
//MessageBox.Show(thirdno.ToString());

}

int Total = 0;
protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
{

if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
//gives the sum in string Total.

Total += Convert.ToInt32(DataBinder.Eval(e.Item.DataItem, "ItemTotalPrice"));

}
else if (e.Item.ItemType == ListItemType.Footer)
{

// The following label displays the total
lblGrandTotal.Text = Total.ToString();
}

}
protected void SaveRecords_Click(object sender, EventArgs e)
{
for (int index = 0; index < Repeater1.Items.Count; index++)
{

Label lblSno = Repeater1.Items[index].FindControl("lblSno") as Label;
Label lblItemName = Repeater1.Items[index].FindControl("lblItemName") as Label;
Label lblItemQuantity = Repeater1.Items[index].FindControl("lblItemQuantity") as Label;
Label lblItemPrice = Repeater1.Items[index].FindControl("lblItemPrice") as Label;
Label lblItemTotalPrice = Repeater1.Items[index].FindControl("lblItemTotalPrice") as Label;
//HiddenField ItemName = Repeater1.Items[index].FindControl("ItemName") as HiddenField;


String strConnString = ("Data Source=.;Initial Catalog=PRODUCT;Integrated Security=True");
SqlConnection con = new SqlConnection(strConnString);
string strQuery = "insert into tbl_Product (Sno,ItemName,ItemQuantity,ItemPrice,Total)values('" + lblSno.Text + "','" + lblItemName.Text + "','" + lblItemQuantity.Text + "','" + lblItemPrice.Text + "','" + lblItemTotalPrice.Text + "')";
SqlCommand cmd = new SqlCommand(strQuery, con);
con.Open();
cmd.ExecuteNonQuery();
Response.Write("<script>alert('Data Successfully Saved');</script>");

}
}
protected void btnremove_Click(object sender, EventArgs e)
{
}
}