[repost]How to delete multiple checked items in a ListView?

protected void btndelete_Click(object sender, EventArgs e)
{
    DataTable dt = new DataTable();
 
    for (int i = 0; i < listview1.Items.Count; i++)
    {
        ListViewDataItem items = listview1.Items[i];
        CheckBox chkBox = (CheckBox)items.FindControl("chkdel");
 
        if (chkBox.Checked == true)
        {
            if (Session["CurrentTable"] != null)
            {
                dt = (DataTable)Session["CurrentTable"];
                dt.Rows.RemoveAt(i);

            }
        }
        else
        {
        }
           dt.AcceptChanges();//You are missing this line
    }
 
    Session["CurrentTable"] = dt;
    listview1.DataSource = dt;
    listview1.DataBind();
    BindDataToGridviewDropdownlist();     
}