SelectedValue which is invalid because it does not exist in the list of items.\r\nParameter name: value"      string

<asp:DropDownList Runat="server" ID="currency" CssClass="form" Width=60  />
 
private void Bind_Currency()
        {
            string strSql = "SELECT id,currency from currency order by id";
            DataSet ds = new DataSet();
            try
            {
                ds = SqlHelper.ExecuteDataset(DBConnection.ConnString, CommandType.Text, strSql);
            }
            catch (Exception)
            {
                Response.Redirect("../error.aspx", true);
            }
            this.currency.DataSource = ds.Tables[0].DefaultView;
            this.currency.DataTextField = "currency";
            this.currency.DataValueField = "currency";
            try
            {
                this.currency.DataBind(); //throw exception
            }
            catch (Exception e)
            {
                string r = e.ToString();
            }
        }

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