private void showWgrade()
{
Rblgrade.Items.Clear();
string yearselect = Rblyear.SelectedValue;
if (!string.IsNullOrEmpty(yearselect))
{
LearnSite.BLL.Works wbll = new LearnSite.BLL.Works();
Rblgrade.DataSource = wbll.ShowWgrades(Int32.Parse(yearselect));
Rblgrade.DataTextField = "Wgrade";
Rblgrade.DataValueField = "Wgrade";
Rblgrade.DataBind();
if (Rblgrade.Items.Count > 0)
{
Rblgrade.SelectedIndex = 0;
}
}
}