protected void lbuRefresh_Click(object sender, EventArgs e)
 {
     ClearData();
     ClassYear y = new ClassYear();
     DataTable dt = y.GetYear("");
     GridView1.DataSource = dt;
     GridView1.DataBind();
     SetViewState(dt);
 }
 void BindData()
 {
     ClassYear y = new ClassYear();
     DataTable dt = y.GetYear("");
     GridView1.DataSource = dt;
     GridView1.DataBind();
     SetViewState(dt);
 }