protected void LoadViTri()
 {
     ddlVL_ViTri.DataSource     = vitri.DsViTri();
     ddlVL_ViTri.DataTextField  = "TenViTri";
     ddlVL_ViTri.DataValueField = "ID_ViTri";
     ddlVL_ViTri.DataBind();
 }
 private void loadViTri()
 {
     ddlSearchViTri.DataSource     = vt.DsViTri();
     ddlSearchViTri.DataValueField = "ID_ViTri";
     ddlSearchViTri.DataTextField  = "TenViTri";
     ddlSearchViTri.DataBind();
 }