protected void uiGridViewEnvelops_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            if (e.CommandName == "EditEnvelop")
            {
                Envelops objData = new Envelops();
                objData.LoadByPrimaryKey(Convert.ToInt32(e.CommandArgument.ToString()));

                if(!objData.IsColumnNull("ColorID"))
                    uiDropDownListColor.SelectedValue = objData.ColorID.ToString();
                if (!objData.IsColumnNull("DimensionID"))
                    uiDropDownListDim.SelectedValue = objData.DimensionID.ToString();

                uiTextBoxPrice.Text = objData.Price.ToString();

                uiPanelAllCats.Visible = false;
                uiPanelEditCat.Visible = true;
                CurrentEnvelop = objData;

                BindCats();
            }
            else if (e.CommandName == "DeleteEnvelop")
            {
                try
                {
                    Envelops objData = new Envelops();
                    objData.LoadByPrimaryKey(Convert.ToInt32(e.CommandArgument.ToString()));
                    objData.MarkAsDeleted();
                    objData.Save();
                    CurrentEnvelop = null;
                    BindCats();
                }
                catch (Exception ex)
                {
                    return;
                }
            }
        }
        protected void uiLinkButtonOK_Click(object sender, EventArgs e)
        {
            Envelops envelop = new Envelops();
            if (CurrentEnvelop == null)
            {
                envelop.AddNew();
                envelop.UploadDate = DateTime.Now;
            }
            else
                envelop = CurrentEnvelop;

            envelop.ColorID = Convert.ToInt32(uiDropDownListColor.SelectedValue);
            envelop.DimensionID = Convert.ToInt32(uiDropDownListDim.SelectedValue);
            double price = 0;
            double.TryParse(uiTextBoxPrice.Text, out price);
            envelop.Price = price;

            if (uiFileUploadImage.HasFile)
            {
                string filepath = "/images/Envelop/" + DateTime.Now.ToString("ddMMyyyyhhmmss") + "_" + uiFileUploadImage.FileName;
                uiFileUploadImage.SaveAs(Server.MapPath("~" + filepath));
                envelop.ImagePath = filepath;
            }
            envelop.Save();
            ClearFields();
            CurrentEnvelop = null;
            uiPanelEditCat.Visible = false;
            uiPanelAllCats.Visible = true;
            BindCats();
        }