private void FillDropdown()
        {
            try
            {
                ReportViewModel            reportViewModel      = new ReportViewModel();
                List <ReportDropDownModel> reportDropDownModels = new List <ReportDropDownModel>();

                reportDropDownModels    = reportViewModel.GetDropdown("FoodmenuCategory");
                cmbCategory.ItemsSource = reportDropDownModels;
                //                cmbCategory.Text = " All";
                cmbCategory.IsEditable = true;
                //cmbCategory.IsReadOnly = true;
                cmbCategory.SelectedValuePath = "Id";
                cmbCategory.DisplayMemberPath = "Name";

                reportDropDownModels   = reportViewModel.GetDropdown("Foodmenu");
                cmbProduct.ItemsSource = reportDropDownModels;
                //              cmbProduct.Text = " All";
                cmbProduct.IsEditable = true;
                //cmbProduct.IsReadOnly = true;
                cmbProduct.SelectedValuePath = "Id";
                cmbProduct.DisplayMemberPath = "Name";

                cmbCategory.SelectedValue = ReportDetail.CategoryId;
                cmbProduct.SelectedValue  = ReportDetail.ProductId;
            }
            catch (Exception ex)
            {
                SystemError.Register(ex);
            }
        }