protected void txtProductName_OnTextChanged(object sender, EventArgs e) { objProductBiz = new ProductBiz(); objProduct = new Product(); objProduct = objProductBiz.AddProductDetailsForRP(txtReturnProductName.Text.Trim(), txtInvoiceNumber.Text.Trim()); txtReturnProductCode.Text = objProduct.ProductId.ToString(); txtPurchaseQuantity.Text = objProduct.PurchaseQuantity.ToString(); txtPrice.Text = objProduct.PurchasePrice.ToString(); txtReturnQuantity.Attributes.Add("onfocus", "this.select()"); txtReturnQuantity.Focus(); }