无法在文本框中显示总值

I have a program that counts the total values in the database and inserts the total values in a textbox named, txtCartItems.Text. The problem that I am encountering, is that whenever I add the Response.Write() code blocks, It displays the values that I inserted in the table, but it does not put the total values that I inserted in the txtCartItems.Text. And when I remove the Response.Write() code blocks, it displays the counted values in the txtCartItems.Text but I can't view the values that I recently added in the table. All I want is that, whenever I search for an item and add it, I can simultaneously view the values in the table and the total number of values that I inserted in the txtCartItems.Text.I have a program that counts the total values i