c# - casting, converting, and input from textbox controls -

Working on some .aspx.cs code and decided that I would forget to change a text box value to a usable integer or decimal. Please warn me I'm very new to .asp I wish I could say the same for C, the value going to my text box (strawberry_textbox) is "1", which I guess I can reach with .text property I am Which I then read pars error in an int that format exception was coded by the user code.

My second question: Can I work on a session variable?

  secure void submit_order_button_click (object sender, EventArgs e) {int strawberryp; Int strawberries; Decimal plus 1 = decimals Purse (moneybox1.Text); Decimal plus 2 = decimals Purse (moneybox2.Text); Decimal plus 3 = decimals Purse (moneybox3.Text); Decimal plus 4 = decimals Purse (moneybox4.Text); Decimal money 5 = decimal Purse (moneybox5.Text); Strawberryp = int.Parse (strawberryp_Textbox.Text); // The problem is right here! Strawberry = Int. Percy (strawberry .text); // need fix int strawberryc = int.Parse (strawberryc_Textbox.Text); // fixed int berryp = int.Parse (berryp_Textbox.Text); // fixed int raspberryp = int.Parse (raspberryp_Textbox.Text); / Fixed decimal sub-sum = (wealth 1 * strawberries) + (plus 2 * strawberries) + (plus 3 * strawberries) + (plus 4 * bit) + (money 5 * raspberries); // Check to check if you can get the decimal and multiplication DCMML !! Session ["passmysubtotal"] = sub-totals; //TextBox2.Text; (Strawberryp_Textbox.Text); // TextBox4.Text; Add_my_order_button.Enabled = true; Add_my_order_button.Visible = true; Submit_order_button.Enabled = false; Submit_order_button.Visible = false; Strawberry_typebox Readonly = false; Strawberrys_textbox.ReadOnly = false; Strawberry citium box. Read only = false; Berryp_Textbox.ReadOnly = false; Raspberryp_Textbox.ReadOnly = false; Response.Redirect ("reciept.aspx"); }  

Thanks for the help