I'm working on a homework in which i need to create a Pizza order form. I've created the form along with the code but when i debug it, it gives me error. Errors below:(i've attached my code)

C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(113) : error BC30451: Name 'txtSurname' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(118) : error BC30451: Name 'txtSurname' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(119) : error BC30451: Name 'txtForename' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(120) : error BC30451: Name 'txtAddress' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(121) : error BC30451: Name 'txtAddress02' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(122) : error BC30451: Name 'txtTown' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(123) : error BC30451: Name 'txtPostcode' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(131) : error BC30451: Name 'txtSurname' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(134) : error BC30451: Name 'txtAddress' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(137) : error BC30451: Name 'txtPostcode' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(151) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(152) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(154) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(156) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(158) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(187) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(189) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(189) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(257) : warning BC42105: Function 'addDrinks' doesn't return a value on all code paths. A null reference exception could occur at run time when the result is used.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(272) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(274) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(275) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(276) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(276) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(277) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(277) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(282) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(283) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(284) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(285) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(289) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(291) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(292) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(293) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(293) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(294) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(294) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(299) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(300) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(301) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(302) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(363) : error BC30451: Name 'txtSurname' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(364) : error BC30451: Name 'txtForename' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(365) : error BC30451: Name 'txtAddress' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(366) : error BC30451: Name 'txtAddress02' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(367) : error BC30451: Name 'txtTown' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(368) : error BC30451: Name 'txtPostcode' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(385) : error BC30451: Name 'txtSurname' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(386) : error BC30451: Name 'txtForename' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(387) : error BC30451: Name 'txtAddress' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(388) : error BC30451: Name 'txtAddress02' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(389) : error BC30451: Name 'txtTown' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(390) : error BC30451: Name 'txtPostcode' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(396) : error BC30451: Name 'txtSurname' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(397) : error BC30451: Name 'txtForename' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(398) : error BC30451: Name 'txtAddress' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(399) : error BC30451: Name 'txtAddress02' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(400) : error BC30451: Name 'txtTown' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(401) : error BC30451: Name 'txtPostcode' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(414) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(415) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(416) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(418) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(419) : error BC30451: Name 'i' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(451) : error BC30451: Name 'txtSurname' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(452) : error BC30451: Name 'txtForename' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(452) : error BC30451: Name 'txtAddress' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(453) : error BC30451: Name 'txtAddress02' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(453) : error BC30451: Name 'txtTown' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(454) : error BC30451: Name 'txtPostcode' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(500) : error BC30451: Name 'txtForename' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(500) : error BC30451: Name 'txtSurname' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(502) : error BC30451: Name 'txtAddress' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(505) : error BC30451: Name 'txtAddress02' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(506) : error BC30451: Name 'txtAddress02' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(510) : error BC30451: Name 'txtTown' is not declared.
C:\Users\Vasquez\Documents\Visual Studio 2005\Projects\Pizza Order\Pizza Order\Form1.vb(510) : error BC30451: Name 'txtPostcode' is not declared.

Read the error message. You have to declare the variables and objects with types. Without seeing the form (and properties) I can only assume you created text boxes but left them with the default names (like TextBox1) instead of renaming them (like txtTown). Also, for loop variables you can declare them as

Dim i As Integer

For i = 0 to limit

or, more concisely

For i As Integer = 0 to limit