Pass Variable Between Web Pages

Using Vb.net I created a html table with a hyperlink column to another ASPX.Net page. The page I am linking to has a text box that accepts a customer number and a button (NEXT) to link to another ASPX.Net page.  When I link to the first page, the customer number is not in the textbox.  Also, I do not know how to execute the NEXT button so it links to the final page. Any assistance given is appreciated.
Partial Code: 
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If ds.Tables(cust).Rows.Count > 0 Then
   drRowCount = ds.Tables(cust).Rows(0)
   arryCust(count,4) = drRowCount.Item("custID")
End If
Protected Sub WriteTable()
With Response
  .Write ("<tr><td> <a href://newcustomer/newCust.aspx?TextBox="&arryCust&(count,4)"</td></tr>")
End Sub
First Link Page (.aspx):
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<asp: textbox ID="txtCustNo" runat="serve ...