'PriceCheck' is not defined

[mo]

I'm having trouble deciphering the following error messgae. How and where
exactly do I define 'PriceCheck'?
Error:

Compiler Error Message: BC30002: Type 'PriceCheck' is not defined.

Source Error:

Line 29: <asp:TemplateColumn HeaderText="In Stock">
Line 30: <ItemTemplate>
Line 31: <asp:Label id=lblInStock runat="server" Text='<%#
CType(Page, PriceCheck).GetInStockString(Container.DataItem("u nitsinstock"))
%>'>
Line 32: </asp:Label>
Line 33: </ItemTemplate>

[William Ryan]

In line 31 you are Casting Page to type PriceCheck
"mo" <m.********@nospam.qmul.ac.uk> wrote in message
news:bt**********@beta.qmul.ac.uk...

I'm having trouble deciphering the following error messgae. How and where
exactly do I define 'PriceCheck'?
Error:

Compiler Error Message: BC30002: Type 'PriceCheck' is not defined.

Source Error:

Line 29: <asp:TemplateColumn HeaderText="In Stock">
Line 30: <ItemTemplate>
Line 31: <asp:Label id=lblInStock runat="server" Text='<%#
CType(Page, PriceCheck).GetInStockString(Container.DataItem("u nitsinstock")) %>'>
Line 32: </asp:Label>
Line 33: </ItemTemplate>