GridView Update command and checking values

How do I make sure the right values are entered when updating from the GridView? Is there a way to error check?
HangTenDesignAsked:
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hfponCommented:
Convert your boundfields into templatefields;
then put validation control to the textboxes and set those validation control display as dynamic.
For example;

            <asp:TemplateField HeaderText="Effect" SortExpression="sEffect" >
                <EditItemTemplate>
                    <asp:TextBox ID="TextBox2" runat="server" Height="50px" Text='<%# Bind("sEffect") %>'
                        TextMode="MultiLine" Width="150px"></asp:TextBox>
                    <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="TextBox2"
                        Display="Dynamic" ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label2" runat="server" Text='<%# Bind("sEffect") %>' Width="150px"></asp:Label>
                </ItemTemplate>
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HangTenDesignAuthor Commented:
Hi, this is very good but not giving me the desired result. Is there any way to wire a client side javascript function. I manager to put a OnClientClick on the EditTemplate UpdateCommand button but I don't know how to predict the DOM reference of the renderend text box inside the GridView.

Maybe there is another way to do Client side error check and alert box.
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