How can the RequiredFieldValidator be bypassed upon clicking "Update" of gridview?

Hi Experts,

I have a form with InsertItemTemplate and a Gridview on the same page. I have a "RequiredFieldValidator" tied to a textbox on the form. Upon clicking "Insert" on the form the RequiredFieldValidator" is fired, but also when the Edit is clicked on the Gridview and Update is clicked, the RequiredFieldValidator fires as well. How can the RequiredFieldValidator tied to the form be disabled if the Edit of the Gridview is enabled?

Thanks

<%@ Page Language="VB" MasterPageFile="~/MasterPage.master" Title="Untitled Page" %>
 
 
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
    <br/>
    <asp:FormView ID="FormView1" runat="server" DataKeyNames="CostCategoryID" DataSourceID="SqlDataSource1"
        DefaultMode="Insert" Width="632px">
        <EditItemTemplate>
            CostCategoryID:
            <asp:Label ID="CostCategoryIDLabel1" runat="server" Text='<%# Eval("CostCategoryID") %>'>
            </asp:Label><br />
            CostCategory:
            <asp:TextBox ID="CostCategoryTextBox" runat="server" Text='<%# Bind("CostCategory") %>'>
            </asp:TextBox><br />
            Description:
            <asp:TextBox ID="DescriptionTextBox" runat="server" Text='<%# Bind("Description") %>'>
            </asp:TextBox><br />
            <asp:LinkButton ID="UpdateButton" runat="server" CausesValidation="True" CommandName="Update"
                Text="Update">
            </asp:LinkButton>
            <asp:LinkButton ID="UpdateCancelButton" runat="server" CausesValidation="False" CommandName="Cancel"
                Text="Cancel">
            </asp:LinkButton>
        </EditItemTemplate>
        <InsertItemTemplate>
            <strong>Cost Category:</strong>
            <asp:TextBox ID="CostCategoryTextBox" runat="server" Text='<%# Bind("CostCategory") %>'></asp:TextBox>
            <strong>Description: </strong>
            <asp:TextBox ID="DescriptionTextBox" runat="server" Text='<%# Bind("Description") %>'
                Width="194px"></asp:TextBox><br />
            <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="CostCategoryTextBox" SetFocusOnError="True" Display="Dynamic" ToolTip="Enter a Cost Category" ErrorMessage="The Cost Category field is required "></asp:RequiredFieldValidator><br />
            <br />
            <asp:LinkButton ID="InsertButton" runat="server" CausesValidation="True" CommandName="Insert"
                Text="Insert"></asp:LinkButton>
            <asp:LinkButton ID="InsertCancelButton" runat="server" CausesValidation="False" CommandName="Cancel"
                Text="Cancel"></asp:LinkButton>
        </InsertItemTemplate>
        
 
 
        <ItemTemplate>
            CostCategoryID:
            <asp:Label ID="CostCategoryIDLabel" runat="server" Text='<%# Eval("CostCategoryID") %>'></asp:Label><br />
            CostCategory:
            <asp:Label ID="CostCategoryLabel" runat="server" Text='<%# Bind("CostCategory") %>'></asp:Label><br />
            Description:
            <asp:Label ID="DescriptionLabel" runat="server" Text='<%# Bind("Description") %>'></asp:Label><br />
            <asp:LinkButton ID="EditButton" runat="server" CausesValidation="False" CommandName="Edit"
                Text="Edit"></asp:LinkButton>
            <asp:LinkButton ID="DeleteButton" runat="server" CausesValidation="False" CommandName="Delete"
                Text="Delete"></asp:LinkButton>
            <asp:LinkButton ID="NewButton" runat="server" CausesValidation="False" CommandName="New"
                Text="New"></asp:LinkButton>
        </ItemTemplate>
 
    </asp:FormView>
    <br />
 
    <asp:GridView ID="GridView1" runat="server" AllowSorting="True" AutoGenerateColumns="False"
        CellPadding="4" DataKeyNames="CostCategoryID" DataSourceID="SqlDataSource1" EmptyDataText="There are no data records to display."
        ForeColor="#333333" GridLines="None" Width="628px">
        <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
        <Columns>
            <asp:BoundField DataField="CostCategory" HeaderText="CostCategory" SortExpression="CostCategory" />
            <asp:BoundField DataField="Description" HeaderText="Description" SortExpression="Description" />
            <asp:CommandField ShowDeleteButton="True" ShowEditButton="True" />
        </Columns>
        <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
        <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
        <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
        <EditRowStyle BackColor="#999999" />
        <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
    </asp:GridView>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:Logistics_Budget_ManagerConnectionString1 %>"
        DeleteCommand="DELETE FROM [Cost Category] WHERE [CostCategoryID] = @CostCategoryID"
        InsertCommand="INSERT INTO [Cost Category] ([CostCategory], [Description]) VALUES (@CostCategory, @Description)"
        ProviderName="<%$ ConnectionStrings:Logistics_Budget_ManagerConnectionString1.ProviderName %>"
        SelectCommand="SELECT [CostCategoryID], [CostCategory], [Description] FROM [Cost Category]"
        UpdateCommand="UPDATE [Cost Category] SET [CostCategory] = @CostCategory, [Description] = @Description WHERE [CostCategoryID] = @CostCategoryID">
        <DeleteParameters>
            <asp:Parameter Name="CostCategoryID" Type="Int32" />
        </DeleteParameters>
        <InsertParameters>
            <asp:Parameter Name="CostCategory" Type="String" />
            <asp:Parameter Name="Description" Type="String" />
        </InsertParameters>
        <UpdateParameters>
            <asp:Parameter Name="CostCategory" Type="String" />
            <asp:Parameter Name="Description" Type="String" />
            <asp:Parameter Name="CostCategoryID" Type="Int32" />
        </UpdateParameters>
    </asp:SqlDataSource>
 
</asp:Content>

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