Checkbox null values

Question

Hello,

 

I have the following code that works if the values are true/false. If I have a null value I get an exception.

 

<ItemTemplate>
    <asp:CheckBox ID="cbApproved" Checked='<%# Convert.ToBoolean(Eval(ValApproved")) %>' runat="server"/>
</ItemTemplate>

 

Any ideas how to fix that?  

 

Thank you in advance.