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Can I use one RequiredFieldValidator for multiple controls?

Last Modified: 2017-11-14
Hello I have a series of text boxes to record telephone numbers.  Like this:
Phone Number: (<asp:TextBox ID="txtContHomePh1" runat="server" MaxLength="3" Width="32px"></asp:TextBox>
                       <asp:TextBox ID="txtContHomePh2" runat="server" MaxLength="3" Width="31px"></asp:TextBox>
                       <asp:TextBox ID="txtContHomePh3" runat="server" MaxLength="4" Width="49px"></asp:TextBox>

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txtContHomePh1 is the area code, txtContHomePh2 is for the next 3 number, and txtContHomePh3 is for the last 4 digits. I want a RequiredFieldValidator to make sure the user fills out the boxes.  Can I use just 1 for all 3 textboxes? Or do I have to put one on each text box?
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