ASP.NET RequiredFieldValidator on a ReadOnly Textbox

I have a textbox on my form used to hold the value of a date.   Rather than having the user enter a date in the text box the textbox is set to ReadOnly and the user must use a date picker to select a date.  Once they select a date the date value is pasted to the readonly textbox.

My problem is with the RequiredFieldValidator for this ReadOnly textbox.  For some reason when a date is selected and passed to the ReadOnly field the RequiredFieldValidator believes there is nothing there?

How can I fix this?

            <td class="style3">
                    ErrorMessage="Please select a Date from the calendar dropdown." 
                Show Start Date:</td>
                <asp:TextBox ID="tbStartDate" runat="server" ReadOnly="True"></asp:TextBox>
                <obout:Calendar ID="Calendar1" runat="server" 
                    DatePickerImagePath="images/datepicker_icon.gif" DatePickerMode="True" 
                    StyleFolder="obout_calendar/styles/default" TextBoxId="tbShowStartDate">

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This is Here is a workaround for this problem:

1- Delete the ReadOnly attribute from the control declaration. Alternatively, set the ReadOnly attribute to false.

2- Programmatically set the ReadOnly attribute to true.

    protected void Page_Load(object sender, EventArgs e)
        this.TextBox1.ReadOnly = true;

Best wishes,

Ahmed Bedier
Instead of setting ReadOnly, set contenteditable like below:

<asp:TextBox ID="tbStartDate" runat="server" contenteditable="false"></asp:TextBox>

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None of server side validations will work when text box is set to read only. You could either remove read only or could validate it by JavaScript (What to validate: The user enters/picks correct date)
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cdemott33Author Commented:
I was surprised that afumedo solution didn't work, becuase it was from Microsoft.  However the contenteditable="false" worked.  I never heard of that attribute but its works.
Doesn't my comment look like an an answer to your question ?!! did it work for you ?
cdemott33Author Commented:
Unfortunately it didn't work?  I'm not exactly sure why... I mean.. that's what Microsoft has as a fix??? But for me, it didn't make a difference.  The only thing that worked as contenteditable="false".  
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