Why Value Is Available When Use Code Behind Attribute Add

Feb 18, 2010

I have a TextBox in my page

<asp:TextBox ID="TextBox1" runat="server" ReadOnly="true"></asp:TextBox>

I am not able to get the changed value ( I have attached a ajax calender with this textbox)

in code behind because it is readonly

I can do this using TextBox1.Attributes.Add("readonly", "readonly"); or I can get the correct last value using Request.Form[TextBox1.UniqueID]

Why value is available when use code behind attribute add

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