After the ASP.net textbox control is set ReadOnly, it cannot be returned. _ Practical Tips

It is strange that there has not been such a strange problem before, in other people's machines can be normal, think of the possible and asp.net version of the relationship.
I use the ASP.net 2.0, when changed to ASP.net 1.0, on the normal, TextBox control Readonly=true, can return.
In ASP.net 1.0, Readonly=true will return it.
In the ASP.net 2.0 is readonly=true will not return.

Way to solve:
<asp:textbox id= "Username" runat= "Server" readonly= "True" ></asp:textbox>
Remove readonly= "True" and change to
<asp:textbox id= "Username" runat= "Server" ></asp:textbox>

Join in the background code to control read-only properties
USERNAME.ATTRIBUTES.ADD ("Readonly", "True");
This enables the read-only textbox control in ASP.net 2.0 to be returned.