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The readonly attribute makes a form control non-editable (or “read only”). A read-only field can't be modified, but, unlike disabled , you can tab into it, highlight it, and copy its contents. Setting the value to null does not remove the effects of the attribute. Instead use removeAttribute('readonly') .
HTML5 Forms: Readonly Type Attribute | Wufoo
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HTML input readonly Attribute - W3Schools
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Add("readonly", "readonly"); From MSDN, The Text value of a TextBox control with the ReadOnly property set to true is sent to the server when a postback occurs, but the server does no processing for a read-only text box. This prevents a malicious user from changing a Text value that is read-only.
How to make textbox as not editable in asp.net(c#) - Stack Overflow
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