how to make a part of the textbox as readonly

Posted by vakas on Stack Overflow See other posts from Stack Overflow or by vakas
Published on 2010-05-27T15:09:41Z Indexed on 2010/05/27 15:21 UTC
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c#

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JavaScript

i have a tagtextbox on my page when a user selects a category that category name goes to tagtextbox

now i want that this category name user cant change but he can append some more tags means first tag becomes readonly and further he can add too in same text box

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