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Set up Max length for a Multiline TextBox  RSS feed

Sam Saha
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I have a MultiLine Textbox and I want to set its max length to 70. Now it is allowing me to enter unlimited. But I want to make the max to 70. I am using the setLength(10). But it is not working. I am providing my code here for this dynamic field. I would appreciate if someone can help me out to set up this field max to 70. Thanks!!

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