VS 2015 - Enable Textbox After Validation Of Prior Textbox

Mar 8, 2016

I have TextBox1 (enabled = true) and TextBox2 (enabled = false) in my WebForm on loading. Both are validated by means of a RegularExpressionValidator.

How can I set TextBox2 enabled = true ONLY AFTER (!) the text inserted in TextBox1 has been validated and accepted as valid ?

Can this be done on client side exclusively or is some code behind absolutely necessary ?

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