Could you please let me know how you enter a value to RadTextBox
control? In case you set it manually the value should be access on the server without problems. Nevertheless, if you do that dynamically by using a client function then please make sure you get the client object and use set_value
method. You can examine the following help article
for more information.
If you still experience the same issue I would appreciate if you can provide your code declaration in order to investigate the cause for it further.
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