I have a multiline radtextbox with maxlength property in which i want copy paste functionality to work ,when i copy some data and paste in radtextbox its showing javascript error in IE,when i remove maxlength its allowing me to copy paste,but i want maxlength property also.
Unfortunately I couldn't replicate the issue at my end. Please have a look into the sample code snippet which works fine at my end. The MaxLength property of RadTextBox will sets the maximum number of characters allowed in the text box. So if you are pasting a content which length is greater than MaxLength then RadTextBox will show only the allowed number of character. Please provide your full code if it doesn't help.
With reference to this forum thread RadTextBox have Issue with Copy/Paste in MultiLine TextMode. If you are using older Telerik version please try to upgrade the Telerik version.