c# - How to restrict user from entering specific chars (xml invalid characters) in textbox? -

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i have problem textbox. user enters text/string in textbox , string exported value of attribute in xml file. there way how can disable user enter (type+paste) forbidden (for xml format) characters, symbol euro €?

instead of restricting user can filter out characters don't want before passing xml. 

string texttopass = replaceinvalidcharacters(yourtextbox.text);   public string replaceinvalidcharacters(string toreplace) {    toreplace = toreplace.replace("€","");    //similarly others unwanted characters     return toreplace; }

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