title: About RadioButton CheckedChanged event
body: <p>Hi there im using a single TextBox for querying differents types of chossings, for example when i select the first RadioButton (Last Name) I search by Client last name, when i choose second RadioButton (Doc. Code) I search by code and so on, please how can i manage or handle exceptions when for example if user choose "Search by Date" and send a string type?</p>
  
  <p>Im using C# 3.5 - Asp.net</p>
  
  <p>I would like to make it with regular expressions and add that in the RadioButton event, so when users changes radio, he could type just some characters in optionA, other more in Option B, and just dates in OptionC ... (regular expression)</p>
  
  <p>Thanks in advances</p>