ASP.NET Tutorial/Configuration/customErrors

Custom Error Messages

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <system.web>
    <customErrors 
    mode="On" 
    defaultRedirect="Default.aspx"
    /> 
 </system.web>
</configuration>

Disable custom errors

File: Web.Config
<configuration>
    <system.web>
      <customErrors mode="Off" />
    </system.web>
</configuration>