Beware of Null Values in ASP Database Programs

The Active Server Pages HTMLEncode function is great for handling strings that come from a database, especially if the string includes foreign characters. However, you can get into trouble if the string field in the database is empty; that is, it contains a Null. When it hits a Null, HTMLEncode throws a “Type Mismatch” error. Make sure you check for Nulls whenever you are using HTML-encoding. Here’s sample routine:

 <% Function HTMLEncode(instring)  If Not IsNull(instring) then    HTMLEncode=Server.HTMLEncode(instring)  else     HTMLEncode=""  end ifEnd function%><%dbdatastring=NullResponse.Write HTMLEncode(dbdatastring)dbdatastring="J'ai mal

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