Symptoms
In a Data Event I tried to concatenate a value of a variable in between two quotation marks. Only the first quote was concatenated with the value. I tried the expression editor and typed in manually as well ("value"), neither of them worked. I use Visual Studio 2013.
Diagnoses
The way to add the quotation marks to a value is to add it to the Source field of the Data Locations on a Data Event.
Resolution
Any additional data (i.e. text, punctuation marks, etc.) the needs to be combined with a value should be included in the Source field of the Data Locations on a Data Event.