C# Update Custom Field Text Area

Content

I am trying to update a custom field text area but it is not working.  Can someone please let me know where I am going wrong?  I am able to update regular text fields using the below code but it will not update a text area.

-Andrew W-

Version

February 2016

Code Snippet

             Incident newIncident = new Incident();

GenericField cfield1 = new GenericField();
                cfield1.name = "description_of_issue";
                cfield1.dataType = DataTypeEnum.STRING;
                cfield1.dataTypeSpecified = true;
                cfield1.DataValue = new DataValue();