Why empty cell throws an error during SQL stored procedure execution

Question

SELECT
    CAST ([content_html] AS XML).query(\'/root/Physicians/specialty/a\') AS [Specialty1]
    , CAST ([content_html] AS XML).query(\'/root/Physicians/specialty2/a\         


        

Answer 1

As Gerbenny stated to say in the comments. DBNull won't be picked up by String.IsNullOrEmpty. DBNull is handled differently. to put it in code terms.

DBNull.Value != null

So basically You need to check if an Item is DBNull before trying to display or preforming any actions on it.

Essentially

    <%# Eval("Specialty1") != DBNull.Value ? Eval("Specialty1").ToString() : String.Empty + DisplayMultipleValues(Eval("Specialty2") != DBNull.Value ? Eval("Specialty2").ToString() : String.Empty)
 + etc... %>