Retrieve a null database value into a GUID variable using C#

Guid aca_coc_signature_id = (dtDocument.Rows[0].Field<Guid?>(“aca_coc_signature_id”));

The type decorator “?” makes the Guid nullable.

Another approach is:

if (dtDocument.Rows[0].IsNull(“aca_coc_signature_id”))

{

aca_coc_signature_id = System.Data.SqlClient.Guid.Null;

}

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else

{

aca_coc_signature_id = dtDocument.Rows[0].Field<Guid>(“aca_coc_signature_id”);

}

which could be alternatively expressed:

aca_coc_signature_id == dtDocument.Rows[0].IsNull(“aca_coc_signature_id”) ?
System.Data.SqlClient.Guid.Null :
dtDocument.Rows[0].Field<Guid>(“aca_coc_signature_id”);

Adding a single question mark is certainly easier to write. Maintenance may be more difficult if this is not used as a standard.