object cannot be cast from dbnull to other types for datetime

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report.Print(StringUtils.PadLeft(Convert.ToDateTime(now["MtgDt"]).ToShortDateString(), 33));

The above code throws an error that Object cannot be cast from DBNull to other types. I tried putting a condition of if else but that does not make sense perhaps because DATETIME is non-nullable.
Please help

Posted 12-Jun-15 3:51am

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Sergey Alexandrovich Kryukov 12-Jun-15 10:01am

Other types? Which type would you want to cast DBNull then?
Do you realize that DBNull, not being exactly the same thing as C# and .NET null, still carries the same semantic, meaning "nothing", "no data"? :-)
—SA

[no name] 12-Jun-15 10:12am

It makes perfect sense when you realize that it can be null in the database.

Afzaal Ahmad Zeeshan 14-Jun-15 15:47pm

Why not first check whether the object is null or not.

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OriginalGriff · Accepted Answer · 2015-06-12T04:13:00

DATETIME is non-nullable in .NET - but it isn't in SQL, where NULL is a valid value for a DATETIME column if you configured your DB that way (and the SSMS designer defaults to "nulls allowed" for new columns).

So your database contains a row or rows where the MtgDt column has a NULL value. Either:
1) Fix your DB, replace the NULL values with "reasonable" dates, and change the column design to "NOT NULL"
Or
2) check for DBNull.Value in your code and replace it with a reasonable value (or report an error, whichever is better given your application).

C#

report.Print(StringUtils.PadLeft((now["MtgDt"] == DBNull.Value ? AReasonableDefaultValue : Convert.ToDateTime(now["MtgDt"])).ToShortDateString(), 33));