Question

I have a column in SQL Server of smallint type. I read the row including this field by Ado.net.

When I get DataRow of that SQL Server row, I try to convert it to integer like the following code:

int value = datarow.Field<int>("myColumnName");

Because the field is smallint, I think that I should be converted to int. But it throws an exception saying that

Specified cast is not valid…..

I don’t want to use Convert.ToInt32 or other function. I want to use the field extension methods of Datarow. How can I do that?
EDIT:

datarow.Field<int>("myColumnName"); // doesnt work
datarow.Field<Int16>("myColumnName"); // doesnt work
datarow.Field<short>("myColumnName"); // doesnt work
Convert.ToInt32(datarow["myColumnName"]) // works but i dont want it

Answer 1

See SQL Server Data Type Mappings (ADO.NET).

SMALLINT is a 16-bit integer in SQL Server, so it maps to Int16 in .NET

Therefore, you should use

Int16 value = datarow.Field<System.Int16>("MyColumnName")

to read the value