SQLParameter.SqlValue is {Null} but can't test for null?

Returned SQLParameter.SqlValue is {Null} but can't test for null?

In my Stored procedure output parameter return Null value in C# but can't test for null..

Below are my coding :

if (cmd.Parameters["@AswathID"].SqlValue != DBNull.Value) ----> Can't test null here.
{
objDbProperty.AswathAmount = (int)cmd.Parameters["@AswathID"].Value;
}
else
{
objDbProperty.AswathAmount = 0;
}
Kindly Reply me.

Thanks & Regards
Narayanan P