How check the System.DbNull values from database

[Divas]

Dear Sir
Please help me for below question.

How check the System.DbNull values from database when we retrive the data from databa


Thanx

[SanjuMtr]

Dear Sir
Please help me for below question.

How check the System.DbNull values from database when we retrive the data from databa


Thanx

I have give a pices of code

daHeader.Item("TOTAL_AMOUNT") Is System.DBNull.Value
'daHeader is a datareader