asp.net - Check for DbNull in C# -

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asp.net - Check for DbNull in C# -

i finding difficulties in validating next

if(personds.person[0].idfk!= dbnull.value)

this compile time error - cannot applied operands of type 'system.guid , 'system.dbnull'

i think should check:

if(personds.person[0].isidfknull())

c# asp.net sql-server

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