Calculated field to SUM with NULL data and multiple conditions?

[jdubs]

I'm actually trying to so this is SSRS but was hoping someone could help here?

I am trying to SUM a column based on a condition but it is throwing an #error when it finds any row with NULL data.

What I thought would work is : =IIF(IsNothing(Fields!DollarValue.Value), 0, IIF(Fields!conditionValue.Value = "1", Fields!DollarvalueValue.Value,0))

       where, DollarValue = the column that contains NULL rows and conditionValue = the condition I want to filter the rows on

[sri121]

There is triky situation where in the matrix if you don't have value for the combination and need to display 0 

=iif(sum(Fields!BudgetAmount.Value)=nothing,0,sum(Fields!BudgetAmount.Value))

[jdubs · Accepted solution]

Aaaand, of course as soon as I posted this I figured it out. Needed to specify "Nothing", instead of "0" for the true and false values.