What does {} mean in C#'

I have a DataGridView cell that is of type System.Single. 

if (myDataGridView.Rows[0].Cells[1].Value == null) 
{
    //some code
}

myDataGridView.Rows[0].Cells[1].Value has value {}. It's not null, nor is it 0, what should be on the right hand side of == to make the conditional true?

Jon Skeet
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quotationmark

As noted, the value is an instance of DbNull.

Given that DbNull.Value is a singleton (and thus safe for reference comparisons), two options come to mind:

if (myDataGridView.Rows[0].Cells[1].Value == DBNull.Value)

or

if (myDataGridView.Rows[0].Cells[1].Value is DbNull)

Personally I quite like that latter - it fits in with the "is null" approach within a database, and it reads well... it makes it clearer that I'm interested in nullity as a sort of property rather than performing an actual equality comparison.

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