Created Unassigned: Exception reading float [11806]

I'm using "Add LINQ to SQL Datacontext".

When querying one table I get an InvalidCastException.

var test = from row in db.Batch select row;
foreach (var x in test)
Console.WriteLine(x);

It appears that a column of type float is the problem:
I can get data from other columns:

var test = from row in db.Batch select row.ColumnA; //(not float)

but when I query the column of type float the exception is thrown

var test = from row in db.Batch select row.ColumnB; //(float)