How to make LINQ statement ThreadSafe?

[GregSenne]

I have a LINQ statement that returns only certain objects from a collection. I keep getting "collection has been modified" errors, because other threads are modifying the "Checks" collection at the same time that this LINQ statement is trying to pull some numbers.

Here's the procedure where I keep getting the "collection was modified" errors:

Public Function GetActualCheckCount() As Int32
       
        Dim RetryCount As Int32 = 0
Retry:  Try 
 
             Return (From x In Checks Where Not x.Status = 3).Count
 
        Catch ex0708 As Exception
            If ex0708.Message.ToLower.Contains("collection was modified") AndAlso RetryCount < 8 Then
                RetryCount += 1
                GoTo Retry
            End If
        End Try
    End Function