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Hi guys,
I have created a solution for the following question:
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int[] Inventory = new int[UniqueISBN.Length];
Parallel.For(0, UniqueISBN.Length, Index =>
    OleDbCommand_Update.CommandText = string.Join(null, "Select Count(*) From BookTable Where ISBN = '", UniqueISBN[Index], "'");
    Inventory[Index] = (int)OleDbCommand_Update.ExecuteScalar();
    OleDbCommand_Update.CommandText = string.Join(null, "Update BookTable Set Inventory = ", Inventory[Index], " Where ISBN = '", UniqueISBN[Index], "'");
Parallel.For(0, UniqueISBN.Length, Index =>
    EnumerableRowCollection<DataRow> Query = from Row in BookDataView.Table.AsEnumerable() where Row.Field<string>("ISBN") == UniqueISBN[Index] select Row;
    Parallel.ForEach(Query, Row =>
        Row["Inventory"] = Inventory[Index];

But when I delete multiple rows, I get the following error:
Managed Debugging Assistant 'RaceOnRCWCleanup' : 'An attempt has been made to free an RCW that is in use. The RCW is in use on the active thread or another thread. Attempting to free an in-use RCW can cause corruption or data loss.'

What caused this error and how can it be fixed?
I use the following tools:
.NET Framework 4.5.2, WPF

What I have tried:

Click to see what I tried

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