diff --git a/Distribute_computing/GridDynamics_plugins/IO/GridSystemIOExtensions.vb b/Distribute_computing/GridDynamics_plugins/IO/GridSystemIOExtensions.vb
index 71b3f26..0a56ffb 100644
--- a/Distribute_computing/GridDynamics_plugins/IO/GridSystemIOExtensions.vb
+++ b/Distribute_computing/GridDynamics_plugins/IO/GridSystemIOExtensions.vb
@@ -22,9 +22,13 @@ Public Module GridSystemIOExtensions
             Call writer.Write(B.Length)      ' i64
             Call writer.Write(B)             ' bytes
 
+            Call A.Dispose()
+            Call B.Dispose()
+
             For Each factor In grid.C.Select(Function(cor) cor.B.PopVectorStream(chunkSize))
                 Call writer.Write(factor.Length) ' i64
                 Call writer.Write(factor)        ' bytes
+                Call factor.Dispose()
             Next
         End Using
     End Sub
@@ -36,6 +40,7 @@ Public Module GridSystemIOExtensions
         Return ms
     End Function
 
+    <Extension>
     Public Function LoadGridSystem(stream As Stream) As GridSystem
         Using reader As New BinaryDataReader(stream)
             Dim width% = reader.ReadInt32
diff --git a/Distribute_computing/GridDynamics_plugins/IO/VectorIOExtensions.vb b/Distribute_computing/GridDynamics_plugins/IO/VectorIOExtensions.vb
index 92ea808..cde559c 100644
--- a/Distribute_computing/GridDynamics_plugins/IO/VectorIOExtensions.vb
+++ b/Distribute_computing/GridDynamics_plugins/IO/VectorIOExtensions.vb
@@ -34,27 +34,28 @@ Public Module VectorIOExtensions
             buffers += ms
         Next
 
-        Using writer As New BinaryDataWriter(save)
-            writer.Write(chunkSize)
-            writer.Write(buffers.Count)
+        Dim writer As New BinaryDataWriter(save)
+        writer.Write(chunkSize)
+        writer.Write(buffers.Count)
 
-            Dim index As New List(Of (offset&, size&))
-            Dim offset As Long = 8 + (8 + 8) * buffers.Count
+        Dim index As New List(Of (offset&, size&))
+        Dim offset As Long = 8 + (8 + 8) * buffers.Count
 
-            For Each chunk As MemoryStream In buffers
-                index += (offset, chunk.Length)
-                offset += chunk.Length
-            Next
+        For Each chunk As MemoryStream In buffers
+            index += (offset, chunk.Length)
+            offset += chunk.Length
+        Next
 
-            For Each offsetIndex In index
-                Call writer.Write(offsetIndex.offset)
-                Call writer.Write(offsetIndex.size)
-            Next
+        For Each offsetIndex In index
+            Call writer.Write(offsetIndex.offset)
+            Call writer.Write(offsetIndex.size)
+        Next
 
-            For Each chunk As MemoryStream In buffers
-                Call writer.Write(chunk)
-            Next
-        End Using
+        For Each chunk As MemoryStream In buffers
+            Call writer.Write(chunk)
+        Next
+
+        Call writer.Flush()
     End Sub
 
     <Extension>
diff --git a/Distribute_computing/GridDynamics_plugins/test/Module1.vb b/Distribute_computing/GridDynamics_plugins/test/Module1.vb
index f36bf1e..af568bc 100644
--- a/Distribute_computing/GridDynamics_plugins/test/Module1.vb
+++ b/Distribute_computing/GridDynamics_plugins/test/Module1.vb
@@ -1,11 +1,52 @@
 Imports GridDynamics_plugins
 Imports Microsoft.VisualBasic.Linq
+Imports Microsoft.VisualBasic.MachineLearning.Darwinism.NonlinearGridTopology
 Imports Microsoft.VisualBasic.Math.LinearAlgebra
 
 Module Module1
 
     Sub Main()
+        Call testGrid()
 
+    End Sub
+
+    Sub testGrid()
+        Dim vec As Vector = 22500.Sequence.Select(Function(i) CDbl(i)).AsVector
+        Dim filePath$ = "./test_grid.dat"
+        Dim grid As New GridSystem With {
+            .AC = -999999,
+            .A = vec,
+            .C = vec.Sequence _
+                .Select(Function(null)
+                            Return New Correlation With {.B = vec, .BC = 9999999}
+                        End Function) _
+                .ToArray
+        }
+
+        Using file = filePath.Open
+            Call grid.Serialize(file, 2048)
+        End Using
+
+        Dim newGrid As GridSystem
+
+        Using file = filePath.Open
+
+            newGrid = file.LoadGridSystem
+
+        End Using
+
+        Dim X As Vector = Replicate(1.0E-200, vec.Length).AsVector
+
+        Dim result1 = grid.Evaluate(X)
+        Dim result2 = grid.Evaluate(X)
+
+
+        Console.WriteLine(result1 = result2)
+
+        Pause()
+    End Sub
+
+    Sub testVector()
         Dim vec As Vector = 50000.Sequence.Select(Function(i) CDbl(i)).AsVector
         Dim filePath$ = "./test.dat"
 
@@ -29,7 +70,6 @@ Module Module1
         Console.WriteLine(oldSum = newSum)
 
         Pause()
-
     End Sub
 
 End Module