diff --git a/ClosedXML_Sandbox/ClosedXML_Sandbox.csproj b/ClosedXML_Sandbox/ClosedXML_Sandbox.csproj
index 3581c95..2b2d041 100644
--- a/ClosedXML_Sandbox/ClosedXML_Sandbox.csproj
+++ b/ClosedXML_Sandbox/ClosedXML_Sandbox.csproj
@@ -63,6 +63,9 @@
     </None>
     <None Include="app.config" />
     <None Include="packages.config" />
+    <None Include="test.xlsx">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\ClosedXML\ClosedXML.csproj">
diff --git a/ClosedXML_Sandbox/PerformanceRunner.cs b/ClosedXML_Sandbox/PerformanceRunner.cs
index 97d3a31..2d4f570 100644
--- a/ClosedXML_Sandbox/PerformanceRunner.cs
+++ b/ClosedXML_Sandbox/PerformanceRunner.cs
@@ -17,7 +17,8 @@
             Console.WriteLine("Action done in " + stopwatch.Elapsed);
         }
 
-        const int rowCount = 5000;
+        private const int rowCount = 5000;
+
         public static void RunInsertTable()
         {
             var rows = new List<OneRow>();
@@ -39,6 +40,16 @@
             EmulateSave(workbook);
         }
 
+        public static void OpenTestFile()
+        {
+            using (var wb = new XLWorkbook("test.xlsx"))
+            {
+                var ws = wb.Worksheets.First();
+                var cell = ws.FirstCellUsed();
+                Console.WriteLine(cell.Value);
+            }
+        }
+
         private static void CreateMergedCell(IXLWorksheet worksheet)
         {
             worksheet.Cell(rowCount + 2, 1).Value = "Merged cell";
diff --git a/ClosedXML_Sandbox/Program.cs b/ClosedXML_Sandbox/Program.cs
index 0cb47d1..9136cbe 100644
--- a/ClosedXML_Sandbox/Program.cs
+++ b/ClosedXML_Sandbox/Program.cs
@@ -2,11 +2,17 @@
 
 namespace ClosedXML_Sandbox
 {
-    class Program
+    internal class Program
     {
         private static void Main(string[] args)
         {
+            Console.WriteLine("Running {0}", "OpenTestFile");
+            PerformanceRunner.TimeAction(PerformanceRunner.OpenTestFile);
+            Console.WriteLine();
+
+            Console.WriteLine("Running {0}", "RunInsertTable");
             PerformanceRunner.TimeAction(PerformanceRunner.RunInsertTable);
+            Console.WriteLine();
 
             Console.WriteLine("Press any key to continue");
             Console.ReadKey();
diff --git a/ClosedXML_Sandbox/test.xlsx b/ClosedXML_Sandbox/test.xlsx
new file mode 100644
index 0000000..296c174
--- /dev/null
+++ b/ClosedXML_Sandbox/test.xlsx
Binary files differ