Parsing MD5 Values of existent files to determine which files are out of date

EZPPClient Installer/DownloadUtil.cs

@@ -32,8 +32,8 @@ namespace EZPPClient_Installer
               continue;
 
             string[] se = datastring.Split('#');
-            string md5 = se[0];
-            string name = se[1];
+            string md5 = se[0].Replace("\r\n", "").Replace("\r", "").Replace("\n", "");
+            string name = se[1].Replace("\r\n", "").Replace("\r", "").Replace("\n", "");
             md5Files.Add(new MD5File(name, md5));
           }
         }
@@ -53,9 +53,33 @@ namespace EZPPClient_Installer
           downloadList.Add(md5File.getName());
       }
       else
+      {
+        /*string[] files = Directory.GetFiles(pathToEZPP, "*");
+        foreach (var file in files)
         {
 
+        }*/
+        foreach(MD5File md5file in md5Files)
+        {
+          string file = pathToEZPP + @"\" + md5file.getName();
+          bool doesExistOnPC = File.Exists(file);
+          if (!doesExistOnPC)
+          {
+            downloadList.Add(md5file.getName());
           }
+          else
+          {
+            string onlineHash = md5file.getMD5();
+            string pcHash = MD5Util.CalculateMD5(file);
+           if(!string.Equals(onlineHash, pcHash))
+            {
+              downloadList.Add(md5file.getName());
+            }
+          }
+        }
+      }
+
+      MessageBox.Show(downloadList.Count + "/" + md5Files.Count + " Files need for update");
 
       return downloadList;
     }

EZPPClient Installer/EZPPClient Installer.csproj

@@ -76,6 +76,7 @@
     </Compile>
     <Compile Include="MD5File.cs" />
     <Compile Include="DownloadUtil.cs" />
+    <Compile Include="MD5Util.cs" />
     <Compile Include="UpdateState.cs" />
     <Compile Include="Util.cs" />
     <Compile Include="MainWindow.xaml.cs">

EZPPClient Installer/MD5Util.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Security.Cryptography;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace EZPPClient_Installer
+{
+  class MD5Util
+  {
+    public static string CalculateMD5(string filename)
+    {
+      using (var md5 = MD5.Create())
+      {
+        using (var stream = File.OpenRead(filename))
+        {
+          var hash = md5.ComputeHash(stream);
+          return BitConverter.ToString(hash).Replace("-", "").ToUpperInvariant();
+        }
+      }
+    }
+  }
+}