complete login function and login window also add attached properties and helper classes for securestring

Server Dashboard/Security/SecureStringHelpers.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+using System.Security;
+using System.Text;
+
+namespace Server_Dashboard {
+    public static class SecureStringHelpers {
+        public static string Unsecure(this SecureString secureString) {
+            if (secureString == null)
+                return string.Empty;
+            var unmanagedString = IntPtr.Zero;
+
+            try {
+                unmanagedString = Marshal.SecureStringToGlobalAllocUnicode(secureString);
+                return Marshal.PtrToStringUni(unmanagedString);
+            } finally {
+                Marshal.ZeroFreeGlobalAllocUnicode(unmanagedString);
+            }
+        }
+    }
+}