diff --git a/.vs/Roaming.git/FileContentIndex/418e2143-ecba-4ff6-a9bd-41376fe03fcb.vsidx b/.vs/Roaming.git/FileContentIndex/418e2143-ecba-4ff6-a9bd-41376fe03fcb.vsidx
deleted file mode 100644
index 9dc66b5..0000000
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diff --git a/.vs/Roaming.git/FileContentIndex/951119d6-19f8-4a7a-b4f4-84a32139e908.vsidx b/.vs/Roaming.git/FileContentIndex/951119d6-19f8-4a7a-b4f4-84a32139e908.vsidx
new file mode 100644
index 0000000..9f92a01
Binary files /dev/null and b/.vs/Roaming.git/FileContentIndex/951119d6-19f8-4a7a-b4f4-84a32139e908.vsidx differ
diff --git a/.vs/Roaming.git/v17/.suo b/.vs/Roaming.git/v17/.suo
index d2d86c3..0957904 100644
Binary files a/.vs/Roaming.git/v17/.suo and b/.vs/Roaming.git/v17/.suo differ
diff --git a/Roaming/Roaming.cs b/Roaming/Roaming.cs
index ce3387d..304f6ac 100644
--- a/Roaming/Roaming.cs
+++ b/Roaming/Roaming.cs
@@ -264,6 +264,65 @@ namespace Eugen.ESystem
             }
         }
 
+        /// <summary>
+        /// Checks whether the roaming path exists
+        /// </summary>
+        /// <returns>'True' if the roaming path exists, otherwise 'false'</returns>
+        public bool RoamingPathExists()
+        {
+            return Directory.Exists(RoamingPath);
+        }
+
+        /// <summary>
+        /// Checks whether the main key exists
+        /// </summary>
+        /// <returns>'True' if the main key exists, otherwise 'false'</returns>
+        public bool MainKeyExists()
+        {
+            return Directory.Exists(RoamingPath + "\\" + MainKey);
+        }
+
+        /// <summary>
+        /// Checks whether the sub key exists
+        /// </summary>
+        /// <returns>'True' if the sub key exists, otherwise 'false'</returns>
+        public bool SubKeyExists()
+        {
+            return Directory.Exists(RoamingPath + "\\" + MainKey + "\\" + SubKey);
+        }
+
+        /// <summary>
+        /// Checks whether the key exists
+        /// </summary>
+        /// <returns>'True' if the key exists, otherwise 'false'</returns>
+        public bool KeyExists()
+        {
+            return Directory.Exists(RoamingPath + "\\" + MainKey + "\\" + SubKey + "\\" + Key);
+        }
+
+        /// <summary>
+        /// Checks whether the key is 'null' or 'empty'
+        /// </summary>
+        /// <returns>'True' if the key is 'null' or 'empty', otherwise 'false'</returns>
+        public bool ValueIsNullOrEmpty()
+        {
+            if (KeyExists())
+            {
+                if (String.IsNullOrEmpty(ReadKey()))
+                {
+                    return true;
+                }
+                else
+                {
+                    return false;
+                }
+            }
+            else
+            {
+                return true;
+            }
+        }
+
         private string GetAppData()
         {
             return Environment.GetEnvironmentVariable("APPDATA"); //Ermittelt den Pafad des Verzeichnisses '%APPDATA%\Roaming'
diff --git a/Roaming/bin/Debug/heroaming.dll b/Roaming/bin/Debug/heroaming.dll
index 3a2a999..f3eac2c 100644
Binary files a/Roaming/bin/Debug/heroaming.dll and b/Roaming/bin/Debug/heroaming.dll differ
diff --git a/Roaming/bin/Debug/heroaming.pdb b/Roaming/bin/Debug/heroaming.pdb
index 3295e0d..44f13ad 100644
Binary files a/Roaming/bin/Debug/heroaming.pdb and b/Roaming/bin/Debug/heroaming.pdb differ
diff --git a/Roaming/obj/Debug/heroaming.dll b/Roaming/obj/Debug/heroaming.dll
index 3a2a999..f3eac2c 100644
Binary files a/Roaming/obj/Debug/heroaming.dll and b/Roaming/obj/Debug/heroaming.dll differ
diff --git a/Roaming/obj/Debug/heroaming.pdb b/Roaming/obj/Debug/heroaming.pdb
index 3295e0d..44f13ad 100644
Binary files a/Roaming/obj/Debug/heroaming.pdb and b/Roaming/obj/Debug/heroaming.pdb differ
diff --git a/Test_Roaming/Form1.cs b/Test_Roaming/Form1.cs
index af025b2..926b930 100644
--- a/Test_Roaming/Form1.cs
+++ b/Test_Roaming/Form1.cs
@@ -151,6 +151,7 @@ namespace Test_Roaming
                 roaming.DeleteMainKey(); //Hauptschlüssel löschen
 
                 labelResult.Text = "MainKey: " + mainKey + "\nSubKey: " + subKey + "\nKey: " + key + "\nValue: " + value + "\n\nSchreibe Key nach \'AppData\\Roaming\\'\nGelesener Wert: " + redvalue + "\nLösche Key/SubKey/MainKey";
+                labelResult.Text += "\n\nMainKey exist: " + roaming.MainKeyExists() + "\nSubKey exist: " + roaming.SubKeyExists() + "\nKey exist: " + roaming.KeyExists() + "\nValue ist null oder leer: " + roaming.ValueIsNullOrEmpty();
             }
             catch (Exception ex)
             {
diff --git a/Test_Roaming/bin/Debug/Test_Roaming.exe b/Test_Roaming/bin/Debug/Test_Roaming.exe
index 4497f17..1dd57dd 100644
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diff --git a/Test_Roaming/bin/Debug/Test_Roaming.pdb b/Test_Roaming/bin/Debug/Test_Roaming.pdb
index 66516f0..45b0235 100644
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diff --git a/Test_Roaming/bin/Debug/heroaming.dll b/Test_Roaming/bin/Debug/heroaming.dll
index bf0fef6..f3eac2c 100644
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diff --git a/Test_Roaming/bin/Debug/heroaming.pdb b/Test_Roaming/bin/Debug/heroaming.pdb
index d0fbd13..44f13ad 100644
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diff --git a/Test_Roaming/obj/Debug/Test_Roaming.csproj.AssemblyReference.cache b/Test_Roaming/obj/Debug/Test_Roaming.csproj.AssemblyReference.cache
index a479e99..b2c16dd 100644
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diff --git a/Test_Roaming/obj/Debug/Test_Roaming.exe b/Test_Roaming/obj/Debug/Test_Roaming.exe
index 4497f17..1dd57dd 100644
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diff --git a/Test_Roaming/obj/Debug/Test_Roaming.pdb b/Test_Roaming/obj/Debug/Test_Roaming.pdb
index 66516f0..45b0235 100644
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