diff --git a/web/documentserver-example/csharp-mvc/Helpers/DocumentConverter.cs b/web/documentserver-example/csharp-mvc/Helpers/DocumentConverter.cs
index b5d4a83d..9a225a58 100644
--- a/web/documentserver-example/csharp-mvc/Helpers/DocumentConverter.cs
+++ b/web/documentserver-example/csharp-mvc/Helpers/DocumentConverter.cs
@@ -130,7 +130,7 @@ namespace OnlineEditorsExampleMVC.Helpers
                 var payloadToken = JwtManager.Encode(payload);  // encode the payload object to the payload token
                 var bodyToken = JwtManager.Encode(body);  // encode the body object to the body token
                 // create header token
-                string JWTheader = WebConfigurationManager.AppSettings["files.docservice.header"].Equals("") ? "Authorization" : WebConfigurationManager.AppSettings["files.docservice.header"];
+                string JWTheader = string.IsNullOrEmpty(WebConfigurationManager.AppSettings["files.docservice.header"]) ? "Authorization" : WebConfigurationManager.AppSettings["files.docservice.header"];
                 request.Headers.Add(JWTheader, "Bearer " + payloadToken);
 
                 body.Add("token", bodyToken);
diff --git a/web/documentserver-example/csharp-mvc/Helpers/TrackManager.cs b/web/documentserver-example/csharp-mvc/Helpers/TrackManager.cs
index 0e4c97fb..8e167190 100644
--- a/web/documentserver-example/csharp-mvc/Helpers/TrackManager.cs
+++ b/web/documentserver-example/csharp-mvc/Helpers/TrackManager.cs
@@ -55,7 +55,7 @@ namespace OnlineEditorsExampleMVC.Helpers
             // check if the document token is enabled
             if (JwtManager.Enabled)
             {
-                string JWTheader = WebConfigurationManager.AppSettings["files.docservice.header"].Equals("") ? "Authorization" : WebConfigurationManager.AppSettings["files.docservice.header"];
+                string JWTheader = string.IsNullOrEmpty(WebConfigurationManager.AppSettings["files.docservice.header"]) ? "Authorization" : WebConfigurationManager.AppSettings["files.docservice.header"];
 
                 string token = null;
 
@@ -92,7 +92,7 @@ namespace OnlineEditorsExampleMVC.Helpers
         // file saving process
         public static int processSave(Dictionary<string, object> fileData, string fileName, string userAddress)
         {
-            if (fileData["url"].Equals(null)) {
+            if (string.IsNullOrEmpty((string)fileData["url"])) {
                 throw new Exception("DownloadUrl is null");
             }
             var downloadUri = (string)fileData["url"];
@@ -169,7 +169,7 @@ namespace OnlineEditorsExampleMVC.Helpers
         // file force saving process
         public static int processForceSave(Dictionary<string, object> fileData, string fileName, string userAddress)
         {
-            if (fileData["url"].Equals(null)) {
+            if ( string.IsNullOrEmpty((string)fileData["url"])) {
                 throw new Exception("DownloadUrl is null");
             }
             var downloadUri = (string)fileData["url"];
@@ -228,7 +228,7 @@ namespace OnlineEditorsExampleMVC.Helpers
                     fileName = DocManagerHelper.GetCorrectName(Path.GetFileNameWithoutExtension(fileName) + downloadExt, userAddress);
                 }
                 forcesavePath = DocManagerHelper.ForcesavePath(fileName, userAddress, false);
-                if (forcesavePath.Equals(""))  // create forcesave path if it doesn't exist
+                if (string.IsNullOrEmpty(forcesavePath))  // create forcesave path if it doesn't exist
                 {
                     forcesavePath = DocManagerHelper.ForcesavePath(fileName, userAddress, true);
                 }
@@ -279,7 +279,7 @@ namespace OnlineEditorsExampleMVC.Helpers
 
                 var payloadToken = JwtManager.Encode(payload);  // encode a payload object into a header token
                 var bodyToken = JwtManager.Encode(body);  // encode body into a body token
-                string JWTheader = WebConfigurationManager.AppSettings["files.docservice.header"].Equals("") ? "Authorization" : WebConfigurationManager.AppSettings["files.docservice.header"];
+                string JWTheader = string.IsNullOrEmpty(WebConfigurationManager.AppSettings["files.docservice.header"]) ? "Authorization" : WebConfigurationManager.AppSettings["files.docservice.header"];
                 request.Headers.Add(JWTheader, "Bearer " + payloadToken);  // add a header Authorization with a header token and Authorization prefix in it
 
                 body.Add("token", bodyToken);
diff --git a/web/documentserver-example/csharp-mvc/WebEditor.ashx.cs b/web/documentserver-example/csharp-mvc/WebEditor.ashx.cs
index 794559c7..188faa18 100644
--- a/web/documentserver-example/csharp-mvc/WebEditor.ashx.cs
+++ b/web/documentserver-example/csharp-mvc/WebEditor.ashx.cs
@@ -463,13 +463,13 @@ namespace OnlineEditorsExampleMVC
 
                 if (JwtManager.Enabled && isEmbedded == null)
                 {
-                    string JWTheader = WebConfigurationManager.AppSettings["files.docservice.header"].Equals("") ? "Authorization" : WebConfigurationManager.AppSettings["files.docservice.header"];
+                    string JWTheader = string.IsNullOrEmpty(WebConfigurationManager.AppSettings["files.docservice.header"]) ? "Authorization" : WebConfigurationManager.AppSettings["files.docservice.header"];
 
                     if (context.Request.Headers.AllKeys.Contains(JWTheader, StringComparer.InvariantCultureIgnoreCase))
                     {
                         var headerToken = context.Request.Headers.Get(JWTheader).Substring("Bearer ".Length);
                         string token = JwtManager.Decode(headerToken);
-                        if (token == null || token.Equals(""))
+                        if (string.IsNullOrEmpty(token))
                         {
                             context.Response.StatusCode = (int)HttpStatusCode.Forbidden;
                             context.Response.Write("JWT validation failed");
@@ -479,7 +479,7 @@ namespace OnlineEditorsExampleMVC
                 }
 
                 var filePath = DocManagerHelper.ForcesavePath(fileName, userAddress, false);  // get the path to the force saved document version
-                if (filePath.Equals(""))
+                if (string.IsNullOrEmpty(filePath))
                 {
                     filePath = DocManagerHelper.StoragePath(fileName, userAddress);  // or to the original document
                 }
@@ -520,14 +520,14 @@ namespace OnlineEditorsExampleMVC
 
                 if (JwtManager.Enabled)
                 {
-                    string JWTheader = WebConfigurationManager.AppSettings["files.docservice.header"].Equals("") ? "Authorization" : WebConfigurationManager.AppSettings["files.docservice.header"];
+                    string JWTheader = string.IsNullOrEmpty(WebConfigurationManager.AppSettings["files.docservice.header"]) ? "Authorization" : WebConfigurationManager.AppSettings["files.docservice.header"];
 
                     if (context.Request.Headers.AllKeys.Contains(JWTheader, StringComparer.InvariantCultureIgnoreCase))
                     {
                         var headerToken = context.Request.Headers.Get(JWTheader).Substring("Bearer ".Length);
                         string token = JwtManager.Decode(headerToken);
 
-                        if (token == null || token.Equals(""))
+                        if (string.IsNullOrEmpty(token))
                         {
                             context.Response.StatusCode = (int)HttpStatusCode.Forbidden;
                             context.Response.Write("JWT validation failed");
diff --git a/web/documentserver-example/csharp/DocumentConverter.cs b/web/documentserver-example/csharp/DocumentConverter.cs
index 2cb0dd4e..1844c1b6 100644
--- a/web/documentserver-example/csharp/DocumentConverter.cs
+++ b/web/documentserver-example/csharp/DocumentConverter.cs
@@ -132,7 +132,7 @@ namespace ASC.Api.DocumentConverter
                 var payloadToken =  JwtManager.Encode(payload);  // encode the payload object to the payload token
                 var bodyToken = JwtManager.Encode(body);  // encode the body object to the body token
                 // create header token
-                string JWTheader = WebConfigurationManager.AppSettings["files.docservice.header"].Equals("") ? "Authorization" : WebConfigurationManager.AppSettings["files.docservice.header"];
+                string JWTheader = string.IsNullOrEmpty(WebConfigurationManager.AppSettings["files.docservice.header"]) ? "Authorization" : WebConfigurationManager.AppSettings["files.docservice.header"];
                 request.Headers.Add(JWTheader, "Bearer " + payloadToken);  // and add it to the request headers with the Bearer prefix
 
                 body.Add("token", bodyToken);
diff --git a/web/documentserver-example/csharp/TrackManager.cs b/web/documentserver-example/csharp/TrackManager.cs
index 145b60f9..69192d0a 100644
--- a/web/documentserver-example/csharp/TrackManager.cs
+++ b/web/documentserver-example/csharp/TrackManager.cs
@@ -57,7 +57,7 @@ namespace OnlineEditorsExample
             // check if the document token is enabled
             if (JwtManager.Enabled)
             {
-                string JWTheader = WebConfigurationManager.AppSettings["files.docservice.header"].Equals("") ? "Authorization" : WebConfigurationManager.AppSettings["files.docservice.header"];
+                string JWTheader = string.IsNullOrEmpty(WebConfigurationManager.AppSettings["files.docservice.header"]) ? "Authorization" : WebConfigurationManager.AppSettings["files.docservice.header"];
 
                 string token = null;
 
@@ -76,7 +76,7 @@ namespace OnlineEditorsExample
                     context.Response.Write("{\"error\":1,\"message\":\"JWT expected\"}");
                 }
 
-                if (token != null && !token.Equals(""))  // invalid signature error
+                if (!string.IsNullOrEmpty(token))  // invalid signature error
                 {
                     fileData = jss.Deserialize<Dictionary<string, object>>(token);
                     if (fileData.ContainsKey("payload"))
@@ -160,7 +160,7 @@ namespace OnlineEditorsExample
             File.WriteAllText(Path.Combine(versionDir, "key.txt"), (string)fileData["key"]);  // write the key value to the key.txt file
 
             string forcesavePath = _Default.ForcesavePath(newFileName, userAddress, false);  // get the path to the forcesaved file version
-            if (!forcesavePath.Equals(""))  // if the forcesaved file version exists
+            if (!string.IsNullOrEmpty(forcesavePath))  // if the forcesaved file version exists
             {
                 File.Delete(forcesavePath);  // remove it
             }
@@ -231,7 +231,7 @@ namespace OnlineEditorsExample
                 }
 
                 forcesavePath = _Default.ForcesavePath(fileName, userAddress, false);
-                if (forcesavePath.Equals(""))  // create forcesave path if it doesn't exist
+                if (string.IsNullOrEmpty(forcesavePath))  // create forcesave path if it doesn't exist
                 {
                     forcesavePath = _Default.ForcesavePath(fileName, userAddress, true);
                 }
@@ -282,7 +282,7 @@ namespace OnlineEditorsExample
 
                 var payloadToken = JwtManager.Encode(payload);  // encode a payload object into a header token
                 var bodyToken = JwtManager.Encode(body);  // encode body into a body token
-                string JWTheader = WebConfigurationManager.AppSettings["files.docservice.header"].Equals("") ? "Authorization" : WebConfigurationManager.AppSettings["files.docservice.header"];
+                string JWTheader = string.IsNullOrEmpty(WebConfigurationManager.AppSettings["files.docservice.header"]) ? "Authorization" : WebConfigurationManager.AppSettings["files.docservice.header"];
                 request.Headers.Add(JWTheader, "Bearer " + payloadToken);  // add a header Authorization with a header token and Authorization prefix in it
 
                 body.Add("token", bodyToken);
diff --git a/web/documentserver-example/csharp/WebEditor.ashx.cs b/web/documentserver-example/csharp/WebEditor.ashx.cs
index 50ba23bb..d24cf407 100644
--- a/web/documentserver-example/csharp/WebEditor.ashx.cs
+++ b/web/documentserver-example/csharp/WebEditor.ashx.cs
@@ -283,14 +283,14 @@ namespace OnlineEditorsExample
 
                 if (JwtManager.Enabled && isEmbedded == null)
                 {
-                    string JWTheader = WebConfigurationManager.AppSettings["files.docservice.header"].Equals("") ? "Authorization" : WebConfigurationManager.AppSettings["files.docservice.header"];
+                    string JWTheader = string.IsNullOrEmpty(WebConfigurationManager.AppSettings["files.docservice.header"]) ? "Authorization" : WebConfigurationManager.AppSettings["files.docservice.header"];
 
                     if (context.Request.Headers.AllKeys.Contains(JWTheader, StringComparer.InvariantCultureIgnoreCase))
                     {
                         var headerToken = context.Request.Headers.Get(JWTheader).Substring("Bearer ".Length);
                         string token = JwtManager.Decode(headerToken);
 
-                        if (token == null || token.Equals(""))
+                        if (string.IsNullOrEmpty(token))
                         {
                             context.Response.StatusCode = (int)HttpStatusCode.Forbidden;
                             context.Response.Write("JWT validation failed");
@@ -300,7 +300,7 @@ namespace OnlineEditorsExample
                 }
 
                 var filePath = _Default.ForcesavePath(fileName, userAddress, false);  // get the path to the force saved document version
-                if (filePath.Equals(""))
+                if (string.IsNullOrEmpty(filePath))
                 {
                     filePath = _Default.StoragePath(fileName, userAddress);  // or to the original document
                 }
@@ -340,14 +340,14 @@ namespace OnlineEditorsExample
 
                 if (JwtManager.Enabled)
                 {
-                    string JWTheader = WebConfigurationManager.AppSettings["files.docservice.header"].Equals("") ? "Authorization" : WebConfigurationManager.AppSettings["files.docservice.header"];
+                    string JWTheader = string.IsNullOrEmpty(WebConfigurationManager.AppSettings["files.docservice.header"]) ? "Authorization" : WebConfigurationManager.AppSettings["files.docservice.header"];
 
                     if (context.Request.Headers.AllKeys.Contains(JWTheader, StringComparer.InvariantCultureIgnoreCase))
                     {
                         var headerToken = context.Request.Headers.Get(JWTheader).Substring("Bearer ".Length);
                         string token = JwtManager.Decode(headerToken);
 
-                        if (token == null || token.Equals(""))
+                        if (string.IsNullOrEmpty(token))
                         {
                             context.Response.StatusCode = (int)HttpStatusCode.Forbidden;
                             context.Response.Write("JWT validation failed");