Update samples

Author: etherealjoy

samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/ApiResponse.cs

@@ -73,7 +73,7 @@ public string ToJson()
         /// <returns>Boolean</returns>
         public override bool Equals(object obj)
         {
-            if (ReferenceEquals(null, obj)) return false;
+            if (obj is null) return false;
             if (ReferenceEquals(this, obj)) return true;
             return obj.GetType() == GetType() && Equals((ApiResponse)obj);
         }
@@ -85,7 +85,7 @@ public override bool Equals(object obj)
         /// <returns>Boolean</returns>
         public bool Equals(ApiResponse other)
         {
-            if (ReferenceEquals(null, other)) return false;
+            if (other is null) return false;
             if (ReferenceEquals(this, other)) return true;
 
             return 

samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/Category.cs

@@ -66,7 +66,7 @@ public string ToJson()
         /// <returns>Boolean</returns>
         public override bool Equals(object obj)
         {
-            if (ReferenceEquals(null, obj)) return false;
+            if (obj is null) return false;
             if (ReferenceEquals(this, obj)) return true;
             return obj.GetType() == GetType() && Equals((Category)obj);
         }
@@ -78,7 +78,7 @@ public override bool Equals(object obj)
         /// <returns>Boolean</returns>
         public bool Equals(Category other)
         {
-            if (ReferenceEquals(null, other)) return false;
+            if (other is null) return false;
             if (ReferenceEquals(this, other)) return true;
 
             return 

samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/Order.cs

@@ -122,7 +122,7 @@ public string ToJson()
         /// <returns>Boolean</returns>
         public override bool Equals(object obj)
         {
-            if (ReferenceEquals(null, obj)) return false;
+            if (obj is null) return false;
             if (ReferenceEquals(this, obj)) return true;
             return obj.GetType() == GetType() && Equals((Order)obj);
         }
@@ -134,7 +134,7 @@ public override bool Equals(object obj)
         /// <returns>Boolean</returns>
         public bool Equals(Order other)
         {
-            if (ReferenceEquals(null, other)) return false;
+            if (other is null) return false;
             if (ReferenceEquals(this, other)) return true;
 
             return 

samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/Pet.cs

@@ -124,7 +124,7 @@ public string ToJson()
         /// <returns>Boolean</returns>
         public override bool Equals(object obj)
         {
-            if (ReferenceEquals(null, obj)) return false;
+            if (obj is null) return false;
             if (ReferenceEquals(this, obj)) return true;
             return obj.GetType() == GetType() && Equals((Pet)obj);
         }
@@ -136,7 +136,7 @@ public override bool Equals(object obj)
         /// <returns>Boolean</returns>
         public bool Equals(Pet other)
         {
-            if (ReferenceEquals(null, other)) return false;
+            if (other is null) return false;
             if (ReferenceEquals(this, other)) return true;
 
             return 

samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/Tag.cs

@@ -66,7 +66,7 @@ public string ToJson()
         /// <returns>Boolean</returns>
         public override bool Equals(object obj)
         {
-            if (ReferenceEquals(null, obj)) return false;
+            if (obj is null) return false;
             if (ReferenceEquals(this, obj)) return true;
             return obj.GetType() == GetType() && Equals((Tag)obj);
         }
@@ -78,7 +78,7 @@ public override bool Equals(object obj)
         /// <returns>Boolean</returns>
         public bool Equals(Tag other)
         {
-            if (ReferenceEquals(null, other)) return false;
+            if (other is null) return false;
             if (ReferenceEquals(this, other)) return true;
 
             return 

samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/User.cs

@@ -109,7 +109,7 @@ public string ToJson()
         /// <returns>Boolean</returns>
         public override bool Equals(object obj)
         {
-            if (ReferenceEquals(null, obj)) return false;
+            if (obj is null) return false;
             if (ReferenceEquals(this, obj)) return true;
             return obj.GetType() == GetType() && Equals((User)obj);
         }
@@ -121,7 +121,7 @@ public override bool Equals(object obj)
         /// <returns>Boolean</returns>
         public bool Equals(User other)
         {
-            if (ReferenceEquals(null, other)) return false;
+            if (other is null) return false;
             if (ReferenceEquals(this, other)) return true;
 
             return