diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenProperty.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenProperty.java
index d3de34a29bae..6362fb93d80a 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenProperty.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenProperty.java
@@ -157,6 +157,7 @@ public class CodegenProperty implements Cloneable, IJsonSchemaValidationProperti
     public boolean isSelfReference;
     public boolean isCircularReference;
     public boolean isDiscriminator;
+    public boolean isNew; // true when this property overrides an inherited property
     public List<String> _enum;
     public Map<String, Object> allowableValues;
     // If 'additionalProperties' is not set, items is null.
@@ -1063,6 +1064,7 @@ public class CodegenProperty implements Cloneable, IJsonSchemaValidationProperti
         sb.append(", isSelfReference=").append(isSelfReference);
         sb.append(", isCircularReference=").append(isCircularReference);
         sb.append(", isDiscriminator=").append(isDiscriminator);
+        sb.append(", isNew=").append(isNew);
         sb.append(", _enum=").append(_enum);
         sb.append(", allowableValues=").append(allowableValues);
         sb.append(", items=").append(items);
@@ -1153,6 +1155,7 @@ public class CodegenProperty implements Cloneable, IJsonSchemaValidationProperti
                 isSelfReference == that.isSelfReference &&
                 isCircularReference == that.isCircularReference &&
                 isDiscriminator == that.isDiscriminator &&
+                isNew == that.isNew &&
                 hasValidation == that.hasValidation &&
                 isInherited == that.isInherited &&
                 isXmlAttribute == that.isXmlAttribute &&
@@ -1230,7 +1233,7 @@ public class CodegenProperty implements Cloneable, IJsonSchemaValidationProperti
                 isInteger, isLong, isNumber, isFloat, isDouble, isDecimal, isByteArray, isBinary, isFile,
                 isBoolean, isDate, isDateTime, isUuid, isUri, isEmail, isFreeFormObject,
                 isArray, isMap, isEnum, isInnerEnum, isEnumRef, isAnyType, isReadOnly, isWriteOnly, isNullable, isShort,
-                isUnboundedInteger, isSelfReference, isCircularReference, isDiscriminator, _enum,
+                isUnboundedInteger, isSelfReference, isCircularReference, isDiscriminator, isNew, _enum,
                 allowableValues, items, mostInnerItems, additionalProperties, vars, requiredVars,
                 vendorExtensions, hasValidation, isInherited, discriminatorValue, nameInCamelCase,
                 nameInSnakeCase, enumName, maxItems, minItems, isXmlAttribute, xmlPrefix, xmlName,
diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
index 5f79ee314bd1..7f9cb8c053ff 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
@@ -470,6 +470,35 @@ public class DefaultCodegen implements CodegenConfig {
     @Override
     @SuppressWarnings("static-method")
     public Map<String, ModelsMap> postProcessAllModels(Map<String, ModelsMap> objs) {
+        for (Map.Entry<String, ModelsMap> entry : objs.entrySet()) {
+            CodegenModel model = ModelUtils.getModelByName(entry.getKey(), objs);
+
+            for (CodegenProperty property : model.allVars){
+                property.isNew = codegenPropertyIsNew(model, property);
+            }
+            for (CodegenProperty property : model.vars){
+                property.isNew = codegenPropertyIsNew(model, property);
+            }
+            for (CodegenProperty property : model.readWriteVars){
+                property.isNew = codegenPropertyIsNew(model, property);
+            }
+            for (CodegenProperty property : model.optionalVars){
+                property.isNew = codegenPropertyIsNew(model, property);
+            }
+            for (CodegenProperty property : model.parentVars){
+                property.isNew = codegenPropertyIsNew(model, property);
+            }
+            for (CodegenProperty property : model.requiredVars){
+                property.isNew = codegenPropertyIsNew(model, property);
+            }
+            for (CodegenProperty property : model.readOnlyVars){
+                property.isNew = codegenPropertyIsNew(model, property);
+            }
+            for (CodegenProperty property : model.nonNullableVars){
+                property.isNew = codegenPropertyIsNew(model, property);
+            }
+        }
+
         if (this.useOneOfInterfaces) {
             // First, add newly created oneOf interfaces
             for (CodegenModel cm : addOneOfInterfaces) {
@@ -524,6 +553,12 @@ public class DefaultCodegen implements CodegenConfig {
         return objs;
     }
 
+    private boolean codegenPropertyIsNew(CodegenModel model, CodegenProperty property) {
+        return model.parentModel == null
+            ? false
+            : model.parentModel.allVars.stream().anyMatch(p -> p.name.equals(property.name) && (p.dataType.equals(property.dataType) == false || p.datatypeWithEnum.equals(property.datatypeWithEnum) == false));
+    }
+
     /**
      * Return a map from model name to Schema for efficient lookup.
      *
diff --git a/modules/openapi-generator/src/main/resources/csharp-netcore/libraries/generichost/ModelBaseSignature.mustache b/modules/openapi-generator/src/main/resources/csharp-netcore/libraries/generichost/ModelBaseSignature.mustache
index ddc5ecaead33..cded3cc164bf 100644
--- a/modules/openapi-generator/src/main/resources/csharp-netcore/libraries/generichost/ModelBaseSignature.mustache
+++ b/modules/openapi-generator/src/main/resources/csharp-netcore/libraries/generichost/ModelBaseSignature.mustache
@@ -1 +1 @@
-{{#parentModel.composedSchemas.allOf}}{{^isInherited}}{{#lambda.camelcase_param}}{{parent}}{{/lambda.camelcase_param}}.{{#lambda.titlecase}}{{baseType}}{{#isArray}}{{{dataFormat}}}{{/isArray}}{{/lambda.titlecase}}  {{/isInherited}}{{/parentModel.composedSchemas.allOf}}{{#parentModel.composedSchemas.anyOf}}{{#lambda.camelcase_param}}{{parent}}}{{/lambda.camelcase_param}}.{{#lambda.titlecase}}{{baseType}}{{#isArray}}{{{dataFormat}}}{{/isArray}}{{/lambda.titlecase}}  {{/parentModel.composedSchemas.anyOf}}{{#allVars}}{{#isInherited}}{{#lambda.camelcase_param}}{{name}}{{/lambda.camelcase_param}}  {{/isInherited}}{{/allVars}}
\ No newline at end of file
+{{#parentModel.composedSchemas.allOf}}{{^isInherited}}{{#lambda.camelcase_param}}{{parent}}{{/lambda.camelcase_param}}.{{#lambda.titlecase}}{{baseType}}{{#isArray}}{{{dataFormat}}}{{/isArray}}{{/lambda.titlecase}}  {{/isInherited}}{{/parentModel.composedSchemas.allOf}}{{#parentModel.composedSchemas.anyOf}}{{#lambda.camelcase_param}}{{parent}}{{/lambda.camelcase_param}}.{{#lambda.titlecase}}{{baseType}}{{#isArray}}{{{dataFormat}}}{{/isArray}}{{/lambda.titlecase}}  {{/parentModel.composedSchemas.anyOf}}{{#allVars}}{{#isInherited}}{{^isNew}}{{#lambda.camelcase_param}}{{name}}{{/lambda.camelcase_param}}{{/isNew}}{{#isNew}}{{#isEnum}}{{#isInnerEnum}}{{classname}}.{{/isInnerEnum}}{{{datatypeWithEnum}}}ToJsonValue({{#lambda.camelcase_param}}{{name}}{{/lambda.camelcase_param}}){{/isEnum}}{{^isEnum}}{{#lambda.camelcase_param}}{{name}}{{/lambda.camelcase_param}}.ToString(){{/isEnum}}{{/isNew}}  {{/isInherited}}{{/allVars}}
\ No newline at end of file
diff --git a/modules/openapi-generator/src/main/resources/csharp-netcore/libraries/generichost/modelGeneric.mustache b/modules/openapi-generator/src/main/resources/csharp-netcore/libraries/generichost/modelGeneric.mustache
index 1df0e038eb4c..04ec3e8581c4 100644
--- a/modules/openapi-generator/src/main/resources/csharp-netcore/libraries/generichost/modelGeneric.mustache
+++ b/modules/openapi-generator/src/main/resources/csharp-netcore/libraries/generichost/modelGeneric.mustache
@@ -125,7 +125,7 @@
         {{#deprecated}}
         [Obsolete]
         {{/deprecated}}
-        public {{>PropertyDataType}} {{name}} { get; {{^isReadOnly}}set; {{/isReadOnly}}}
+        public {{#isNew}}new {{/isNew}}{{>PropertyDataType}} {{name}} { get; {{^isReadOnly}}set; {{/isReadOnly}}}
 
         {{/isEnum}}
         {{/vars}}
@@ -165,8 +165,22 @@
         {{/isInherited}}
         {{/composedSchemas.allOf}}
         {{#allVars}}
-        {{^isInherited}}
         {{^isEnum}}
+        {{#isInherited}}
+        {{#isNew}}
+        /// <summary>
+        /// {{description}}{{^description}}Gets or Sets {{{name}}}{{/description}}
+        /// </summary>{{#description}}
+        /// <value>{{.}}</value>{{/description}}
+        [JsonPropertyName("{{baseName}}")]
+        {{#deprecated}}
+        [Obsolete]
+        {{/deprecated}}
+        public new {{#isNullable}}{{#lambda.optional}}{{{datatypeWithEnum}}}{{/lambda.optional}}{{/isNullable}}{{^isNullable}}{{{datatypeWithEnum}}}{{/isNullable}} {{name}} { get; {{^isReadOnly}}set; {{/isReadOnly}}}
+
+        {{/isNew}}
+        {{/isInherited}}
+        {{^isInherited}}
         /// <summary>
         /// {{description}}{{^description}}Gets or Sets {{{name}}}{{/description}}
         /// </summary>{{#description}}
@@ -177,8 +191,8 @@
         {{/deprecated}}
         public {{#isNullable}}{{#lambda.optional}}{{{datatypeWithEnum}}}{{/lambda.optional}}{{/isNullable}}{{^isNullable}}{{{datatypeWithEnum}}}{{/isNullable}} {{name}} { get; {{^isReadOnly}}set; {{/isReadOnly}}}
 
-        {{/isEnum}}
         {{/isInherited}}
+        {{/isEnum}}
         {{/allVars}}
         {{#isAdditionalPropertiesTrue}}
         {{^parentModel}}
diff --git a/samples/server/petstore/java-undertow/src/main/java/org/openapitools/handler/PathHandlerInterface.java b/samples/server/petstore/java-undertow/src/main/java/org/openapitools/handler/PathHandlerInterface.java
index 57217ef3e9a0..d135549db320 100644
--- a/samples/server/petstore/java-undertow/src/main/java/org/openapitools/handler/PathHandlerInterface.java
+++ b/samples/server/petstore/java-undertow/src/main/java/org/openapitools/handler/PathHandlerInterface.java
@@ -539,10 +539,10 @@ public interface PathHandlerInterface {
      * <p><b>Response headers</b>: [CodegenProperty{openApiType='integer', baseName='X-Rate-Limit', complexType='null', getter='getxRateLimit', setter='setxRateLimit', description='calls per hour allowed by the user', dataType='Integer', datatypeWithEnum='Integer', dataFormat='int32', name='xRateLimit', min='null', max='null', defaultValue='null', defaultValueWithParam=' = data.X-Rate-Limit;', baseType='Integer', containerType='null', title='null', unescapedDescription='calls per hour allowed by the user', maxLength=null, minLength=null, pattern='null', example='null', jsonSchema='{
   "type" : "integer",
   "format" : "int32"
-}', minimum='null', maximum='null', exclusiveMinimum=false, exclusiveMaximum=false, required=false, deprecated=false, hasMoreNonReadOnly=false, isPrimitiveType=true, isModel=false, isContainer=false, isString=false, isNumeric=true, isInteger=true, isShort=true, isLong=false, isUnboundedInteger=false, isNumber=false, isFloat=false, isDouble=false, isDecimal=false, isByteArray=false, isBinary=false, isFile=false, isBoolean=false, isDate=false, isDateTime=false, isUuid=false, isUri=false, isEmail=false, isFreeFormObject=false, isArray=false, isMap=false, isEnum=false, isInnerEnum=false, isEnumRef=false, isAnyType=false, isReadOnly=false, isWriteOnly=false, isNullable=false, isSelfReference=false, isCircularReference=false, isDiscriminator=false, _enum=null, allowableValues=null, items=null, additionalProperties=null, vars=[], requiredVars=[], mostInnerItems=null, vendorExtensions={}, hasValidation=false, isInherited=false, discriminatorValue='null', nameInCamelCase='XRateLimit', nameInSnakeCase='X_RATE_LIMIT', enumName='null', maxItems=null, minItems=null, maxProperties=null, minProperties=null, uniqueItems=false, uniqueItemsBoolean=null, multipleOf=null, isXmlAttribute=false, xmlPrefix='null', xmlName='null', xmlNamespace='null', isXmlWrapped=false, isNull=false, getAdditionalPropertiesIsAnyType=false, getHasVars=false, getHasRequired=false, getHasDiscriminatorWithNonEmptyMapping=false, composedSchemas=null, hasMultipleTypes=false, requiredVarsMap=null, ref=null, schemaIsFromAdditionalProperties=false, isBooleanSchemaTrue=false, isBooleanSchemaFalse=false, format=int32, dependentRequired=null, contains=null}, CodegenProperty{openApiType='string', baseName='X-Expires-After', complexType='Date', getter='getxExpiresAfter', setter='setxExpiresAfter', description='date in UTC when token expires', dataType='Date', datatypeWithEnum='Date', dataFormat='date-time', name='xExpiresAfter', min='null', max='null', defaultValue='null', defaultValueWithParam=' = data.X-Expires-After;', baseType='Date', containerType='null', title='null', unescapedDescription='date in UTC when token expires', maxLength=null, minLength=null, pattern='null', example='null', jsonSchema='{
+}', minimum='null', maximum='null', exclusiveMinimum=false, exclusiveMaximum=false, required=false, deprecated=false, hasMoreNonReadOnly=false, isPrimitiveType=true, isModel=false, isContainer=false, isString=false, isNumeric=true, isInteger=true, isShort=true, isLong=false, isUnboundedInteger=false, isNumber=false, isFloat=false, isDouble=false, isDecimal=false, isByteArray=false, isBinary=false, isFile=false, isBoolean=false, isDate=false, isDateTime=false, isUuid=false, isUri=false, isEmail=false, isFreeFormObject=false, isArray=false, isMap=false, isEnum=false, isInnerEnum=false, isEnumRef=false, isAnyType=false, isReadOnly=false, isWriteOnly=false, isNullable=false, isSelfReference=false, isCircularReference=false, isDiscriminator=false, isNew=false, _enum=null, allowableValues=null, items=null, additionalProperties=null, vars=[], requiredVars=[], mostInnerItems=null, vendorExtensions={}, hasValidation=false, isInherited=false, discriminatorValue='null', nameInCamelCase='XRateLimit', nameInSnakeCase='X_RATE_LIMIT', enumName='null', maxItems=null, minItems=null, maxProperties=null, minProperties=null, uniqueItems=false, uniqueItemsBoolean=null, multipleOf=null, isXmlAttribute=false, xmlPrefix='null', xmlName='null', xmlNamespace='null', isXmlWrapped=false, isNull=false, getAdditionalPropertiesIsAnyType=false, getHasVars=false, getHasRequired=false, getHasDiscriminatorWithNonEmptyMapping=false, composedSchemas=null, hasMultipleTypes=false, requiredVarsMap=null, ref=null, schemaIsFromAdditionalProperties=false, isBooleanSchemaTrue=false, isBooleanSchemaFalse=false, format=int32, dependentRequired=null, contains=null}, CodegenProperty{openApiType='string', baseName='X-Expires-After', complexType='Date', getter='getxExpiresAfter', setter='setxExpiresAfter', description='date in UTC when token expires', dataType='Date', datatypeWithEnum='Date', dataFormat='date-time', name='xExpiresAfter', min='null', max='null', defaultValue='null', defaultValueWithParam=' = data.X-Expires-After;', baseType='Date', containerType='null', title='null', unescapedDescription='date in UTC when token expires', maxLength=null, minLength=null, pattern='null', example='null', jsonSchema='{
   "type" : "string",
   "format" : "date-time"
-}', minimum='null', maximum='null', exclusiveMinimum=false, exclusiveMaximum=false, required=false, deprecated=false, hasMoreNonReadOnly=false, isPrimitiveType=false, isModel=false, isContainer=false, isString=false, isNumeric=false, isInteger=false, isShort=false, isLong=false, isUnboundedInteger=false, isNumber=false, isFloat=false, isDouble=false, isDecimal=false, isByteArray=false, isBinary=false, isFile=false, isBoolean=false, isDate=false, isDateTime=true, isUuid=false, isUri=false, isEmail=false, isFreeFormObject=false, isArray=false, isMap=false, isEnum=false, isInnerEnum=false, isEnumRef=false, isAnyType=false, isReadOnly=false, isWriteOnly=false, isNullable=false, isSelfReference=false, isCircularReference=false, isDiscriminator=false, _enum=null, allowableValues=null, items=null, additionalProperties=null, vars=[], requiredVars=[], mostInnerItems=null, vendorExtensions={}, hasValidation=false, isInherited=false, discriminatorValue='null', nameInCamelCase='XExpiresAfter', nameInSnakeCase='X_EXPIRES_AFTER', enumName='null', maxItems=null, minItems=null, maxProperties=null, minProperties=null, uniqueItems=false, uniqueItemsBoolean=null, multipleOf=null, isXmlAttribute=false, xmlPrefix='null', xmlName='null', xmlNamespace='null', isXmlWrapped=false, isNull=false, getAdditionalPropertiesIsAnyType=false, getHasVars=false, getHasRequired=false, getHasDiscriminatorWithNonEmptyMapping=false, composedSchemas=null, hasMultipleTypes=false, requiredVarsMap=null, ref=null, schemaIsFromAdditionalProperties=false, isBooleanSchemaTrue=false, isBooleanSchemaFalse=false, format=date-time, dependentRequired=null, contains=null}]</p>
+}', minimum='null', maximum='null', exclusiveMinimum=false, exclusiveMaximum=false, required=false, deprecated=false, hasMoreNonReadOnly=false, isPrimitiveType=false, isModel=false, isContainer=false, isString=false, isNumeric=false, isInteger=false, isShort=false, isLong=false, isUnboundedInteger=false, isNumber=false, isFloat=false, isDouble=false, isDecimal=false, isByteArray=false, isBinary=false, isFile=false, isBoolean=false, isDate=false, isDateTime=true, isUuid=false, isUri=false, isEmail=false, isFreeFormObject=false, isArray=false, isMap=false, isEnum=false, isInnerEnum=false, isEnumRef=false, isAnyType=false, isReadOnly=false, isWriteOnly=false, isNullable=false, isSelfReference=false, isCircularReference=false, isDiscriminator=false, isNew=false, _enum=null, allowableValues=null, items=null, additionalProperties=null, vars=[], requiredVars=[], mostInnerItems=null, vendorExtensions={}, hasValidation=false, isInherited=false, discriminatorValue='null', nameInCamelCase='XExpiresAfter', nameInSnakeCase='X_EXPIRES_AFTER', enumName='null', maxItems=null, minItems=null, maxProperties=null, minProperties=null, uniqueItems=false, uniqueItemsBoolean=null, multipleOf=null, isXmlAttribute=false, xmlPrefix='null', xmlName='null', xmlNamespace='null', isXmlWrapped=false, isNull=false, getAdditionalPropertiesIsAnyType=false, getHasVars=false, getHasRequired=false, getHasDiscriminatorWithNonEmptyMapping=false, composedSchemas=null, hasMultipleTypes=false, requiredVarsMap=null, ref=null, schemaIsFromAdditionalProperties=false, isBooleanSchemaTrue=false, isBooleanSchemaFalse=false, format=date-time, dependentRequired=null, contains=null}]</p>
      *
      * <p><b>Produces</b>: [{mediaType=application/xml}, {mediaType=application/json}]</p>
      * <p><b>Returns</b>: {@link String}</p>