diff --git a/xml/System.Web.Configuration/SessionStateSection.xml b/xml/System.Web.Configuration/SessionStateSection.xml
index ec7eaac5907..7dd39828a6c 100644
--- a/xml/System.Web.Configuration/SessionStateSection.xml
+++ b/xml/System.Web.Configuration/SessionStateSection.xml
@@ -112,7 +112,7 @@
       </AssemblyInfo>
       <Attributes>
         <Attribute>
-          <AttributeName>System.Configuration.ConfigurationProperty("allowCustomSqlDatabase", DefaultValue=Mono.Cecil.CustomAttributeArgument)</AttributeName>
+          <AttributeName>System.Configuration.ConfigurationProperty("allowCustomSqlDatabase", DefaultValue=false)</AttributeName>
         </Attribute>
       </Attributes>
       <ReturnValue>
@@ -149,7 +149,7 @@
       </AssemblyInfo>
       <Attributes>
         <Attribute FrameworkAlternate="netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8">
-          <AttributeName>System.Configuration.ConfigurationProperty("compressionEnabled", DefaultValue=Mono.Cecil.CustomAttributeArgument)</AttributeName>
+          <AttributeName>System.Configuration.ConfigurationProperty("compressionEnabled", DefaultValue=false)</AttributeName>
         </Attribute>
       </Attributes>
       <ReturnValue>
@@ -242,7 +242,7 @@
       </AssemblyInfo>
       <Attributes>
         <Attribute>
-          <AttributeName>System.Configuration.ConfigurationProperty("cookieName", DefaultValue=Mono.Cecil.CustomAttributeArgument)</AttributeName>
+          <AttributeName>System.Configuration.ConfigurationProperty("cookieName", DefaultValue="ASP.NET_SessionId")</AttributeName>
         </Attribute>
       </Attributes>
       <ReturnValue>
@@ -310,7 +310,7 @@
       </AssemblyInfo>
       <Attributes>
         <Attribute>
-          <AttributeName>System.Configuration.ConfigurationProperty("customProvider", DefaultValue=Mono.Cecil.CustomAttributeArgument)</AttributeName>
+          <AttributeName>System.Configuration.ConfigurationProperty("customProvider", DefaultValue="")</AttributeName>
         </Attribute>
       </Attributes>
       <ReturnValue>
@@ -381,7 +381,7 @@
       </AssemblyInfo>
       <Attributes>
         <Attribute>
-          <AttributeName>System.Configuration.ConfigurationProperty("mode", DefaultValue=Mono.Cecil.CustomAttributeArgument)</AttributeName>
+          <AttributeName>System.Configuration.ConfigurationProperty("mode", DefaultValue=SessionStateMode.InProc)</AttributeName>
         </Attribute>
       </Attributes>
       <ReturnValue>
@@ -423,7 +423,7 @@
       </AssemblyInfo>
       <Attributes>
         <Attribute>
-          <AttributeName>System.Configuration.ConfigurationProperty("partitionResolverType", DefaultValue=Mono.Cecil.CustomAttributeArgument)</AttributeName>
+          <AttributeName>System.Configuration.ConfigurationProperty("partitionResolverType", DefaultValue="")</AttributeName>
         </Attribute>
       </Attributes>
       <ReturnValue>
@@ -550,7 +550,7 @@
       </AssemblyInfo>
       <Attributes>
         <Attribute>
-          <AttributeName>System.Configuration.ConfigurationProperty("regenerateExpiredSessionId", DefaultValue=Mono.Cecil.CustomAttributeArgument)</AttributeName>
+          <AttributeName>System.Configuration.ConfigurationProperty("regenerateExpiredSessionId", DefaultValue=true)</AttributeName>
         </Attribute>
       </Attributes>
       <ReturnValue>
@@ -593,7 +593,7 @@
       </AssemblyInfo>
       <Attributes>
         <Attribute>
-          <AttributeName>System.Configuration.ConfigurationProperty("sessionIDManagerType", DefaultValue=Mono.Cecil.CustomAttributeArgument)</AttributeName>
+          <AttributeName>System.Configuration.ConfigurationProperty("sessionIDManagerType", DefaultValue="")</AttributeName>
         </Attribute>
       </Attributes>
       <ReturnValue>
@@ -630,7 +630,7 @@
           <AttributeName>System.ComponentModel.TypeConverter(typeof(System.Configuration.TimeSpanSecondsOrInfiniteConverter))</AttributeName>
         </Attribute>
         <Attribute>
-          <AttributeName>System.Configuration.ConfigurationProperty("sqlCommandTimeout", DefaultValue=Mono.Cecil.CustomAttributeArgument)</AttributeName>
+          <AttributeName>System.Configuration.ConfigurationProperty("sqlCommandTimeout", DefaultValue="00:00:30")</AttributeName>
         </Attribute>
       </Attributes>
       <ReturnValue>
@@ -669,7 +669,7 @@
           <AttributeName>System.ComponentModel.TypeConverter(typeof(System.Configuration.TimeSpanSecondsOrInfiniteConverter))</AttributeName>
         </Attribute>
         <Attribute FrameworkAlternate="netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8">
-          <AttributeName>System.Configuration.ConfigurationProperty("sqlConnectionRetryInterval", DefaultValue=Mono.Cecil.CustomAttributeArgument)</AttributeName>
+          <AttributeName>System.Configuration.ConfigurationProperty("sqlConnectionRetryInterval", DefaultValue="00:00:00")</AttributeName>
         </Attribute>
       </Attributes>
       <ReturnValue>
@@ -703,7 +703,7 @@
       </AssemblyInfo>
       <Attributes>
         <Attribute>
-          <AttributeName>System.Configuration.ConfigurationProperty("sqlConnectionString", DefaultValue=Mono.Cecil.CustomAttributeArgument)</AttributeName>
+          <AttributeName>System.Configuration.ConfigurationProperty("sqlConnectionString", DefaultValue="data source=localhost;Integrated Security=SSPI")</AttributeName>
         </Attribute>
       </Attributes>
       <ReturnValue>
@@ -748,7 +748,7 @@
       </AssemblyInfo>
       <Attributes>
         <Attribute>
-          <AttributeName>System.Configuration.ConfigurationProperty("stateConnectionString", DefaultValue=Mono.Cecil.CustomAttributeArgument)</AttributeName>
+          <AttributeName>System.Configuration.ConfigurationProperty("stateConnectionString", DefaultValue="data source=localhost;Integrated Security=SSPI")</AttributeName>
         </Attribute>
       </Attributes>
       <ReturnValue>
@@ -796,7 +796,7 @@
           <AttributeName>System.ComponentModel.TypeConverter(typeof(System.Configuration.TimeSpanSecondsOrInfiniteConverter))</AttributeName>
         </Attribute>
         <Attribute>
-          <AttributeName>System.Configuration.ConfigurationProperty("stateNetworkTimeout", DefaultValue=Mono.Cecil.CustomAttributeArgument)</AttributeName>
+          <AttributeName>System.Configuration.ConfigurationProperty("stateNetworkTimeout", DefaultValue="00:00:10")</AttributeName>
         </Attribute>
       </Attributes>
       <ReturnValue>
@@ -841,7 +841,7 @@
           <AttributeName>System.ComponentModel.TypeConverter(typeof(System.Configuration.TimeSpanMinutesOrInfiniteConverter))</AttributeName>
         </Attribute>
         <Attribute>
-          <AttributeName>System.Configuration.ConfigurationProperty("timeout", DefaultValue=Mono.Cecil.CustomAttributeArgument)</AttributeName>
+          <AttributeName>System.Configuration.ConfigurationProperty("timeout", DefaultValue="00:20:00")</AttributeName>
         </Attribute>
         <Attribute>
           <AttributeName>System.Configuration.TimeSpanValidator(MaxValueString="10675199.02:48:05.4775807", MinValueString="00:01:00")</AttributeName>
@@ -886,7 +886,7 @@
       </AssemblyInfo>
       <Attributes>
         <Attribute>
-          <AttributeName>System.Configuration.ConfigurationProperty("useHostingIdentity", DefaultValue=Mono.Cecil.CustomAttributeArgument)</AttributeName>
+          <AttributeName>System.Configuration.ConfigurationProperty("useHostingIdentity", DefaultValue=true)</AttributeName>
         </Attribute>
       </Attributes>
       <ReturnValue>