WCF HTTP Post returns 400

Hi All,

Im creating Wcf service and here is my IService function and config

 [OperationContract]
        [WebInvoke(Method = "POST", RequestFormat = WebMessageFormat.Xml,
            BodyStyle = WebMessageBodyStyle.Wrapped, ResponseFormat = WebMessageFormat.Xml,
            UriTemplate = "DoWork")]
        string DoWork(string name);

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://ift.tt/1eigFsq -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
  <appSettings>
    <add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" />
  </appSettings>
  <system.web>
    <compilation debug="true" targetFramework="4.5" />
    <httpRuntime targetFramework="4.5" />
  </system.web>
  <system.serviceModel>  
    <bindings>
      <webHttpBinding>
        <binding maxReceivedMessageSize="262144"></binding>
      </webHttpBinding>
    </bindings>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <!-- To avoid disclosing metadata information, set the values below to false before deployment -->
          <serviceMetadata httpGetEnabled="true" httpsGetEnabled="true" />
          <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
          <serviceDebug includeExceptionDetailInFaults="false" />
        </behavior>
          <behavior name="MetadataBehavior">
            <serviceMetadata httpGetEnabled="true" />
          </behavior>
      </serviceBehaviors>
      <endpointBehaviors>
        <behavior name="RestBehavior">
          <webHttp />
        </behavior>
      </endpointBehaviors>     
    </behaviors>    
    <protocolMapping>
      <add binding="webHttpBinding" scheme="https" />
    </protocolMapping>
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
    <services>
     
      <service behaviorConfiguration="MetadataBehavior" name="XXXXX.AdminOptions">
        <endpoint address="xxxxxx/AdminOptions.svc" binding="basicHttpBinding" bindingConfiguration="" name="Soap" contract="XXXX.IAdminOptions" />
        <endpoint behaviorConfiguration="RestBehavior" binding="webHttpBinding" bindingConfiguration="" name="webHttpBinding" contract="BigHartsService.IAdminOptions" />
      </service>
    </services>
  </system.serviceModel>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true" />
    <!--
        To browse web app root directory during debugging, set the value below to true.
        Set to false before deployment to avoid disclosing web app folder information.
      -->
    <directoryBrowse enabled="true" />
  </system.webServer>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="v11.0" />
      </parameters>
    </defaultConnectionFactory>
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
    </providers>
  </entityFramework>
 
<connectionStrings><add name="db" connectionString="metadata=http://res*/BigHartModel.csdl|res*/BigHartModel.ssdl|res*/BigHartModel.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=source;initial catalog=dbct;user id=XXXXX;password=XXXXX;MultipleActiveResultSets=True;App=EntityFramework&quot;" providerName="System.Data.EntityClient" /></connectionStrings></configuration>

Here is my client code

            var client = new HttpWebRequest();
            var postData = new List<KeyValuePair<string, string>>();
            postData.Add(new KeyValuePair<string, string>("name", "Saman"));

            HttpContent content = new FormUrlEncodedContent(postData);

            var response = await client.PostAsync("http://localhost:3395/AdminOptions.svc/DoWork", content);

i Tried clint side code with WebRequest also.. But eroor is status code returns 400..

whats wrong and how to fix