Wcf service not taking huge data(text)

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WCF

C#3.5

I have Client A and Client B. They communicate through WCF Service.

I am trying to send huge text(15000 characters), but WCF Service is not getting this data.

But when I send 8100 characters of text, WCF Service gets the data, and send to client B.

Please tell me how to solve this issue...

below is my Web.config:

<configuration>

  <appSettings>
    <add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" />
  </appSettings>
  <system.web>
    <compilation debug="true" targetFramework="4.5" />
    <httpRuntime targetFramework="4.5"/>
  </system.web>
  <system.serviceModel>
    <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>
      </serviceBehaviors>
    </behaviors>
    <services>
      <service name ="WcfService.Service1" >
        <endpoint address ="" binding ="wsDualHttpBinding" contract ="WcfServiceLibrary.IMyService"/>
         <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
        <host>
          <baseAddresses>
            <add baseAddress ="http://localhost/Service1.svc"/>
          </baseAddresses>
        </host>
      </service>
    </services>
    <protocolMapping>
        <add binding="basicHttpsBinding" scheme="https" />
    </protocolMapping>    
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
  </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>

</configuration>

CLient A code(Button click code where I am sending Data)

DataMessage message = new DataMessage();
                message.Age = "
                string Xml = _DataResult;
                message.Name = Xml.ToString();

Client B code(Where textbox gets the result from WCF Service)

this.label1.Text = eventData.Age;
            this.textBox1.Text = eventData.Name;

DataMember in WCF:

[DataMember]
        public string Name { get; set; }
[DataMember]
        public string Age { get; set; }

What I have tried:

Please suggest me how to solve this Issue