WCF postback size limitation

The maximum size is about 1MB. You need to modify web.config for this.

  <system.serviceModel>

    <serviceHostingEnvironment aspNetCompatibilityEnabled="true"/>

    <standardEndpoints>

      <webHttpEndpoint>

        

       

        <standardEndpoint name="" helpEnabled="true" automaticFormatSelectionEnabled="true" maxBufferSize="2147483647" maxBufferPoolSize="2147483647" maxReceivedMessageSize="2147483647">

          <readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647" maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" />

        </standardEndpoint>

      </webHttpEndpoint>

    </standardEndpoints>

  </system.serviceModel>