I have a method when I debug it it return 300000 rows fine but after getting data in list i am return json object and when I am testing it on post man I am getting this error "error during serialization or deserialization using the json javascriptserializer,the length of the string exceeds the value set on the maxjsonlength property, I have done the web .config changes as well n
<system.web.extensions> <scripting> <webServices> <jsonSerialization maxJsonLenght="5000000"/>
but still i am getting same error either it is mapping issue or length issue how to find