How to send large string from server side to client side in ASP.NET web application

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I am trying to send large string more than 300k characters from server to client side.
for less character its works fine but if i send large data it gives me error at client side at GetVal()

ScriptResource.axd?d=ZcwVAK_NOhic4vV9c3pDrDgVOGeXTSmbV_h4hrB4AYvCck3CzugURz2Hh_coReQTH7g2Ic1Q-zr149y9DQxensyPFeoHX0_89UV7i63FJ5OMUYEZYqd0AqrTxEX33GzUL3THCXUISUSAdnLW_M1p5h7si3pju0-GYZycWvLFRcYN_zu_LztKZOOtUeyfUR-e0&t=3d0d00d7:6076 POST http://localhost:60125/...../GetVal 500 (Internal Server Error)

Please help me for this

What I have tried:

Java script:

JavaScript

PageMethods.GetVal(x, onRequestComplete, onError);

server side vb:

<System.Web.Services.WebMethod()> _
   Public Shared Function GetVal(ByVal x As String) As String
     Dim a As String
    //logic to get a value from db using x value
     Return a
   End Function

Posted 17-Oct-17 2:19am

Nitin Surya

Updated 17-Oct-17 7:37am

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Kornfeld Eliyahu Peter 17-Oct-17 8:46am

What error do you get?

Nitin Surya 17-Oct-17 8:51am

mentioned above
ScriptResource.axd?d=ZcwVAK_NOhic4vV9c3pDrDgVOGeXTSmbV_h4hrB4AYvCck3CzugURz2Hh_coReQTH7g2Ic1Q-zr149y9DQxensyPFeoHX0_89UV7i63FJ5OMUYEZYqd0AqrTxEX33GzUL3THCXUISUSAdnLW_M1p5h7si3pju0-GYZycWvLFRcYN_zu_LztKZOOtUeyfUR-e0&t=3d0d00d7:6076 POST http://localhost:60125/...../GetVal 500 (Internal Server Error)

Nitin Surya 17-Oct-17 8:53am

if i cut down the string then its works fine, but for big string gives me 500 internal server error

Kornfeld Eliyahu Peter 17-Oct-17 8:56am

Have you debugged the server side? Maybe there is a time-out that turns to be 500?

Nitin Surya 17-Oct-17 9:21am

i put msgbox just before return and string is ok in msgbox...that means there is no time out

ZurdoDev 17-Oct-17 10:47am

MsgBox does not work in web apps.

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Richard Deeming · Accepted Answer · 2017-10-17T05:36:00

You're probably exceeding the maximum response length:

How to: Configure ASP.NET Services in Microsoft Ajax | Configuring JSON Serialization[^]:
maxJsonLength Specifies the maximum length of the JSON string (the maximum number of UTF-8 characters). The default length is 102400.

Change the settings in your web.config file to increase the maximum:

XML

<configuration>
  <system.web.extensions>
    <scripting>
      <webServices>
        <jsonSerialization maxJsonLength="500000"/>
      </webServices>
    </scripting>
  </system.web.extensions>
</configuration>