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This is my web service which i used to retrieve data from database (I used data set for it).It runs on IIS properly but when I upload it on web server it gives method error 500.
msil
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.Web.Script.Services.ScriptService]
public class ReceiptService : System.Web.Services.WebService
{
    public ReceiptService () {

        //Uncomment the following line if using designed components
        //InitializeComponent();
    }
    [WebMethod]
    public CascadingDropDownNameValue[] GetSchoolName(string knownCategoryValues, string category)
    {
        dsScoolTableAdapters.school_detailTableAdapter school_detailAdapter = new dsScoolTableAdapters.school_detailTableAdapter();
        dsScool.school_detailDataTable schools = school_detailAdapter.GetSchoolName();
        List<CascadingDropDownNameValue> values = new List<CascadingDropDownNameValue>();
        foreach (DataRow dr in schools)
        {
            string school_name = (string)dr["school_name"];
            string district = (string)dr["district"];
            values.Add(new CascadingDropDownNameValue(school_name, school_name.ToString()));
        }
        return values.ToArray();
    }


}
Posted
Updated 2-Aug-16 23:58pm

The 500 Internal Server Error is a "server-side" error, meaning the problem is not with your PC or Internet connection but instead is a problem with the web site's server.

Read about Error 500 here: HTTP Error 500 Internal server error[^]

Also this microsoft article: How Web site administrators can troubleshoot an "HTTP 500 - Internal Server Error"[^]
   
Comments
vineesha 25-May-11 8:36am
   
No I am not asking about HTTP Error 500 Internal server error, on my page method error 500 occurs if you had any solution for it then tell me. my page link is - http://vidyabhartimahakoshal.org/sspstore/Ghosh.aspx
In case anyone is as dumb as I apparently am for me the issue was that I left out
[System.Web.Script.Services.ScriptService]

in my web service declaration! D'oh! Hopefully this will save someone the time I spent trying to track down the issue.
   
In case this problem occurres with the large amount of data try change value in the parameter
maxJsonLength
in the web.config:
xml
<system.web.extensions>
        <scripting>
            <webServices>
                <jsonSerialization maxJsonLength="5000000" />
            </webServices>
        </scripting>
    </system.web.extensions>


this solution was found in http://forums.asp.net/t/1038620.aspx/2/10[^]
   
I get the solution of that error.In this i used dataset for data binding but on the web server it is not work perfectly then now i changed the code as
using System;
using System.Collections;
using System.Configuration;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml.Linq;
using AjaxControlToolkit;
using System.Data;
using System.Data.SqlClient;
/// <summary>
/// Summary description for ReceiptService
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.Web.Script.Services.ScriptService]
public class ReceiptService : System.Web.Services.WebService
{
string connStr = ConfigurationManager.ConnectionStrings["TutTestConn"].ToString();
public ReceiptService () {
//Uncomment the following line if using designed components
//InitializeComponent();
}
[WebMethod]
public CascadingDropDownNameValue[] GetSchoolName(string knownCategoryValues, string category)
{
//dsScoolTableAdapters.school_detailTableAdapter school_detailAdapter = new dsScoolTableAdapters.school_detailTableAdapter();
//dsScool.school_detailDataTable schools = school_detailAdapter.GetSchoolName();
SqlConnection conn = new SqlConnection(connStr);
conn.Open();
SqlCommand dCmd = new SqlCommand("LoadAllSchool", conn);
dCmd.CommandType = CommandType.StoredProcedure;
SqlDataReader rdr = null;
rdr = dCmd.ExecuteReader();
List<CascadingDropDownNameValue> values = new List<CascadingDropDownNameValue>();
while(rdr.Read())
{
string school_name = (string)rdr["school_name"];
string district = (string)rdr["district"];
values.Add(new CascadingDropDownNameValue(school_name, school_name.ToString()));
}
return values.ToArray();
}

}
   
I also got this kind of error and after done research on Internet, I found solution.

If the below line of code is commented, first remove the comment and then try to execute, it will work. If you will not find, then type it.

[System.Web.Script.Services.ScriptService()]

It should be like this in WebService

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.Web.Script.Services.ScriptService()]
public class CascadingDropDown : System.Web.Services.WebService {


It should fix the error
   
In case anyone is as dumb as I apparently am for me the issue was that I left out
[System.Web.Script.Services.ScriptService]

in my web service declaration! D'oh! Hopefully this will save someone the time I spent trying to track down the issue.
   
Comments
Devesh2179 20-Oct-13 5:29am
   
Thanks it works
Install this add-on on server

http://www.microsoft.com/en-us/download/details.aspx?id=883[^]
   
Comments
VICK 25-Jul-14 1:07am
   
What could be the logic to answer an already solved and 3 year old question???
XML
<system.web.extensions>
        <scripting>
            <webServices>
                <jsonSerialization maxJsonLength="5000000" />
            </webServices>
        </scripting>
    </system.web.extensions>
   

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