How to get the json data in C# web service?

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C#

SQL-Server

webservice

JSON.NET

I'm using a web service in C# and SQL Server with a stored procedure. The web service code is in the XML format. I need to convert the code to JSON format for using in AngularJs. Or is there any possibility to return the web service data in JSON format?

What I have tried:

This is my Output

<NewDataSet> 
      <Table> 
        <iDept_category_id>6</iDept_category_id> 
        <cDept_category>qaz</cDept_category> 
        <dcreate_dt>01 Jan 2016</dcreate_dt> 
      </Table> 
      <Table> 
        <iDept_category_id>7</iDept_category_id> 
        <cDept_category>ICU</cDept_category> 
        <dcreate_dt>01 Dec 2016</dcreate_dt> 
      </Table> 
   </NewDataSet>

I need this output in

{"NewDataSet":
{"Table":[
{
"iDept_category_id":"6",
"cDept_category":"qaz",
"dcreate_dt":"01 Jan 2016"
},
{
"iDept_category_id":"7",
"cDept_category":"ICU",
"dcreate_dt":"01 Dec 2016"
}
]}
}