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    <p><strong>Never</strong> do that. <strong>Never</strong> build JSON manually. <strong>Always</strong> use JSON serializers. Or in your case you don't even need to do that because the ASP.NET webmethod runtime will take care. All you have to do is focus on your business requirements and don't worry about plumbing.</p> <p>So for example start by defining a model that will represent your data:</p> <pre><code>public class Person { public string FirstName { get; set; } public string LastName { get; set; } } </code></pre> <p>and then have your web method return this model leaving all serialization concerns to the framework:</p> <pre><code>[WebMethod] public static Person GetPerson() { Person p = new Person(); p.FirstName = "Manas"; p.LastName = "Tunga"; return p; } </code></pre> <p>And now simply consume this method from the client:</p> <pre><code>$.ajax({ type: 'POST', url: 'simplePage.aspx/GetPerson', data: '{ }', contentType: 'application/json; charset=utf-8', success: function (data) { alert(data.d.FirstName); alert(data.d.LastName); } }); </code></pre> <p>No need to worry about JSON, string builders, ...</p> <p>And you could also pass complex arguments to your web method if you needed to:</p> <pre><code>public class Foo { public string Bar { get; set; } } </code></pre> <p>and then:</p> <pre><code>[WebMethod] public static Person GetPerson(Foo foo) { ... } </code></pre> <p>and finally:</p> <pre><code>$.ajax({ type: 'POST', url: 'simplePage.aspx/GetPerson', data: JSON.stringify({ foo: { bar: 'baz' } }), contentType: 'application/json; charset=utf-8', success: function (data) { alert(data.d.FirstName); alert(data.d.LastName); } }); </code></pre> <p>The <code>JSON.stringify</code> method shown here is natively built into modern browsers. If you need to support legacy browsers you could include the <a href="https://github.com/douglascrockford/JSON-js" rel="noreferrer">json2.js</a> script to your page.</p>
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    1. POHow to make simple JSON object using C# string Builder
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    1. COIf i insist you to use string builder to manually create JSON then how would you do it. I wana know where was my mistake
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    2. COYou cannot insist on something as wrong as manually building JSON using strings. What is wrong is the approach that you have taken. The thing is that you are returning a string from your web method. So inside your success handler you need to parse this string back to an object if you want to access it, like this `alert($.parseJSON(data.d).firstname);`. But please, oh please promise me you will never do anything like that.
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