how to write json format in c#

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ASP.NET

this is my xml format
i want to write this in json format
please help me
private static byte[] GenerateXMLEmployee(string strFirstName,
string strLastName, int intEmpCode, string strDesignation)
{

XmlTextWriter xmlWriter = new XmlTextWriter(@"C:\Employee.xml", Encoding.UTF8);
XmlTextWriter xmlWriter = new XmlTextWriter(mStream, Encoding.UTF8);
xmlWriter.Formatting = Formatting.Indented;
xmlWriter.WriteStartDocument();
xmlWriter.WriteStartElement("Employee");
xmlWriter.WriteStartElement("FirstName");
xmlWriter.WriteString(strFirstName);
xmlWriter.WriteEndElement();
xmlWriter.WriteStartElement("LastName");
xmlWriter.WriteString(strLastName);
xmlWriter.WriteEndElement();
xmlWriter.WriteStartElement("EmpCode");
xmlWriter.WriteValue(intEmpCode);
xmlWriter.WriteEndElement();
xmlWriter.WriteStartElement("Designation");
xmlWriter.WriteString(strDesignation);
xmlWriter.WriteEndElement();
xmlWriter.WriteEndElement();
xmlWriter.WriteEndDocument();
xmlWriter.Flush();
xmlWriter.Close();
return mStream.ToArray();
}