public EmployeeDepartment InsertEmployeeAndDepartment(params dynamic[] employee)
{
    filteredEmployees.EmployeeRecords = employee[0];
}

public EmployeeDepartment InsertEmployeeAndDepartment(params dynamic[] employee)
{
    var serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
    filteredEmployees.EmployeeRecords = serializer.Deserialize<List<EmployeeRecords >>(employee);
}

filteredEmployees.EmployeeRecords = employee;

filteredEmployees.EmployeeRecords = new [] { employee[0] };

FilterModel info = ((JArray)obj)[0].ToObject<FilterModel>();