I have DB in SQL server management studio. The Employee has first_name, last_name, and department. The code in c#:

        private FactoryDBEntities db = new FactoryDBEntities();

    public List<Employee> GetEmployees(string fname,string lname, int department)
    {
        if (fname == "" && lname == "" && department == 0)
        {
            return db.Employee.ToList();
        }
        else if(fname!=""&& lname == "" && department == 0)
        {
          
            return db.Employee.Where(x => x.First_Name == fname).ToList();
        }
        else if(fname == "" && lname != "" && department == 0)
        {
            return db.Employee.Where(x => x.Last_Name == lname).ToList();
        }
        else
        {
            return db.Employee.Where(x => x.DepartmentID == department).ToList();
        }
        
    }

now I want to send from javascript to search but I don't know how I can send this.

for example from postman I send: https://localhost:44341/api/Employee?fname=John and I received the data that I want. Thanks.