[Solved] ASP.net Core Web API Error: 405 Method Not Allowed in postman

I have Get method like below

  [HttpGet]
  public IActionResult GetAllData()
  {
      var sorgu = "SELECT CODE,NAME,CITY FROM CUSTOMER";

      using (var db=new BulutContext())
      {
        var adap=new SqlDataAdapter(sorgu, db.Database.GetConnectionString());
        var dt = new DataTable();
        adap.Fill(dt);     
        

        List<Customers> model = new List<Customers>();
        model = (from DataRow dr in dt.Rows
        select new Customers
        {
            CODE = dr[0].ToString(),
            NAME = dr[1].ToString(),
            CITY = dr[2].ToString()
        }).ToList();

        return Ok(model);
    }

 also this line added in startup.cs

services.AddCors(c =>
{
    c.AddPolicy("AllowOrigin", options => options.AllowAnyOrigin());
});
	  
app.UseCors(options => options.AllowAnyOrigin());

when testing in postman its return error 405 Method Not Allowed.