The remote server returned an error: (403) forbidden.

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C#

I have windows application in which accessing a rest api in it.while running the windows application i am getting the following error.

The remote server returned an error: (403) Forbidden.

Here is my code.

string URL = Convert.ToString(ConfigurationManager.AppSettings["GetDimensionsApi"]);
           try
           {
               var httpWebRequest = (HttpWebRequest)WebRequest.Create(URL);
               httpWebRequest.ContentType = "application/json";
               httpWebRequest.Method = "GET";
               httpWebRequest.ContentLength = 0;
               var result = "";
               var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
               using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
               {
                   result = streamReader.ReadToEnd();
                   var deserialized_json = JsonConvert.DeserializeObject(result);
                   var response = (dynamic)(deserialized_json);
                   var Dimensions_data = response.ListDimensions;

                   dt.Columns.Add("Sno");
                   dt.Columns.Add("Dimensions");
                   if (Dimensions_data.Count>0)
                   {
                       foreach (var items in Dimensions_data)
                       {
                           DataRow row = dt.NewRow();
                           row["Sno"] = Convert.ToInt32(items.id);
                           row["Dimensions"] = Convert.ToInt32(items.Width) + "*" + Convert.ToInt32(items.Height);
                           dt.Rows.Add(row);
                       }
                   }


               }
           }

Thanks in advance

What I have tried:

I have tried by giving read write permissions to webapi project in iis server.but still i am facing the issue