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web api client getting the Remote server returned an error:500

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I have completed my code my its giving me The remote server returned an error: (500) Internal Server Error. I been trying with Get and Post method but not luck, can anyone help me to view what I could doing wrong? Here you have my code, as you can see in comments I have tried several thing but nothing work This is an important project for me and I been looking everywhere and I have no luck.

Thanks

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  1. using System;
  2. using System.Collections.Generic;
  3. using System.ComponentModel;
  4. using System.Data;
  5. using System.Drawing;
  6. using System.Linq;
  7. using System.Text;
  8. using System.Windows.Forms;
  9. using System.Net.Http;
  10. using System.Threading.Tasks;
  11. using System.IO;
  12. using System.Web;
  13. using System.Net;
  14.  
  15.  
  16.  
  17. namespace DisplayDataInformation
  18. {
  19.     public partial class DisplayDataInformation : Form
  20.     {
  21.         public DisplayDataInformation()
  22.         {
  23.             InitializeComponent();
  24.  
  25.         }
  26.  
  27.         private void Submit(object sender, EventArgs e)
  28.         {
  29.             localhost.Dashboard proxy = new localhost.Dashboard();
  30.             localhost.MetaData[] pm = proxy.GetAllMetaData();
  31.             //const string MyProgramURL = "http://localhost/MyProgramm/";
  32.             const string apiKey = "MyKey123";
  33.             const string ProgramId = "user1";
  34.             const string ProgramPass = "123456";
  35.  
  36.  
  37.             HttpWebRequest myHttpWReq;
  38.             HttpWebResponse myHttpWResp;
  39.  
  40.            // myHttpWReq.ContentType
  41.  
  42.             // Make a web request to the web service
  43.             myHttpWReq = (HttpWebRequest)System.Net.WebRequest.Create("http://localhost/MyProgram/Dashboard.asmx/GetAllMetaData" + apiKey + ProgramId + ProgramPass);
  44.  
  45.             myHttpWReq.Method = "Post";
  46.             //myHttpWReq.Method = "Get";
  47.  
  48.             myHttpWReq.ContentLength = 0;
  49.  
  50.             // Get the response of the web service
  51.             myHttpWResp = (HttpWebResponse)myHttpWReq.GetResponse();
  52.  
  53.             if (myHttpWResp.StatusCode == HttpStatusCode.OK)
  54.             {
  55.                 //Create an XML reader to parse the response
  56.                 System.Xml.XmlReader reader = System.Xml.XmlReader.Create(myHttpWResp.GetResponseStream());
  57.  
  58.             }
  59.  
  60.             //set an string output to the windows form
  61.             StringBuilder sb = new StringBuilder();
  62.  
  63.  
  64.             foreach (localhost.ProjectMetaData value in pm)
  65.             {
  66.                 sb.AppendLine(value.ProjectTitle + "    -    "
  67.                     + value.ProjectID + "    -    "
  68.                     + value.PublishStatus);
  69.  
  70.             }
  71.  
  72.             label1.Text = sb.ToString(); //some label on your form for output
  73.  
  74.         }
  75.  
  76.     }
  77. }

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