Generate trace file to handle all types of exceptions

Step 1: catch your exceptions

catch (Exception ex)

{
   ErrorHandler e2 = new ErrorHandler();
   e2.HandleException(ex);
}

where ErrorHandler is a class name and HandleException is method name where pe pass this exception.

Step 2: Create a seperate class file for handling all types of exception and also for generating trace or   error log file.

public void HandleException(Exception exceptionName)

{
 string ExpName = Convert.ToString(exceptionName.GetType().FullName.Remove(0,7));
 switch (ExpName)
 {
      case "Data.SqlClient.SqlException":
        WriteError(exceptionName);
         System.Web.HttpContext.Current.Response.Redirect("ErrorPage.aspx");
      break;
      case "ArgumentException":
         WriteError(exceptionName);
         System.Web.HttpContext.Current.Response.Redirect("ErrorPage.aspx");
       break;
       case "FieldAccessException":
         WriteError(exceptionName);
         System.Web.HttpContext.Current.Response.Redirect("ErrorPage.aspx");
       break;

        // you can search aand so many exception here
     default:
       WriteError(exceptionName);
       System.Web.HttpContext.Current.Response.Redirect("ErrorPage.aspx");
      break;
    }
}

where WriteError is method name where we pass the exception obj and retrive all information through this method

Step 3:
write the definition of WriteError method 


private void WriteError(Exception errorMessage)

{
     string path = "~/Error/" + DateTime.Today.ToString("dd-mm-yy") + ".txt";
     if (!File.Exists(System.Web.HttpContext.Current.Server.MapPath(path)))
       {
           File.Create(System.Web.HttpContext.Current.Server.MapPath(path)).Close();
        }
     using (StreamWriter w = File.AppendText(System.Web.HttpContext.Current.Server.MapPath(path)))
     {
         w.WriteLine("\r\nLog Entry : ");
         string err = "Error in: " + System.Web.HttpContext.Current.Request.Url.ToString() + ". Error  Message:" + errorMessage.Message;
        string err1 = "Error Type:" + errorMessage.GetType();
        string err2 = "Error BaseException:" + errorMessage.GetBaseException();
        string err4 = "Error StackTrace:" + errorMessage.StackTrace;
        w.WriteLine("................");
        w.WriteLine(err);
        w.WriteLine("................");
        w.WriteLine(err1);
        w.WriteLine("................");
        w.WriteLine(err2);
        w.WriteLine("................");
        w.WriteLine(err4);
        w.WriteLine("__________________________");
        w.Flush();
        w.Close();
    }
}

and also add these namespace

using System.IO;

using System.Text;