C# .NET - Exception Handling

It basically boils down to the point how good the exception details you need to show to the users..

If you wanted to show whole exception details you can have a seperate div and assign the value to that div in the page or you could customize the exception and show user friendly messages insetad of exact esceptions..

But, its always better to have a seperate error page f ro the site and show the error meesages in that by redirecting that error page..

You could check here for more info on custom error pages designing in asp.net for exception handling..

http://www.codeproject.com/KB/aspnet/ErrorHandlingASPNET.aspx

and

http://aspnetresources.com/articles/CustomErrorPages.aspx

try this code sample

  ExceptionLogger logger = new ExceptionLogger();
  logger.AddLogger(new WindowLogger());

Here's the implementation

using System.Windows.Forms;

namespace Utilities
{
  /// <summary>
  /// Logs errors to a window shown on screen
  /// </summary>
  public class WindowLogger : LoggerImplementation
  {
    /// <summary>
    /// Logs the specified error.
    /// </summary>
    /// <param name="error">The error to log.</param>
    public override void LogError(string error)
    {
      Form errorForm = new Form();
      if (Application.OpenForms.Count > 0)
      {
        errorForm.Width = Application.OpenForms[0].Width;
        errorForm.Height = Application.OpenForms[0].Height;
        errorForm.Left = Application.OpenForms[0].Left;
        errorForm.Top = Application.OpenForms[0].Top;
        errorForm.StartPosition = FormStartPosition.Manual;
        errorForm.TopLevel = true;
        errorForm.TopMost = true;
      }
      else
      {
        errorForm.Width = 600;
        errorForm.Height = 1000;
        errorForm.StartPosition = FormStartPosition.CenterScreen;
      }

      errorForm.Text = "An error has occured:";

      RichTextBox errorBox = new RichTextBox();
      errorForm.Controls.Add(errorBox);
      errorBox.Top = 10;
      errorBox.Left = 5;
      errorBox.Width = errorForm.Width - 20;
      errorBox.Height = errorForm.ClientRectangle.Height - 30 - errorBox.Top;
      errorBox.Text = error;
      errorBox.Font = new System.Drawing.Font("Courier New", 10);
      errorBox.ReadOnly = true;
      errorBox.WordWrap = false;
      errorBox.ScrollBars = RichTextBoxScrollBars.ForcedBoth;
      errorBox.Anchor = AnchorStyles.Bottom | AnchorStyles.Top | AnchorStyles.Left | AnchorStyles.Right;

      Button errorOk = new Button();
      errorForm.Controls.Add(errorOk);
      errorOk.Top = errorForm.ClientRectangle.Height - 25;
      errorOk.Left = errorForm.ClientRectangle.Width - 5 - errorOk.Width;
      errorOk.Text = "&OK";
      errorOk.DialogResult = DialogResult.Cancel;
      errorOk.Anchor = AnchorStyles.Right | AnchorStyles.Bottom;
      errorForm.CancelButton = errorOk;
      errorForm.AcceptButton = errorOk;

      errorForm.ShowDialog();
    }
  }
}

display error show image
-------------------
http://www.doogal.co.uk/images/ExceptionLogger.png

for exceptin handling you can use the above approaches,

for logging you can use Enterprise Library.

Thanks and Regards,
http://www.CodeCollege.NET
http://www.InterviewsGuru.info

You can use Customer Error pages once any error occurred in your code. In that you don’t have to worry about handling any error at all, you just need to make some changes in we.config which will take care of all things once any error occures.

You just need to desing one page which will show to user once any error occures.

<customErrors mode="On" defaultRedirect="~/frmErrorPage.aspx">

    <error statusCode="403" redirect="NoAccess.htm" />

    <error statusCode="404" redirect="FileNotFound.htm" />

</customErrors>

Once you add this tag in web.config it will take care of all errors.

See this link for same;

http://www.c-sharpcorner.com/UploadFile/akukreja/CustomErrorHandlingASPNET11142005235614PM/CustomErrorHandlingASPNET.aspx

But if you want to show exact exception to user then I think you need to do something different, like you can design one page and use TRY Catch to handle error, and once any error occurs you can handle it in Catch block. In that you can redirect to error page and pass your expection to that page. And you can display the details in that page as it is.

try

{

     //You code      

}

catch (Exception ex)

{

      //Take error in Session value;     

      Session["Error"] = ex.StackTrace + " " + ex.Message;

      Response.Redirect("frmErrorPage.aspx");

//So in that page you can acess Session value and display the error

}