Asp Net Raise Error
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Asp Net Try Catch Throw
up How to raise exception in VB.NET? up vote 22 down vote favorite How should an exception be raised in VB.NET? vb.net exception share|improve this question edited Oct 31 '12 at 4:54 Joel Coehoorn 248k92440661 asked Oct 31 '12 at 4:34 CJ7 4,93332112218 2 @JonathonReinhart: I don't think there is anything wrong with having a definitive answer to a question like vb net throw exception example this on this site. –CJ7 Oct 31 '12 at 5:05 Sure. But it blows my mind that after the X years this site has been in existence no one has asked this question. As astander mentioned below, it's probably because it is so trivial and easily answered elsewhere. –Jonathon Reinhart Oct 31 '12 at 12:39 add a comment| 1 Answer 1 active oldest votes up vote 39 down vote accepted You would throw a new exception. Have a look at Throw Statement (Visual Basic) The Throw statement throws an exception that you can handle with structured exception-handling code (Try...Catch...Finally) or unstructured exception-handling code (On Error GoTo). You can use the Throw statement to trap errors within your code because Visual Basic moves up the call stack until it finds the appropriate exception-handling code. EDIT By request and from the link Throw New System.Exception("An exception has occurred.") share|improve this answer edited Oct 31 '12 at 4:48 answered Oct 31 '12 at 4:36 Adriaan Stander 107k11178220 @JonathonReinhart, understood. If this was a duplicate, then close it as such, if not it should be answered,
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How To Throw Exception In C#
Languages Mobile and Embedded Development .NET Development Office development Online Services Open Specifications patterns & practices Servers and Enterprise Development Speech Technologies Web Development Windows Desktop App Development TOC Collapse the http://stackoverflow.com/questions/13151322/how-to-raise-exception-in-vb-net table of content Expand the table of content This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. Complete Example for Error Handlers Other Versions Visual Studio 2010 .NET Framework 4 Visual Studio 2008 This code example includes elements for both page-level and application-level exception handling. Code Example Files The example consists of the following files: https://msdn.microsoft.com/en-us/library/bb397417.aspx Web.config Global.asax Default.aspx ExceptionUtility (to be put in the App_Code folder) GenericErrorPage.aspx HttpErrorPage.aspx Http404ErrorPage.aspx DefaultRedirectErrorPage.aspx Web.config The following example shows the Web.config file. The customErrors section specifies how to handle errors that occur with file types that are mapped to ASP.NET, such as .aspx, .asmx, and .ashx files. (In IIS 6.0 and in IIS 7.0 in classic mode, static content files such as .html and .jpg files are not mapped to ASP.NET.) The settings in the example customErrors section cause any unhandled HTTP 404 (file not found) errors to be directed to the Http404ErrorPage.aspx file. These HTTP 404 errors would occur if a request were made for an .aspx file, .asmx file, and so on and if the requested file did not exist. All other unhandled errors in ASP.NET files are directed to the DefaultRedirectErrorPage.aspx file. If static content files are not handled by ASP.NET, a request for a nonexistent .html or .jpg file does not cause a redirect to the Http404ErrorPage.aspx file. If you want ASP.NET to handle requests for all file types, you can configure IIS to map file-name extensions to ASP.NET. Note In the example, the mode
Comments. This tutorial will show you how to throw exceptions using ASP.NET 2.0 and C#.NET Throwing exceptions are easy to do in C# .NET. In this example we will be throwing exceptions when trying to create a directory in the filesystem, so we will need the System.IO namespace. Our code will catch two exceptions if the user tries to create a directory that is 248 characters long or tries to specify an invalid character within the directory name (such as the asterisk character). C# using System.IO; 012 using System.IO; We'll put our code in the btnSubmit_Click() event. When the btnSubmit_Click() event fires it runs a try block. The try block does two things: it lets exceptions thrown during the try block's execution to be caught by the catch block(s) below and ensures that execution can't leave the try block without running a finally block. In this example, we are specifying that our catch blocks handles exceptions of the type PathTooLongException and ArgumentException. We are also adding an if block that will throw an ArgumentException if there is a "\" character in the directory name. C# try { Directory.CreateDirectory(MapPath(".") + "\\" + txtDir.Text); // adding this line throws an ArgumentException even if the \ character is normally valid if (txtDir.Text.Contains("\\")) { throw new ArgumentException("Directory name cannot contain the \"\\\" character"); } } catch (PathTooLongException ex) { lblStatus.Text = "There was an PathTooLongException when creating the directory"; lblStatus.Text += " in " + MapPath(".") + "\\" + "\r"; } catch (ArgumentException ex) { lblStatus.Text = "There was a ArgumentException when creating the directory"; lblStatus.Text += " in " + MapPath(".") + "\\" + "\r"; lblStatus.Text += ex.Message + "\r"; } catch (Exception ex) { lblStatus.Text = ex.Message; } 012345678910111213141516171819202122232425 try{Directory.CreateDirectory(MapPath(".") + "\\" + txtDir.Text);// adding this line throws an ArgumentException even if the \ character is normally validif (txtDir.Text.Contains("\\")){throw new ArgumentException("Directory name cannot contain the \"\\\" character");}}catch (PathTooLongException ex){lblStatus.Text = "There was an PathTooLongException when creating the directory";lblStatus.Text += " in " + MapPath(".") + "\\" + "\r";}catch (ArgumentException ex){lblStatus.Text = "There was a ArgumentException when creating the directory";lblStatus.Text += " in " + MapPath(".") + "\\" + "\r";lblStatus.Text += ex.Message + "\r";}catch (Exception ex){lblStatus.Text = ex.Message;} We have one textbox,a Submit button, and a label on the front end for user interaction. The front end .aspx page looks some