An exception of type System NullReferenceException occurred in myproject DLL but was not handled in user code

Question

What does this error mean   I keep getting this error  it use to work fine and it just started throwing this error     any help   img1 ImageUrl   ConfigurationManager AppSettings Get  Url   Replace        randomString      Server UrlEncode   System Web UI MobileControls Form Page FindControl  mobileForm    Title        An exception of type  System NullReferenceException  occurred in   MyProject DLL but was not handled in user code      Additional information  Object reference not set to an instance of an   object

User · Answer

It means you have a null reference somewhere in there  Can you debug the app and stop the debugger when it gets here and investigate  Probably img1 is null or ConfigurationManager AppSettings Get  Url   is returning null

User · Answer

It means somewhere in your chain of calls  you tried to access a Property or call a method on an object that was null   Given your statement   img1 ImageUrl   ConfigurationManager                      AppSettings                      Get  Url                        Replace        randomString                     Server UrlEncode                          System Web UI MobileControls Form Page                        FindControl  mobileForm                           Title     I m guessing either the call to AppSettings Get  Url   is returning null because the value isn t found or the call to Page FindControl  mobileForm   is returning null because the control isn t found   You could easily break this out into multiple statements to solve the problem   var configUrl   ConfigurationManager AppSettings Get  Url    var mobileFormControl   Page FindControl  mobileForm                               as System Web UI MobileControls Form   if configUrl    null  amp  amp  mobileFormControl    null        img1 ImageUrl   configUrl Replace        randomString    mobileControl Title

[c#] An exception of type 'System.NullReferenceException' occurred in myproject.DLL but was not handled in user code

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