C A first chance exception of type System InvalidOperationException

Question

Working on a class assignment in C   I came across a program crash without any error  except what s written in VS2010 s debug window   Here is the typical code causing the crash    public partial class Test   Form       public Test                 InitializeComponent               private void Test Load object sender  EventArgs e                ColumnHeader header           header   new ColumnHeader            header Text                header TextAlign   HorizontalAlignment Center          header Width   30          listView1 Columns Add header            TimerCallback tcb   this UpdateListView           System Threading Timer updateTimer   new System Threading Timer tcb  null  0  1000              public void UpdateListView object obj                ListViewItem item          listView1 Items Clear             for  int i   0  i  lt  10  i                          item   new ListViewItem i ToString                  listView1 Items Add item                            what am I missing here      EDIT     There s no error  the program just ends like if I would call System Environment Exit 0    A first chance exception of type  System InvalidOperationException  occurred in System Windows Forms dll The program   4644  ProgramTest vshost exe  Managed  v4 0 30319   has exited with code 0  0x0   The program   4644  ProgramTest vshost exe  Program Trace  has exited with code 0  0x0

User · Accepted Answer

If you check Thrown for Common Language Runtime Exception in the break when an exception window  Ctrl Alt E in Visual Studio   then the execution should break while you are debugging when the exception is thrown    This will probably give you some insight into what is going on

User · Answer

The problem here is that your timer starts a thread and when it runs the callback function  the callback function   updatelistview  is accessing controls on UI thread so this can not be done becuase of this

User · Answer

Consider using System Windows Forms Timer instead of System Threading Timer for a GUI application  for timers that are based on the Windows message queue instead of on dedicated threads or the thread pool   In your scenario  for the purpose of periodic updates of UI  it seems particularly appropriate since you don t really have a background work or long calculation to perform  You just want to do periodic small tasks that have to happen on the UI thread anyway

[c#] C# : "A first chance exception of type 'System.InvalidOperationException'"

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