Eventhandler deletion?

Question

I'm programming with Visual Studio 2010 my code for a listview is. this.FolderBox.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] { this.Folders}); this.FolderBox.Location = new System.Drawing.Point(3 78); this.FolderBox.MultiSelect = false; this.FolderBox.Name = FolderBox; this.FolderBox.Size = new System.Drawing.Size(216 225); this.FolderBox.TabIndex = 7; this.FolderBox.UseCompatibleStateImageBehavior = false; this.FolderBox.View = System.Windows.Forms.View.Details; this.FolderBox.DoubleClick += FolderBox_DoubleClick; this.FolderBox.ItemSelectionChanged += FolderBox_ItemSelectionChanged; this.FolderBox.KeyDown += FolderBox_KeyDown; But everytime I run my program and stop it it reverts to. this.FolderBox.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] { this.Folders}); this.FolderBox.Location = new System.Drawing.Point(3 78); this.FolderBox.MultiSelect = false; this.FolderBox.Name = FolderBox; this.FolderBox.Size = new System.Drawing.Size(216 225); this.FolderBox.TabIndex = 7; this.FolderBox.UseCompatibleStateImageBehavior = false; this.FolderBox.View = System.Windows.Forms.View.Details; The last few lines are deleted and I can't figure out why. Anyone know why this happens? More importantly how do I stop it? I looked it up a bit and it seems to be a flaw with VS can anyone confirm?

Charles Morissette · Answer

I do have two different list boxes but that wasn't the issue. I forgot to type in += new EventHandler(*event handler code*); This was causing it to delete those lines every 2nd execution of my code from debug for whatever reason. I figured that out when I was trying to click/press enter and nothing was happening then I looked at the designer window and noticed 0 code. I added that and now it works fine.

Sam Hobbs · Answer

I am sorry but I do not understand. What are you looking at before and after executing the program? How do you know that the source code lines are being deleted? I don't understand how execution can modify the source code. My guess is that you have two instances of the object. That is just a guess but it is a common beginner mistake.

Muralidharan Deenathayalan · Answer

I couldn't reproduce this issue my machine. What you can do  try to install the latest service pack (VS 2010 SP1) from Microsoft and re-try once. http://msdn.microsoft.com/en-us/vstudio/aa718359 Do you have the same issue in other machines also? If so download the latest version of vs 2010 from Microsoft. Hope this helps you.