Add columns in listview in c#.net

Question

listview column issue

Answer 1

Use ListView.Columns.Add()

Answer 2

The line

this._listAvailable = new leaf.Plugins.leafListView();

implies that your control is derived from ListView (in fact, we can't know that for sure, it could be a whole other class with a similar api).
This makes every answer you'll get speculative - it's possible your class behaved differently than a ListView (for example, it might change some methods or properties)

Answer 3

The problem is simple actually everything is coming.the reason why its not coming at runtime we are referring the old DLL not the new DLL ,,,then how should it come,,sorry to disturbing you guys