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Created attachment 488 [details]
VS2010 project folder for passwind demonstrating issue
from a form with
4 buttons and one spinner
a method is called with different date parameters (dependent on button or spinner selection
GetWind(ds) ds is the date time selection
this checks to see if a copy of the wx chart for this date time has already been downloaded and saved
if not it downloads a copy and saves it, otherwise it uses the saved version (caching by another name)
Works fine if one comments out the line saveBMP line 433 wxClass4.cs
(though I havent stress tested it) nevertheless using the debugger it seems to go through the code in GetWindmap() twice
this is where the error arises - when it reaches the savebmp it seems to think th e file is already open and throws a sharing violation (on the second pass)
It also seems to be downlodding the bitmap a second time which is no good
It looks like you aren't disposing or closing the FileStream you create in WXClass5.cs at line ~444. The easiest way to ensure things always get disposed is to use the using pattern:
using (var fs = new System.IO.FileStream (filename, FileMode.Create))
WXclass5.windmap.Compress (Bitmap.CompressFormat.Png, 85, fs);
This ensures the FileStream will be disposed as soon as it goes out of scope, even if an exception occurs.
As for GetWind being called twice, if you check the call stack of where it is called from, you will see that the first time it is called from the button.Click, and the second time it is called from sp1.ItemSelected, because your button calls sp1.SetSelection(nn).