This error message is mostly comes up,
when you try to access a file which is opened by another process.
You may open an image file in one of your form in a picturebox with using ImageFromFile or something.
I mostly use memorystream to open an image.
After read it in byte write it into a stream and close it.
You can check whether a file is being used or not with a simple function.
Try to open a file with none share.
public bool IsFileUsedbyAnotherProcess(string filename)This function will return true if
File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.None);
catch (System.IO.IOException exp)
the file because it is being used by another process or not.