How do I open a file that is opened in another application

Question

I have an winforms application that loads in excel files for analysis. Currently, in order to open the excel file the file must not be already open in excel otherwise a File

Answer 1

You could try passing FileShare.ReadWrite when opening the file:

using (var stream = new FileStream(
       @"d:\myfile.xls", 
       FileMode.Open, 
       FileAccess.Read, 
       FileShare.ReadWrite))
{

}