C# check if a directory exists

	string directory = @"C:\folder name";
  
	if (Directory.Exists(directory)
    {
    	// Directory exits!
    }

C# check if string is path or file

// get the file attributes for file or directory
FileAttributes attr = File.GetAttributes(@"c:\Temp");

//detect whether its a directory or file
if ((attr & FileAttributes.Directory) == FileAttributes.Directory)
    MessageBox.Show("Its a directory");
else
    MessageBox.Show("Its a file");

Source: stackoverflow.com

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