Struct property not available

Question

I have a struct with five properties, which are set on button _click method (using Windows Forms Designer). After setting these, the bacground worker is run, using .RunWorkerAsync . The struct is then used inside the _DoWork method of the background worker.

However, when I call the struct inside the _ DoWork method, the properties of the struct all has the value null. Can anyone tell me what I am doing wrong? I am kind of new to C#.

Defining the struct

struct 
FtpSetting
{
  public String Server { get; set; }
  public String Username { get; set; }
  public String Password { get; set; }
  public String FileName { get; set; }
  public String FullName { get; set; }
}
FtpSetting _inputParameter;

Button click function (only relevant code)

FileInfo fi = new FileInfo(ofd.FileName);
_inputParameter.Server = txtServer.Text;
_inputParameter.Username = txtServer.Text;
_inputParameter.Password = txtServer.Text;
_inputParameter.FileName = fi.Name;
_inputParameter.FullName = fi.FullName;
backgroundWorker.RunWorkerAsync();

DoWork function (only relevant code)

string filename = ((FtpSetting)e.Argument).FileName; // Code crashes here
string fullname = ((FtpSetting)e.Argument).FullName; // ...But all the below values
string username = ((FtpSetting)e.Argument).Username; // ...Are null as well :-(
string password = ((FtpSetting)e.Argument).Password;
string server = ((FtpSetting)e.Argument).Server;

Answer 1

What is null here are not the struct 's properties but the Argument all together.

You need to call the overload of RunWorkerAsync(object argument) that takes the argument:

backgroundWorker.RunWorkerAsync(_inputParameter);