How to correct parameter name item cannot be null

[MeonR]

Hello All:
I have a streamreader that reads a list of text files store
and puts them in a listbox, doing this thows a "Cannot be null value, parameter name item" exception. There seems to be no way to pass ReadLine to anything but a string what I need is an array, however this does'nt seem to work either
any ideas?
try
{
StreamReader sr = new StreamReader(cboContainer.Text); do
{
strFileName = sr.ReadLine(); this.lstFiles.Items.Add(strFileName);

} while(strFileName != "");

sr.Close();
}
catch(Exception ex)
{
MessageBox.Show("Error Loading " + ex.Message);
}

TIA
MeonR


"The beatings will continue until morale improves

 

[AndrewJMarshall]

MeonR,

I think your problem is the structure of your loop.

Here's what you coded:
do
{
try to read something
use what was read
}
while (I actually read something)

The ReadLine call will eventually return null which you then try to add to the listbox. That's the error.

You need to change your code to:
try to read something
while (I actually read something)
{
use what was read
try to read something
}

Good luck,
Andrew

 

[MeonR]

Hello Andrew:

Tried it and no joy, repeats the same exception no matter what
any ideas?

Thanks
MeonR

"The beatings will continue until morale improves

 

[MeonR]

Hello Andrew:

Pardon me for exceeding the bounds of common stupidity!

while((strFileName = sr.ReadLine()!=null))
{
//load listbox
}

Thanks
MeonR

"The beatings will continue until morale improves