Test.js is a file, it contain:

Hello
Hello
Hello
Hello
Hello

This is my code:

I want to read the line then add the 4 "Hello" in my checkedlistbox items whenever the application start.
So, i do a for loop to read the line then add into my checkedlistbox items.

StreamReader readtheline = new StreamReader("C:\\Test2.js");

            //Read the first line of text
            for (int i = 1; i <= 100; i++)
            {
            string line2 = readtheline.ReadLine();
            checkedListBox1.Items.Add(line2);
            }

             readtheline.Close();
}

but when i want to compile it, it appear an error message :


An unhandled exception of type 'System.ArgumentNullException' occurred in system.windows.forms.dll

Additional information: Value cannot be null.

the line which highlighted green.

Thnks...

look at your test2.js file there must be more then 100 strings

Hey thanks.
sorrie to ask ...
got any idea how to check how many strings inside test2.js then do a for loop.

solve it .. thnku ..
using while loop instead of for loop..

while ((line2 = readtheline.ReadLine()) != null)
            {
                checkedListBox1.Items.Add(line2);

            }

Ye. But there is special properties @EndOfStream@:
            while (!readtheline.EndOfStream)
            {
                checkedListBox1.Items.Add(readtheline.ReadLine());
            }
Its more easy to understand such code)

woO~ thnks!