Question

Possible Duplicate:
How do I read from a StreamReader with a while loop in Visual Basic?

In C# I would loop a streamreader as shown below.

while ((line = reader.ReadLine()) != null)
{
    list.Add(line); // Add to list.
    Console.WriteLine(line); // Write to console.
}

What’s the Equivalent in VB.NET?

I tried

while ((line = reader.ReadLine()) IsNot Nothing)

But it is not working.

Answer 1

In C#, ((line = reader.ReadLine()) != null) is an assignment inside an expression. VB does not support that. Thus, you will have to split

• the assignment line = reader.ReadLine() and
• the comparison line != null (in VB: line IsNot Nothing)

There are many ways to do that. One has been presented by Prasanna in a parallel answer. This is the one I’d prefer, since you do not need to repeat the ReadLine call:

Do
    Dim line As String = reader.ReadLine()
    If line Is Nothing Then Exit Do
    Console.WriteLine(line)
Loop