First few days using VB.NET

In VB5 I used the following routine to put values into variables A,b,c,d

Open “C:\TextFiles\File.txt” For Input As #1
For I = 1 To 13
Input #1, A, b, c, d
If A = Text1.Text Then I = 5
Next I
Close #1

Where File.txt :-

1, 23,45,44
2,34,55,72
3,21,15,88
4,9,13,67
5,10,7,28

I can get the file information into VB.NET but cannot discover how to assign the variables.
"Input" only seems able to input single items.
Can anyone help?