array length unknown? adding more to an array? [resolved]

[joeframbach]

i dont know how to do things with arrays, please help me

im using this code:

Dim sr As StreamReader = File.OpenText("users.txt")
Dim users()() As String

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim i As Integer = 0
Dim x As Integer = 0
Do While sr.Read
users(x)(0) = sr.ReadLine
users(x)(1) = sr.ReadLine
x += 1
Loop
sr.Close()
End Sub
Dim sr As StreamReader = File.OpenText("users.txt")
Dim users()() As String

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim i As Integer = 0
Dim x As Integer = 0
Do While sr.Read
users(x)(0) = sr.ReadLine
users(x)(1) = sr.ReadLine
x += 1
Loop
sr.Close()
End Sub

im getting this error:

An unhandled exception of type 'System.NullReferenceException' occurred in first.exe

Additional information: Object reference not set to an instance of an object.

can someone plz help me?