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Object reference not set to an instance of an object.

Posted on 2007-04-01
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Last Modified: 2013-11-07
Public Class Form1
    Dim WithEvents Monitor As Timer
    Dim Drives As Dictionary(Of Integer,  System.IO.DriveInfo)

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        For Letters As Int16 = 65 To 90
            Dim mDrives As System.IO.DriveInfo = New System.IO.DriveInfo(Chr(Letters))
            Drives.Add(Letters, mDrives) '--> Getting the error here.
        Next
        Monitor.Start()
    End Sub
end class
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Question by:JackOfPH
2 Comments
 
LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 500 total points
ID: 18834396
You did not initializae the Drives variable, only declared it.

Public Class Form1
    Dim WithEvents Monitor As Timer
    Dim Drives As Dictionary(Of Integer,  System.IO.DriveInfo)

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Drives = new Dictionary(Of Integer,  System.IO.DriveInfo)

        For Letters As Int16 = 65 To 90
            Dim mDrives As System.IO.DriveInfo = New System.IO.DriveInfo(Chr(Letters))
            Drives.Add(Letters, mDrives) '--> Getting the error here.
        Next
        Monitor.Start()
    End Sub
0
 
LVL 15

Author Comment

by:JackOfPH
ID: 18834431
ANgel,

HAHAHA!!!

Silly me!!!

Beginners mistake!!!

Jack
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