reading error from table - vb.net- using OleDbDataReader

[questionit]

Hi

When i run the program, i get error on the statement inside Do While Loop. The piece of code from my application is:

Dim selectString As String
        selectString = "Select ContactName, Address from Customers"
 
        Dim cmd As OleDbCommand = New OleDbCommand(selectString, con)
        Dim reader As OleDbDataReader
 
        reader = cmd.ExecuteReader()
 
        Do While reader.Read() = True
            strName = reader("ContactName")
            strAddress = reader("Address")
        Loop

Object reference not set to an instance of an object

[tlhintoq]

Object reference not set to an instance of an object

You need to initialize all your variables to *something* before you use them.
If you look at your variables after the break, Visual Studio will show you which one(s) are null.