Question

This is my class :

Public Class AddressForm

    Private Street As String

    Property Street_() As String
        Get
            Return Street
        End Get
        Set(ByVal value As String)
            If value IsNot Nothing Then
                Street = ""
            Else
                Street = value
            End If

        End Set
    End Property
End Class

it is my object for above class BussinessAddressDialog

If Not BussinessAddressDialog.Street_ = String.Empty (here application crashes for empty value)
after this line i am inserting values in data base

Thnx for your help

Answer 1

Try using ShortCircuit technique:

If BussinessAddressDialog IsNot Nothing AndAlso _
   BussinessAddressDialog.Street_ = String.Empty Then
    ' Do you work here
End If

Probably BussinessAddressDialog is not initialized has set to Nothing.