The singe equals (=) should be correct for VB.NET. I think the double equals (==) would be an invalid syntax.

It is possible to set up debugging for ASP.NET and MM.NET comes with source code so anyone can step into the framework and see why its null.


>Hello Charles,
>
>I am not a VB expert by any stretch of the imagination, but I was curious about the return statement in the CheckRulesHook... In VB is "=" used for both assignment and a logical comparitor?
>
>Return Me.ErrorProviderBrokenRuleCount = 0
>
>or should this be:
>
>Return Me.ErrorProviderBrokenRuleCount == 0
>
>
>I know this is probably not going to fix your problem, but I was curious about the VB syntax.
>
>
>Thanks,
>
>Gordon
>
>
>
>>After working through the Quick Start Tutorial I decided to create a simple maintenance form that creates, reads, updates and deletes a list of states. I used the technique for editing data with a databound grid (with Update/Delete/Edit) buttons embedded.
>>
>>The editing of existing data works great. When the code at the top of the ASPX form reads as follows
>>
>>

>>Private Sub Page_Load()
>>    Session("dsStates") = Me.oStates.GetAllStates()
>>End Sub
>>

>>
>>As soon as the code is changed to take into account a postback situation as below:
>>
>>

>>If Not IsPostBack Then
>>      Session("dsStates") = Me.oStates.GetAllStates()
>>Else
>>      Dim dsStates As DataSet = CType(Session("dsStates"), DataSet)
>>      Me.oStates.SetCurrentDataSet(dsStates)
>>End If
>>

>>
>>The check rules code
>>

>>
>>Public Overrides Function CheckRulesHook() As Boolean
>>        Me.ValidateStateName(Me.DataRow("cName"))
>>        Me.ValidateStateAbbreviation(Me.DataRow("cAbbreviation"))
>>        Return Me.ErrorProviderBrokenRuleCount = 0
>>End Function
>>

>>
>>throws the following exception
>>
>>

>>Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
>>
>>Source Error:
>>
>>Line 27:
>>Line 28:     Public Overrides Function CheckRulesHook(ByVal ds As DataSet, ByVal tableName As String) As Boolean
>>Line 29:         Me.ValidateStateName(Me.DataRow("cName"))
>>Line 30:         Me.ValidateStateAbbreviation(Me.DataRow("cAbbreviation"))
>>Line 31:
>>

>>
>>Anyone have a clue as to how the Rules Object is losing a reference to Me.DataRow() during the process of a SetCurrentDataSet() operation?
>>
>>Thanks
>>
>>CT