Object reference not set to an instance of an object

[lenniekuah]

Hi Good Guys,
I need your help. Please help me.
I encounter another surprising deadly problem.

I am trying to create a new ProductID and stored it in a variable intProdID and also to display it on the Label.

But I encounter this error message to my surprise:
Object reference not set to an instance of an object
this part of coding generate the error message:

Do While DR.Read
Me.lblProdID.Text = DR.Item("NewProdID") <-Error here
Loop



------------------------------------------
Here are the overall coding

Option Explicit On
 
Imports System.Data.SqlClient
Imports System.Data
Imports System.Drawing
Imports System
 
 'common variable
  Dim intProdId As Integer = 0
 
 Private Sub FrmProductMaintain_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) 
            Handles MyBase.Load 
 
        FGetNewProductID()
        intProdId = Me.lblProdID.Text  <---error as well 
 
 End Sub
 
-------------------------------------------------
  Private Sub FGetNewProductID()
    Dim strSql As String = "Select max(ProductID) + 1 as [NewProdID] from TBLProducts"
 
 try
  sqlconn = New SqlConnection(connstr)
  sqlconn.Open()
  sqlcmd = New SqlCommand(strSql)
  sqlcmd.Connection = sqlconn
 
  DR = sqlcmd.ExecuteReader
  Do While DR.Read
    Me.lblProdID.Text = DR.Item("NewProdID")<--Error here
  Loop
 
   DR.Close()
   sqlcmd.Dispose()
   sqlconn.Close()
 
  Catch ex As Exception
       MessageBox.Show(ex.Message)
  End Try
 
 End Sub
 
 

I am very surprise of this error.
Please help me.


Cheers,
Lennie

[jay123]

Hi lenniekuah,
Your top error can surely be sorted by changing to

 intProdId = CInt(Me.lblProdID.Text) 

as you are trying to allocate some Text value to an Integer.

i consider that your ProductId is Integer, you should use

Me.lblProdID.Text = CStr(DR.Item("NewProdID"))
 

out of interest, have you declared 'connstr' somewhere.. :)

[lenniekuah]

Hi Jay123,

You are wonderful. Thank you for helping me. Based on your instruction I checked my coding and Yes, I made a mistake. It's awesome I fixed it as per your instructions and now it's working.

Thank you very much for your help. You are awesome and wonderful in helping.

I am so glad to meet you here at this wonderful FORUM.


Cheers......Yaaa....Hoooo.......

Lennie