System.NullReferenceException was unhandled.

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SQL-Server-2005

hi ,, i have made an instance PersId that gets i numeric value(Ex: 1)
and this is my code:

VB

Dim dr3 As SqlDataReader
        dr3 = Personne.SelectPersId()
        If dr3.Read Then
            Dim PersId As Integer = dr3.GetValue(0)
           
            Me.A2BindingSource.Filter = "Client =" & PersId
            dr3.Close()
        End If

Why it gives me this error and PersId(the instance) is = 1 for example??

-->Object reference not set to an instance of an object

Posted 5-Sep-13 23:15pm

husseinmog

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OriginalGriff · Answer 1 · 2013-09-05T23:21:00

Solution 1

It depends exactly where the error occurs: which line it is happening on.

But the most likely problem is that me.A2BindingSource is null (or Nothing) rather than PersId.

Check it in the debugger, but since the reader has read a row, it is unlikely to the the first element that does not exist - so the most likely source is the binding source not being set yet.

Posted 5-Sep-13 23:21pm

OriginalGriff

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[no name] 6-Sep-13 10:45am

yes, the error is in line of :
Me.A2BindingSource.Filter = "Client =" & PersId
but i'm sure that PersId has a value (1 or 2 for example)
how to fix it ??

OriginalGriff 6-Sep-13 11:03am

Read my solution: the bit where it says "Check it in the..."

indrajeet jadhav · Answer 2 · 2013-09-05T23:29:00

Solution 2

Check whats is PersId fields obtaining Null value ..means if you are executing application this PersId doent getting value ..and if its primary key field ..you know that primary key field value never have null value ..so plz chk code

Posted 5-Sep-13 23:29pm

indrajeet jadhav