how to create session in asp.net using vb

Question

I have a gridview which shows the details of passenger who have booked their ticket on page load event i have following code.

Label1.Text = Session("Pid").ToString()
    Dim Sql As String = "select * from Plist where Pid='" & Label1.Text & "'"
    Try
        con.ConnectionString = strCon
        Dim cm As New SqlClient.SqlCommand(Sql, con)
        con.Open()
        cm.ExecuteNonQuery()
    Catch ex As Exception
        MsgBox(ex.Message)
    Finally
        If con.State = ConnectionState.Open Then
            con.Close()

        End If
    End Try

I am getting this error: System.NullReferenceException: Object reference not set to an instance of an object.

You should print your stack trace here as it will help to know exactly where the exception is being thrown from. — Gaurav Pandey
– Gaurav Pandey, Commented Feb 14, 2013 at 12:21

Alex · Accepted Answer · 2013-02-14 12:08:19Z

3

the session Session("Pid") is null, you should fill it with data before and you also should check the session:

If Session("Pid") IsNot Nothing Then
' write your code
End If

answered Feb 14, 2013 at 12:08

Alex

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Community · Accepted Answer · 2017-05-23 11:49:17Z

0

Check all your "SESSIONS" for null before using it...................

And Refer

and also IRequiresSessionState Interface

Specifies that the target HTTP handler requires read and write access to session-state values. This is a marker interface and has no methods.

edited May 23, 2017 at 11:49

CommunityBot

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answered Feb 14, 2013 at 12:25

andy

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