Adding a part to an order only once

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How can I limit the user to only adding each part only once so they will not be able to add it again? Here is the code that I have.

VB

Protected Sub btnAddPartToOrder_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click
        Dim o As Order
        o = Session("CurrentOrder")
        Dim p As New PartOrdered

        'does not allow the user to add a part to their order if the same part has already been ordered
        'If p Is Nothing Then
        p.PartNum = lstPart.SelectedValue
        p.Description = lstPart.SelectedItem.Text
        p.NumOrdered = txtQuantity.Text
        p.QuotedPrice = txtPrice.Text
        o.PartsOrdered.Add(p)

        'End If


        'Session("CurrentOrder") = o

        gvPartsOrdered.DataSource = o.PartsOrdered
        gvPartsOrdered.DataBind()

    End Sub

Posted 29-Apr-12 16:13pm

Member 8885701

Updated 29-Apr-12 19:10pm

Vipin_Arora

v3

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Lakamraju Raghuram 29-Apr-12 23:50pm

what is your question ?

1 solution

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Sandeep Mewara · Answer 1 · 2012-04-29T18:39:00

can I limit the user to only adding each part only once so they will not be able to add it again
Yes.

How
Maintain a list of users (userid or username whatever is unique and easy for you) that has already added their part to order.
Once a user adds his part to the order, add the user to that list. Maintain the list in an application variable as it looks like spanned across multiuser. In case it's based on one session then maintain it in a session.

For Application variable: MSDN: Application State[^]

Try!