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Where to put Try CAtch code for inserting a new record

Posted on 2008-10-21
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Last Modified: 2010-04-21
I have an unbound Formview that is used for adding a new Work Order against an equipment item. In the ItemInserting event I have code that generates the pk (WorkOrderID) for the table that the record is being inserted to. I want to put a Try_Catch there which would allow me to redirect the user if for some reason the sql server is down and a new WorkOrderID did not get generated. If succesful then I want to provide a message box that tells the user the new WorkOrderID and allows them to either go to another web page to further document the Work Order or add another Work Order.

 Where would be the best place to put the Try Catch function to make sure a new WorkOrderID was generated? I put it where I thought it might go but not too sure.

Which event would I use to  redirect the user once a new record was inserted and a WorkOrderID generated? ItemInserted perhaps?  
To redirect the user once the record is inserted I would need the WorkOrderID generated, how do I store that in a global variable after it is generated so I can then grab it later?

Thanks for any help





I have inserted what I have so far.
Protected Sub fvAddWorkOrder_ItemInserting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.FormViewInsertEventArgs) Handles fvAddWorkOrder.ItemInserting
        Dim newWorkOrderID As New NewWorkOrderID 'Class created to gerenrate next incramental WorkOrderID
        Dim txtDate As TextBox = DirectCast(fvAddWorkOrder.FindControl("txtDateOpened"), TextBox)
        Dim dateOpened As Date = txtDate.Text ' date needed to pass into the class to detrmine next woID
        Dim nextWorkOrderID As String = newWorkOrderID.NewWorkOrderID(dateOpened).ToString()
        Try
            e.Values("WorkOrderID") = nextWorkOrderID
        Catch ex As Exception
            MsgBox("There was a problem generating the Work Order. Contact System Administrator at 552-7604")
            Return
        End Try
 
    End Sub

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Question by:AkAlan
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Expert Comment

by:ladarling
ID: 22768348
Your newWorkOrderID() method is apparently generating the new number from the dateOpened object, so you should include that line in the Try block as well....
Try
Dim nextWorkOrderID As String = newWorkOrderID.NewWorkOrderID(dateOpened).ToString()
 e.Values("WorkOrderID") = nextWorkOrderID
Catch...
If that object has customer errors, you could identify it exactly by declaring ex to be a specific error type (Just as an example):
Catch ex As NewWorkOrderID_InvalidCastException
To catch my made-up exception type.
-------
On another note, VB.NET is *not* case sensitive. So, declaring a variable name identical to a class name is strongly discouraged, since you could run into all kinds of namespace qualification issues. So this line:
Dim newWorkOrderID As New NewWorkOrderID
Has the potential to give you problems down the road. Give it a number or someother unique value to keep your sanity trying to debug. For example:
 Dim newWorkOrderID1 As New NewWorkOrderID
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Accepted Solution

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ladarling earned 500 total points
ID: 22768437
Which event would I use to  redirect the user once a new record was inserted and a WorkOrderID generated? ItemInserted perhaps?  
You could do the redirect right after your Try statements:
e.Values("WorkOrderID") = nextWorkOrderID
...Since if that errors out, the statements following it will be ignored and Catch will take over execution.

To redirect the user once the record is inserted I would need the WorkOrderID generated, how do I store that in a global variable after it is generated so I can then grab it later?
Declare a global variable in VB just after the Partial Class.. statement of your master page, something like:
Dim currentWOID as String
And then assign your resulting new work order ID before the redirect in your Try..Catch, somtheing like:
currentWOID = nextWorkOrderID

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Author Comment

by:AkAlan
ID: 22768444
Thanks, both suggestions make tons of sence. Any thoughts on where to put the code for redirecting the user once the database has been updated with the new record. Item_Inserted? I don't know the ramifications of interupting the process of inserting.
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Author Comment

by:AkAlan
ID: 22768469
Thanks, I got your second responce just as I submitted my last post. I'll give all those a try. Thanks a bunch for your help.
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Author Closing Comment

by:AkAlan
ID: 31508335
Thanks again, I'm a newby coming from Access and this is different enough to give me a great challenge. People like you make it much easier.
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