Binding currencyManager and dataRelation - datagridview - possible

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G

Guest

Hello,

Following an example at

http://www.vb-tips.com/dbpages.aspx?IA=DG (by Cor Lightert and Ken Tucker)

on binding a dataRelation to a Datagridview for sqlClient, I was able to
view rows in datagridview2 that corresponded to a selected row in
datagridview1. Great article/example.

Now I am navigating through the primary table using currencyManager and
displaying the data in textboxes rather than a datagridview. But I am still
using a datagridview for the secondary table. I bind the currencymanager to
the primary table, and I have a datarelation between the primary table and
the secondary table. But when I move to another row in the primary table
using the currencymanager, the datagridview is not displaying the
corresponding rows in the secondary table.

Is there a way I can navigate the primary table using currency manager and
display the corresponding rows of the secondary table in the datagridview
using the datarelation? I was previously using a dataview and the
dataview.Rowfilter for synchronizing the datagridview rows with the current
row in the primary table. This technique worked, but I believe the
datarelation method is better. Here is the code I am using for the
datarelation and currencty manager technique:

Priavate Sub Form1_Load(...)
....
Dim daPrimary As New SqlClient.SqlDataAdapter("Select * From PrimaryTbl",
conn)
Dim daSecondary As New SqlClient.SqlDataAdapter("Select * From
SecondaryTbl", conn)

daPrimary.Fill(ds, "Prinmary")
daSecondary.Fill(ds, "Secondary")

ds.Relations.Add("relPrimarySecondary", ds.Tables("Primary").Columns("ID"),
ds.Tables("Secondary").Columns("SubID"))
DataGridView1.DataSource = ds
DataGridView1.DataMember = "Primary.relPrimarySecondary"

curMgr = CType(Me.BindingContext(ds.Tables("Primary")), CurrencyManager)
curMgr.Position = 0

Me.txt0.DataBindings.Add("Text", ds.Tables("Primary"), "ID")
Me.txt1.DataBindings.Add("Text", ds.Tables("Primary"), "fName")
Me.txt2.DataBindings.Add("Text", ds.Tables("Primary"), "lName")
End Sub

Private Sub btn1_Click(...)
curMgr.Position += 1
End Sub

The currencymanager will iterate through the primary table. Is it possible
to synchronize the datagridview with the primary table using a datarelation?
How to do this?

Thanks,
Rich
 
I came up with one solution for using currencyManager and synchronizing rows
from primary table to datagridview2, but it is not ideal because it involves
binding currencymanager to datagridview1, so my textboxes do not display the
current data.. The goal is to be able to iterate through Primary table and
display that data in the textboxes and the corresponding rows in
datagridview2. I also tried some code that will bind the currencyManager to
the dataRelation, but does not iterate through the Primary table. Here is
what I have so far which uses the currencyManager bound to datagridview1:
______________________________________________
....
curMgr = CType(Me.DataGridView1.BindingContext(ds, "Primary"),
CurrencyManager)
DataGridView1.DataSource = ds
DataGridView2.DataSource = ds

DataGridView1.DataMember = "Primary"
DataGridView2.DataMember = "Primary.relPrimarySecondary"
End Sub

Sub curMrgInc()
curMgr.Position =+ 1
End Sub
-----------------------------------------------------
Here is the binding of currencyManager to the datarelation:

curMgr = CType(Me.BindingContext(ds, "Primary.relPrimarySecondary"),
CurrencyManager)

But this does not iterate anything. My alternative would be to have 2
currencyManagers - One for the datagridviews and one for the textboxes. The
goal is to be able to iterate through Primary Table - display the current row
in the textboxes and display the corresponding rows from Secondary Table in
the datagridview - using only one currencyManager. The only way I have been
able to do this so far is by using Dataview.Rowfilter. How can I bind
currencyManager to Primary Table and have Secondary Table synchronized with
Primary?
 
Rich,

I did not investigate your latest problem, but I am afraid I did this
already to often.

I have the idea that you are now at the limitations of the relations about
which I was speaking in the first messages of the problem.

At least I cannot reach the currency manager with the relations. Therefore
we have as well that sample of faking a datarelation on our website using
the dataview.

Does not helps you, but maybe it helps, that you are not the only one with
this problem.

Cor
 
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