Hello,
If the data consumer doesn't move forward or backward the data pointer, a single datasource is enough. However, if the
position is changed, we need to use the way that I introduced to make sure that each data is independent.
Thanks.
Best regards,
Yanhong Huang
Microsoft Online Partner Support
Get Secure! -
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This posting is provided "AS IS" with no warranties, and confers no rights.
--------------------
!From: "JLeary" <
[email protected]>
!References: <#
[email protected]> <
[email protected]>
!Subject: Re: Efficient way to display a dropdown description value when only the key is in the result set
!Date: Tue, 5 Aug 2003 16:58:27 -0400
!Lines: 81
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!
!I accomplished what I needed by just adding a label with the descriptive
!field of the datasource I was using to populate my dropdown in edit mode. In
!non-edit mode, I display the label and in edit mode the dropdown. Both are
!populated/defined by the same datasource.
!
!!> Hello,
!>
!> If you want to bind different controls to a sa me datasource(for examle
!look up the ID from the Tires table for columns
!> LeftTire and RightTire in table Cars) the both of the ComboBoxes will get
!the same CurrencyManager (this.BindingContext
!> [dataset.Tires]). So when you change one of the ComboBoxes then both of
!them will change. To avoid that you have two
!> options:
!>
!> 1. Use different BindingContextes.
!> leftTireCombo.BindingContext = new BindingContext();
!> rightTireCombo.BindingContext = new BindingContext();
!> The problem is that you will not be able to bind the two ComboBoxes to the
!same position in Cars since they will get different
!> CurrencyManagers in table Cars too.
!>
!> 2. Bind to different DataViews.
!> leftTireCombo.DataSource = new DataView(dataset.Tires);
!> rightTireCombo.DataSource = new DataView(dataset.Tires);
!>
!> Hope that helps.
!>
!> Best regards,
!> Yanhong Huang
!> Microsoft Online Partner Support
!>
!> Get Secure! -
www.microsoft.com/security
!> This posting is provided "AS IS" with no warranties, and confers no
!rights.
!>
!> --------------------
!> !From: "JLeary" <
[email protected]>
!> !Subject: Efficient way to display a dropdown description value when only
!the key is in the result set
!> !Date: Thu, 31 Jul 2003 15:59:30 -0400
!> !Lines: 16
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!> !
!> !Hi all,
!> !
!> !I have a results set with a column ( project_id ) which is associated
!with a
!> !dropdown in datagrid edit mode. When not in edit mode, I also want to
!> !display the description for this value. I know I can add a join to my
!Select
!> !statement, but that really isn't too efficient for multiple columns like
!> !this. Since I am already creating a datasource for the dropdown, would it
!> !make sense just to cross-reference that source and change the display in
!> !ItemDataBound? I know there are multiple ways to do this, I just want to
!do
!> !it the most efficient.
!> !
!> !Thanks in advance.
!> !
!> !
!> !
!> !
!> !
!>
!>
!
!
!
