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Binding to Combo Box Problem

Posted on 2010-09-05
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Last Modified: 2013-12-17
I have church membership data which is organized by family (FamilyData), member (MbrData) and Attendance. Attendance is tied to member and member to family. I want to be able to move a family member from one family to another (necessary if children marry to form a new family or if an adult child moves out and creates a new family). The idea was to chose the family and member from one pair of bound combo boxes (losing family) and independently choose a gaining family. Then simply change the member's FamilyID from the losing family to the gaining family. (This is probably naive and bound to fail -- suggestions on a better way would be appreciated.)

Hence, I have one dataset that I want to bind the two family comboboxes to the same table but have them work independently. I am mimicking
http://www.experts-exchange.com/Programming/Languages/.NET/Visual_CSharp/Q_22708357.html?sfQueryTermInfo=1+10+30+bind+combobox 
but not getting the correct response. The second box acts as if it is not bound at all. The FamilyDataBindingSource is the original binding source for the FamilyData table in the CATDataset.

I would appreciate suggestions and/or corrections in the following code.
'The following was generated by the designer -- the first box.
        'cboLosingFamily
        '
        Me.cboLosingFamily.DataSource = Me.FamilyDataBindingSource
        Me.cboLosingFamily.DisplayMember = "FamilyName"
        Me.cboLosingFamily.FormattingEnabled = True
        Me.cboLosingFamily.Location = New System.Drawing.Point(137, 74)
        Me.cboLosingFamily.Name = "cboLosingFamily"
        Me.cboLosingFamily.Size = New System.Drawing.Size(110, 21)
        Me.cboLosingFamily.TabIndex = 6
        Me.cboLosingFamily.ValueMember = "FamilyID"



'The following was coded by me -- the second box.
        With cboGainingFamily
            .DataSource = New BindingSource(CATDataSet.FamilyData, vbNull)
            .DisplayMember = CATDataSet.FamilyData.FamilyNameColumn.ColumnName
            .ValueMember = CATDataSet.FamilyData.FamilyIDColumn.ColumnName
        End With

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Question by:rkulp
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2 Comments
 
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Expert Comment

by:pnedic
ID: 33609824
I'm not sure will it help you but you ca try this.
Try to use DataView as datasource for your combo boxes (both of them). What I'm doing is this (sorry in C#). See bellow the code.
Also you should take care to do following:
when you select someValue in cboLosingFamily combo, to exclude that value in cboGainingFamily, or to set some other kind of this prohibition.
Hope this will give you some help or some additional idea.
Regards

DataView myDV1 = new DataView();
DataView myDV2 = new DataView();
myDV1 = myDataTable.DefaultView;
myDV2 = myDataTable.DefaultView;

cmb1.BindingContext = new BindingContext();  //as MUST
cmb1.ValueMember = "myValueMemb";    //first data from myDataTable
cmb1.DisplayMember = "myDisplMemb";  //second data from myDataTable
cmb1.DataSource = myDV1;

cmb2.BindingContext = new BindingContext();  //as MUST
cmb2.ValueMember = "myValueMemb";    //first data from myDataTable
cmb2.DisplayMember = "myDisplMemb";  //second data from myDataTable
cmb2.DataSource = myDV2;

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rkulp earned 0 total points
ID: 33610779
pnedic,

Thanks for your response. This did not work but I may have done something wrong in the translation. However, I did stumble on the solution. In the designer, I looked at "Other Data Sources" and expanded it until finding the data table. After selecting that the display member and value member worked as usual and all was well. This is what I should have done in the first place.
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