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.NET Forum / Windows Forms / WinForm General / May 2006DisplayMember is being ignored
Hi, I have the following code to set the DataSource of a ComboBox to a certain table in an untyped DataSet, and I also want to set the DisplayMamaber of the ComboBox to a certain column: cmbID.DataSource = Me.Ds.Tables("Groups") Dim str As String = Me.Ds.Tables("Groups").Columns("CustomerID").ColumnName Me.cmbCustomerID.DisplayMember = str Problem is, I have stepped through this code, and str is assigned the value "CustomerID". I then step over the line where str is assigned as the DisplayMember. However, the value of DisplayMember remains at "". The ComboBox is populated with the appropriate number of items, but each simply says "System.Data.DataRowView". Any ideas? The code was fine, no changes were made, it just suddenly doesn't like it. I then changed some code in another class, ran it, and the ComboBox populated fine. I Ran it again, broken again. Most baffling. Hi, Try "Groups.CustomerID" as the DisplayMember name. > Hi, > [quoted text clipped - 20 lines] > the > ComboBox populated fine. I Ran it again, broken again. Most baffling. As I said, it is an untyped DataSet, and therefore the CustomerID property available with a Typed DataSet is not available here. I managed to sort it out by setting the DisplayMember before setting the DataSource. Don't know why it works but it did. > Hi, > [quoted text clipped - 24 lines] > > the > > ComboBox populated fine. I Ran it again, broken again. Most baffling. What's specified in DisplayMember is the data column name, not a property name. Therefore, should work for untyped datasets as well. > As I said, it is an untyped DataSet, and therefore the CustomerID property > available with a Typed DataSet is not available here. [quoted text clipped - 33 lines] >> > the >> > ComboBox populated fine. I Ran it again, broken again. Most baffling. I understand that the value needed for the DisplayMember is a column name, but if the Dataset is untyped you need to access the table in a fashion like this: Me.Ds.Tables("Groups") whereas when you create a typed dataset, the tables, columns and rows become properties of the DataSet and you can access them like this: Me.ds.Groups This syntax would not work with an untyped DataSet. > What's specified in DisplayMember is the data column name, not a property > name. Therefore, should work for untyped datasets as well. [quoted text clipped - 36 lines] > >> > the > >> > ComboBox populated fine. I Ran it again, broken again. Most baffling. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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