Programming Forums > Application Development > C#

Arla · Jul 18th, 2005, 1:29 PM

Okay, not sure if anyone can help, but I figure I'll give it a try.

So I have a generic "List" function that sets up a datatable object with some data.

In my main program I am defining two datatables, I run the list function, create a copy of the datatable that is created, run the list again (with different parameters) and then create a copy of that new datatable.

The issue, trying to get this all to display.

The first list returns 17 records, if I only do that list (and stop) I get a nice list of data using the .DataSource and .DisplayMember methods.

If I then go on and do the second list, I get three records from that, but the first table only shows System.Data.DataRowView instead of the actual data?

Here is some code to try to explain

(Toggle Plain Text)

(call to function)SetupTable(A);
Makes = ExampleTable.Copy();
ComboBox1.DataSource = Makes;
ComboBox1.DisplayMember = "Description";

(if I stop here, this works fine);

SetupTable(B);
Models = ExampleTable.Copy(); (now with different data as I called SetupTable(B) not SetupTable(A))
ComboBox2.DataSource = Models; (this is the line that seems to cause ComboBox1 to forget what it's displaymember is?)
ComboBox1.DisplayMember = "Description";

I tried adding in

ComboBox2.DisplayMember = "Description"; again after the DataSource for ComboBox2 had been set, but that didn't seem to effect anything.

Anyone have any ideas?

Arla · Jul 18th, 2005, 1:36 PM

As a side note, a way round it appears to be, use listBoxes, they work just fine, it just seems to be ComboBoxes that have a wierd issue?

Arla · Jul 18th, 2005, 2:59 PM

Okay, I managed to get it to work, putting in ComboBox1.BeginUpdate and ComboBox1.EndUpdate around the code that puts items into the list seemed to fix it. Not entirely sure I like the solution, but heck it works

Jul 18th, 2005, 1:29 PM	#1
Arla Professional Programmer Join Date: Mar 2005 Posts: 406 Rep Power: 4	Issues with ComboBoxes and DataSources Okay, not sure if anyone can help, but I figure I'll give it a try. So I have a generic "List" function that sets up a datatable object with some data. In my main program I am defining two datatables, I run the list function, create a copy of the datatable that is created, run the list again (with different parameters) and then create a copy of that new datatable. The issue, trying to get this all to display. The first list returns 17 records, if I only do that list (and stop) I get a nice list of data using the .DataSource and .DisplayMember methods. If I then go on and do the second list, I get three records from that, but the first table only shows System.Data.DataRowView instead of the actual data? Here is some code to try to explain (Toggle Plain Text) (call to function)SetupTable(A); Makes = ExampleTable.Copy(); ComboBox1.DataSource = Makes; ComboBox1.DisplayMember = "Description"; (if I stop here, this works fine); SetupTable(B); Models = ExampleTable.Copy(); (now with different data as I called SetupTable(B) not SetupTable(A)) ComboBox2.DataSource = Models; (this is the line that seems to cause ComboBox1 to forget what it's displaymember is?) ComboBox1.DisplayMember = "Description"; I tried adding in ComboBox2.DisplayMember = "Description"; again after the DataSource for ComboBox2 had been set, but that didn't seem to effect anything. (call to function)SetupTable(A); Makes = ExampleTable.Copy(); ComboBox1.DataSource = Makes; ComboBox1.DisplayMember = "Description"; (if I stop here, this works fine); SetupTable(B); Models = ExampleTable.Copy(); (now with different data as I called SetupTable(B) not SetupTable(A)) ComboBox2.DataSource = Models; (this is the line that seems to cause ComboBox1 to forget what it's displaymember is?) ComboBox1.DisplayMember = "Description"; I tried adding in ComboBox2.DisplayMember = "Description"; again after the DataSource for ComboBox2 had been set, but that didn't seem to effect anything. Anyone have any ideas?

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Jul 18th, 2005, 1:36 PM	#2
Arla Professional Programmer Join Date: Mar 2005 Posts: 406 Rep Power: 4	As a side note, a way round it appears to be, use listBoxes, they work just fine, it just seems to be ComboBoxes that have a wierd issue?

Jul 18th, 2005, 2:59 PM	#3
Arla Professional Programmer Join Date: Mar 2005 Posts: 406 Rep Power: 4	Okay, I managed to get it to work, putting in ComboBox1.BeginUpdate and ComboBox1.EndUpdate around the code that puts items into the list seemed to fix it. Not entirely sure I like the solution, but heck it works

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Programming Forums > Application Development > C#

Issues with ComboBoxes and DataSources