Comboboxcolumn in gridview 'almost' working... 'default' value doesn't display when initializing

Using:
--Visual Studio 2010
--Winform app
--.net 4.0

I've got a Forms application that is using a comboboxcolumn in a gridview. The data is sourced from an XML file but I need to add a column to the Gridview which is a 'drop-down' list from which the user can make various choices.

Everything seems to work (drop-down list created, user can select item from list, I can read selected item, etc; almost perfect).

The only thing that doesn't work is that upon initialization, I can't seem to display the default value. I can set the default value, and I know it is set because I can retrieve the data which verifies indeed that the default has been set correctly.

But all I see in the gridview is a blank column when I start; if I select an item from the drop-down list, the selected item is displayed.

Basic code snippets here:

// Read XML data
AlarmTypes.dsAlarms.ReadXml(fsReadXml);

// Bind data to gridview
AlarmsGridView.DataSource = AlarmTypes.dsAlarms;

//Create new comboboxcolumn control
DataGridViewComboBoxColumn comboboxColumn = new DataGridViewComboBoxColumn();

// initialize combobox list
foreach (string s1 in ObservationNames)
comboboxColumn.Items.AddRange(s1);

// add control to gridview
AlarmsGridView.Columns.Insert(0, comboboxColumn);

       // some stuff I've tried (among dozens of other things; following code sets default but it is still
       // not displayed upon initialization

   DataGridViewComboBoxCell cell = (DataGridViewComboBoxCell) AlarmsGridView.Rows[0].Cells[0];
   cell.Value = "berry";         // this is 3rd item in list (and yes, 'berry' is spelled correctly in list)
   cell.Selected = true;

Any ideas?

Thanks.

2 Replies

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Dick15y ago
Thanks, but SelectedIndex is not a member of DataGridViewComboBoxColumn :(

I think what may be happening is that the new columns added are not bound to the dataset; I will be trying to do that next.
Amit Choudhary15y ago
hi friend,

after the below statement
foreach (string s1 in ObservationNames)
comboboxColumn.Items.AddRange(s1);

set the selected index value:
for e.g., MyComboBox.SelectedIndex= 5

Hope this helps.

Thanks.