As far as late binding the DataGridView, it is really easy -- just set the grid's DataSource property. By default the AutoGenerateColumns property is true so it will create the columns. You can set AutoGenerateColumns to false before setting the grid's DataSource property and then add columns yourself (dataGridView.Columns.Add(...)). Set the DataPropertyName value to bind the column. Regarding the combobox, you can dynamically add a combobox column just like a normal column. Set the combobox's DataPropertyName, and create a datasource for the combobox column.

There are a couple of samples in the documentation that show you how to manually databind the grid. Here is one that also shows how to manually databind a combobox column: http://msdn2.microsoft.com/en-us/library/y0wfd4yz.aspx
(EDIT: updated link)

-mark
DataGridView Program Manager
Microsoft
This post is provided "as-is"

I don't understand the "101 sample DataGridView ComboBoxColumn example" comment, the DataGridViewComboBoxColumn supports read/write, it just doesn't support adding new values to the drop-down (it only supports the ComboBox.DropDownStyle = DropDownList)

I'm not familure with ADO objects not using the DataSource wizard, so you'll need to post a question to the .NET Framework Data Access and Storage forum: http://forums.microsoft.com/msdn/ShowForum.aspx?ForumID=45 

Here are the steps that show how to change the column type at design time to a combobox. This example uses the DataSource Wizard:

1) New Windows Forms app
2) Click The Add new datasource option and connect to the Northwind database
3) Select the Products and Categories tables and finish the wizard
4) Drag and drop the Products table from the data sources window to your form to create and databind a DataGridView
5) Right click on the DataGridView and choose Edit Columns
6) Select the CategoryID column and for the column type property change it to a DataGridViewComboboxColumn
7) Goto the DataSource property for the column and expand that until you get to the Categories table
8) Set the DisplayMember to be CategoryName and the ValueMember to be the CategoryID
9) Click ok to dismiss the Edit
10) Run

Hope this helps,
-mark
DataGridView Program Manager
Microsoft
This post is provided "as-is"

As far as late binding the DataGridView, it is really easy -- just set the grid's DataSource property. By default the AutoGenerateColumns property is true so it will create the columns. You can set AutoGenerateColumns to false before setting the grid's DataSource property and then add columns yourself (dataGridView.Columns.Add(...)). Set the DataPropertyName value to bind the column. Regarding the combobox, you can dynamically add a combobox column just like a normal column. Set the combobox's DataPropertyName, and create a datasource for the combobox column.

There are a couple of samples in the documentation that show you how to manually databind the grid. Here is one that also shows how to manually databind a combobox column: http://msdn2.microsoft.com/en-us/library/y0wfd4yz.aspx
(EDIT: updated link)

-mark
DataGridView Program Manager
Microsoft
This post is provided "as-is"

Thanks Mark!

The step 1 to 10 above was really helpful, works fine.

Are there something similarwhen using the Detail-form, instead of the default DataGridView?

Can't find the same type of properties.

Sten-Gunnar