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2010-03-31T04:58:45.393
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You need to use a <code>DataGridViewComboBoxColumn</code>. There are two ways of populating the drop-down list. You can either set it manually by using the collection returned through the Items property or by binding the column to a data source through the DataSource, DisplayMember and ValueMember properties. This is the same as the WinForms ComboBox control. An example of setting you data source programatically is below: <pre><code>public partial class Form1 : Form { public Form1() { InitializeComponent(); dataGridView1.AutoGenerateColumns = false; List<User> users = new List<User>(); users.Add(new User(){Name = "Fred", Id = 1}); users.Add(new User(){Name = "Jill", Id = 2}); users.Add(new User(){Name = "Bob", Id = 3}); List<Account> accounts = new List<Account>(); accounts.Add(new Account(){AccountName = "Mr Smith", UserId = 1}); accounts.Add(new Account() { AccountName = "Ms Brown", UserId = 2 }); accounts.Add(new Account() { AccountName = "Mr Smith 2", UserId = 1 }); dataGridView1.DataSource = accounts; DataGridViewTextBoxColumn col1 = dataGridView1.Columns[1] as DataGridViewTextBoxColumn; col1.DataPropertyName = "AccountName"; DataGridViewComboBoxColumn col = dataGridView1.Columns[0] as DataGridViewComboBoxColumn; col.DataSource = users; col.DisplayMember = "Name"; col.DataPropertyName = "UserId"; col.ValueMember = "Id"; } } public class User { public string Name { get; set; } public int Id { get; set; } } public class Account { public string AccountName { get; set; } public int UserId { get; set; } } </code></pre> That assumes that in the designer you added a DataGridViewComboBoxColumn as the first column and a DataGridViewTextBoxColumn as the second column. What you should see is that the combo box has the three users available. The DataGridView should have three rows from the data source, for the three Accounts, and the right combo box value shoud be selected for each. A resource you will find very handy for any DataGridView development is the <a href="http://www.windowsclient.net/Samples/Go%20To%20Market/DataGridView/DataGridView%20FAQ.doc" rel="nofollow noreferrer">DataGridView Faq</a>
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.