How do I set default values for new rows in my datagrid

You use the DataColumn.DefaultValue property to provide default values for new rows. You access this property through the DataTable associated with the DataGrid,

[C#]
	this.dataGrid1.DataSource = this._dataSet.Tables['orders'];
	....
	....
	this._dataSet.Tables['Orders'].Columns[1].DefaultValue = 'CustID';   // default value for column 1
	this._dataSet.Tables['Orders'].Columns['OrderDate'].DefaultValue = DateTime.Now;  // default value for OrderDate column

[VB.NET]
	Me.dataGrid1.DataSource = Me._dataSet.Tables('Orders')
	....
	....
	Me._dataSet.Tables('Orders').Columns(1).DefaultValue = 'CustID'   ’ default value for column 1
	Me._dataSet.Tables('Orders').Columns('OrderDate').DefaultValue = DateTime.Now   ’ default value for OrderDate column