add a row to DataGridView

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C#3.5

I want to programmatically add a row to DataGridView (a datasource was
binded with it), but when I call the method DataGridView.Rows.Add, a
System.InvalidOperationException will be thrown and the error message is:
Rows cannot be programmatically added to the DataGridView's rows
collection when the control is data-bound.

private void add_click(object sender, EventArgs e)
{
 try
 {
    DataRow row = db1.NewRow();
    dataGridView2.Rows.Add(dataGridView2.CurrentRow.Index);
    sda.Update(db1);
 }
 catch (Exception exceptionObj)
 {
   System.Windows.Forms.MessageBox.Show(exceptionObj.Message.ToString());
 }

}

What code change should be done to dynamically add a row to datagrid when it is bound to data source.?