填充DataGridView

Question

我的dataGridView不显示数据。因为我是数据库编程的新手，请更正我的代码。

conn.Open()
daRawMaterials = New OleDbDataAdapter("Select * from RawMaterials", conn)
daRawMaterials.Fill(dsRawMaterials, "RawMaterials")
dtRawMaterials = dsRawMaterials.Tables("RawMaterials")
dgvCurrentStock.DataSource = dtRawMaterials

conn.Close()
Currentrow = 0

dgvCurrentStock.Columns.Item(0).HeaderCell.Value = dtRawMaterials.Rows(Currentrow).Item(0)