DataGridView 只有空白单元格

Question

在我早期的 vb 项目中，我将 SQL 服务器数据拉到 GridView。 数据表已正确填充数据。 但是在将其分配给 Gridview 后，我看到只添加了空白单元格。 我已经给出了下面的代码以供参考。 你能请任何人指出真正的问题吗？

Public Class Form1
    Dim ProductsTable As New DataTable
    Private myCmd As SqlCommand
    Private myReader As SqlDataReader
    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        'TODO: This line of code loads data into the 'Db1DataSet1.contacts' table. You can move, or remove it, as needed.

    End Sub

    Private Sub ToolStripMenuItem1_Click(sender As Object, e As EventArgs) Handles MainMenu.Click

    End Sub

    Private Sub ExitToolStripMenuItem_Click(sender As Object, e As EventArgs) Handles ExitToolStripMenuItem.Click

    End Sub

    Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
        Dim conn As SqlConnection = New SqlConnection("Data Source=DESKTOP-ULJLSF8\MMSQL2008;Initial Catalog=products;Integrated Security=True;")

        Dim Sqlc As New SqlCommand("SELECT id,barcode FROM dbo.items", conn)
        conn.Open()


        Dim DataReader As SqlDataReader = Sqlc.ExecuteReader()
        ProductsTable.Load(DataReader)
        ProductsTable.AcceptChanges()

        DataGridView1.DataSource = ProductsTable


    End Sub
End Class