DataSet 已经添加了DataTable 然后把DataSet 绑定到 DataGridView.DataSource 无效。

Question

DataSet 已经添加了DataTable 然后把DataSet 绑定到 DataGridView.DataSource  无效。代码如下

Private Sub cmbStore_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmbStore.SelectedIndexChanged
        Dim dataset As DataSet = DataGridView1.DataSource
        Dim dataTable As DataTable = dataset.Tables(0)
        Dim expression As String
        Dim foundRows() As DataRow
        expression = cmbStore.Text + ">0"
        foundRows = dataTable.Select(expression)
        If (foundRows.Count > 0) Then
            Dim resultDataTable As New DataTable
            Dim resultDataSet As New DataSet
            resultDataTable = ToDataTable(foundRows)
            resultDataSet.Tables.Add(resultDataTable)
            DataGridView1.DataSource = Nothing
            DataGridView1.DataSource = resultDataSet
        End If
    End Sub
    Private Function ToDataTable(ByVal rows() As DataRow) As DataTable
        Dim temp As DataTable
        temp = rows(0).Table.Clone
        For Each row In rows
            temp.ImportRow(row)
        Next
        Return temp
    End Function