在DataGridView中循环遍历返回System.OutOfMemoryException

Question

我有一些简单的代码可以解析有300,000行的DataGridView。当i = 190,000时，抛出System.OutOfMemoryException。是否有可能解析我的所有DataGridView行，或者我必须找到另一种解决方案吗？

Dim dt As New DataTable()
    dt = ReadTextFile()
    GridEx2.DataSource = dt
    ' I can delete all rows that I don't need
    'and after that i insert all into my table
    For i As Integer = 0 To GridEx2.Rows.Count - 1
        If GridEx2.Rows(i).Cells(0).Value & "" & GridEx2.Rows(i).Cells(1).Value & "" <> "" Then
            Dim dictionary As New Dictionary(Of String, String)
            'here i have an another grid where I select table column name = grid column name
            'one row contains 2 column table column name and grid column name
            For j As Integer = 0 To GridEx1.Rows.Count - 1
                Dim tabCol As String = GridEx1.Rows(j).Cells(tableColumnName)
                Dim gridCol As String = GridEx1.Rows(j).Cells(gridColumName)
                dictionary(tabCol) = GridEx2.Rows(i).Cells(gridCol).Value
            Next
            'here I parse my dictionary and insert into DB
        End If
    Next