Export GridView to Excel

I am exporting a grid view to Excel and it works fine. My question is: Is there a property that let's me pre-define an excel column prior to export. In my case, column number 6 is numeric with 2 decimals. In case there are whole numbers, the decimal will not show. User always wants to see the decimal regardless. Thank you.

Code:

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Protected Sub Excel_Button_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Excel_Button.Click

        Export1_Clicked = True ' used to bypass switching from ASC to DESC and vice versa

        GridView2.AllowPaging = False
        GridViewSortExpression1 = Session("SortExpression")
        ItemDetailDataTable = Session("ItemDetailDataTable")
        Dim pageIndex2 As Integer = GridView2.PageIndex
        GridView2.DataSource = SortDataTable1(ItemDetailDataTable, False)
        GridView2.DataBind()
        GridView2.PageIndex = pageIndex2

        GridViewExportUtil.Export("EquipmentHours.xls", GridView2)
        GridView2.AllowPaging = True

        Export1_Clicked = False

    End Sub

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