[DateGridView] Convert seconds to minutes

Hi,

I ve connected or better created with the datasource a DataGrid where I have in one column seconds. This seconds I want to display in the format hh:mm:ss.

Fot his I can use this code

Code:

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Dim t As New TimeSpan(0, 0, row.Cells(DataGridViewTextBoxColumn6.Index).Value)

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but eerytime when I try to write it back I get the error that I just can write int32 and I also tried to change it with the DefaultSytle but without luck

Code:

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Private Sub ConvertTime()

        DataGridViewTextBoxColumn6.DefaultCellStyle.ToString()
        For Each row As DataGridViewRow In ProduccionDataGridView.Rows
            If row.Cells(DataGridViewTextBoxColumn6.Index).Value Is DBNull.Value = False Then

                Dim t As New TimeSpan(0, 0, row.Cells(DataGridViewTextBoxColumn6.Index).Value)
                'row.Cells(DataGridViewTextBoxColumn6.Index).Style.Format = "HH:mm:ss"

                'row.Cells(DataGridViewTextBoxColumn6.Index).ToString()
                row.Cells(DataGridViewTextBoxColumn6.Index).Value = (t.Hours & ":" & t.Minutes & ":" & t.Seconds).ToString
                'row.Cells(DataGridViewTextBoxColumn6.Index).Value = DateAndTime
                'row.Cells(DataGridViewTextBoxColumn6.Index).Value = t.Hours & t.Minutes & t.Seconds

            End If
        Next

    End Sub

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Can please someone give me a hint how to solve it?

Thanks
Stephan