Does anybody call help me?

I am trying to set focus a cell.

I enter data in datagridview cell and then press tab to next cell. before enter next cell, I want to do some validation on the data entered in the first cell. if the data not validate value, clear the data and set focus to first cell.

the code would me like this

Private Sub DataGridView1_CellEnter(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellEnter

If DataGridView1.Rows(0).Cells(0).Value <> Nothing Then
DataGridView1.Rows(0).Cells(0).Selected = True
DataGridView1.Rows(0).Cells(0).Value = ""
'DataGridView1.CurrentCell = DataGridView1.Item(0, 0) ------ this give an error

'Operation is not valid because it results in a reentrant call to the SetCurrentCellAddressCore

function.
End If

End Sub