Converti il ​​contenuto della cella in collegamento ipertestuale in MySQL Datagridview

Puoi utilizzare l'evento click cell datagridview.

Private Sub MyDataGridView_CellClick(ByVal sender As Object, ByVal e As DataGridViewCellEventArgs) Handles MyDataGridView.CellClick
  If MyDataGridView.Columns(e.ColumnIndex).HeaderText = "email" then        
    Dim selectedEMailCell As DataGridViewCell = MyDataGridView.Rows(e.RowIndex).Cells(e.ColumnIndex)
    If selectedEMailCell.Value IsNot Nothing Then       
      System.Diagnostics.Process.Start("mailto:" & selectedEMailCell.Value.ToString)
    End If
  End If
End Sub