public string OpenDataFile() { OpenFileDialog openFileDialog1 = new OpenFileDialog(); string a = ""; Dating dating = new Dating(); dating.SetIndex(3); dating.SetValue(2); openFileDialog1.InitialDirectory = ".."; openFileDialog1.Filter = @"txt files (*.*)|*.txt|All files (*.*)|*.*"; openFileDialog1.FilterIndex = 2; openFileDialog1.RestoreDirectory = true; if (openFileDialog1.ShowDialog() == DialogResult.OK) { try { a = openFileDialog1.FileName; } catch (Exception ex) { MessageBox.Show(@"Error al seleccionar archivo: " + ex.Message); } } return(a); }