Question

Basically I have a datagridview which I retrieve from database and 3 of the database field column I combine into a column in datagridview.

But now the problem come, I need to do update but before that I need to validate what the user have editing before click on the update button, but I don’t know how to validate them when they are in the same column in the datagridview.

I am able to validate a column with only one database field

p.s I am doing editing and updating in the datagridview, I need to validate that 3 database field column.

This is how I call my databasase into the datagridview

ps. the position is int

protected void BindStaff()
{
  SqlConnection conn = new SqlConnection("Data Source=.\\SQLEXPRESS;Initial Catalog=BRandCom;Integrated Security=True");
  SqlDataAdapter adapter = new SqlDataAdapter("SELECT StaffID, (StaffName+','+ StaffNRIC+','+ Position + ';')as StaffDetail, yearIn, age, address, email, stayIndicator FROM StaffBook", conn);
  DataSet ds = new DataSet();
  adapter.Fill(ds);
  DGVStaffBook.DataSource = ds.Tables[0];
}

this is the column i am saying i am able to validate (only one database field column)

private void DGVStaffBook_CellEndEdit(object sender, DataGridViewCellEventArgs e)
    {
      if (e.RowIndex >= 0 && e.ColumnIndex >= 0)
      {

        int stayInd;

       if (e.ColumnIndex == 6)
        {
          stayInd = Convert.ToInt32(DGVStaffBook.Rows[e.RowIndex].Cells[e.ColumnIndex].Value);

          if (stayInd != 0 && stayInd != 1)
          {
            MessageBox.Show("Please enter only 1 or 0");
            DGVStaffBook.Rows[e.RowIndex].Cells[e.ColumnIndex].Value = DBNull.Value;
          }
          else
            return;

        }
      }

    }

i try this for position , but it give me error: input string was not correct format

  private void DGVStaffBook_CellEndEdit(object sender, DataGridViewCellEventArgs e)
        {
            if (e.RowIndex >= 0 && e.ColumnIndex >= 0)
            {

                             if (e.ColumnIndex == 1)
                {
                    String[] position = null;
                    position = Convert.ToString(DGVStaffBook.CurrentRow.Cells[1].Value).Split(',');

                    if (int.Parse(position[2]) != 1 && int.Parse(position[2])!=2 ) 
                    {
                        MessageBox.Show("Please Update number type accordingly:" + Environment.NewLine + "1  - High rank only " + Environment.NewLine + "2  -Low Rank" );
                    }
                    else 
                        return;

                }
            }

        }

Answer 1

IMO displaying 3 database fields and allowing the user to edit the same in one column is dangerous. Suggest you to show them as 3 separate columns instead.

Maybe you can also try by making the 3 corresponding properties and merge them via a separator like | which would not occur in your fields via a fourth property. Now when you get the value split the same on | and perform your checks and also assign back those respective values to the 3 corresponding properties. (But i wouldn’t recommend this)
Field1 Field2 Field3

StaffDetails — Field1+”|” +Field2+”|” + Field3

Then use e.FormattedValue.ToString() and split this on |to get string[] of 3 ,now validate

Also you can take a look on creating a Column of MaskedTextBox this will also help but the User experience is gonna be pathetic