Hi Mike,

I'm checking in the columnchanged event of my table. the event gets registered when I initialize my dataset and it also gets called, but won't go into the if clause because the rowstate is "unchanged"

like

public void Table_ColumnChanged(object sender, DataColumnChangeEventArgs e)
        {
            if(e.Row.RowState != DataRowState.Deleted && e.Row.RowState != DataRowState.Unchanged
               && !e.Column.AutoIncrement)
            {
                Delegate Del = Delegate.CreateDelegate(typeof(ValidationDelegate), e.Row,
                                                       String.Format(VALIDATION_METHOD_MASK, e.Column.ColumnName),
                                                       false, false);

                if(Del != null)
                {
                    ValidationErrorObject Vae = ((ValidationDelegate)Del).Invoke();

                    if(Vae.IsValid)
                        e.Row.SetColumnError(e.Row.Table.Columns[e.Column.ColumnName].ColumnName, "");
                    else
                        e.Row.SetColumnError(e.Row.Table.Columns[e.Column.ColumnName].ColumnName, Vae.ErrorString);
                }
            }
        }

Hi,

I don't think this has anything to do with the grid. I tried this out with some very simple sample code and I get the same results. All I did was create a form with a single button on it. Here's the code:

DataTable dt = new DataTable();

        private void Form1_Load(object sender, EventArgs e)
        {
            this.dt.Columns.Add("A", typeof(int));
            this.dt.Rows.Add(new object[] { 1 });
            this.dt.Rows.Add(new object[] { 2 });
            this.dt.Rows.Add(new object[] { 3 });
            this.dt.AcceptChanges();

            this.dt.ColumnChanged += new DataColumnChangeEventHandler(dt_ColumnChanged);
        }

        void dt_ColumnChanged(object sender, DataColumnChangeEventArgs e)
        {
            Debug.WriteLine(e.Row.RowState);            
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.dt.Rows[0][0] = 10;
        }

When I push the button, ColumnChanged fires and the RowState of the row is Unchanged.

But, if I check the RowState in the button click event right after setting the field value, it comes back Modified. So it looks like the RowState is simply not updated at the time when ColumnChanged fires.

Hi Mike

Thank you very much for your effort :-)
I appreciate it.

that's a very interesting thing, I assume I got around it until now by luck.
I'll find another way like BeforeCellUpdate or AfterCellUpdate to achieve what I want.

Sometimes microsoft's events just don't make sense to me.