Hi all,
I am having a problem with inserting rows in to my datagridview control. The 
datagridview is bound to a bindingsource with a filter set. If i try and add 
a row to the datagridview while the filter is set i get an 
IndexOutOfRangeException specifying that the index of the row i have just 
added does not exist.

The exception occurs when i try and access the datagridview.currentrow 
property in my rowvalidating event handler, or alternatively 
datagridview.rows(e.rowindex).

        void ValidateRow(object sender, DataGridViewCellCancelEventArgs e)
        {
            DataGridView tmpDGV = ((DataGridView)sender);
            try
            {
                if (tmpDGV.IsCurrentRowDirty && tmpDGV.CurrentRow != null)
                {
                    if (Properties.Settings.Default.validation && 
RowHasValiadtionErrors(tmpDGV.CurrentRow))
                    {
                        MessageBox.Show("invalid format.", "Segment Format 
Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                        e.Cancel = true;
                    }
                    else
                    {
                        PersistCellErrors(tmpDGV.CurrentRow);
                    }
                }
                tmpDGV.InvalidateRow(e.RowIndex);
            }
            catch (IndexOutOfRangeException ex)
            {
                //filtered row addition will throw this
                tmpDGV.InvalidateRow(e.RowIndex);
            }

If i debug this code and step through it i can see that when i have finished 
editing the new record and hit enter the row validating event handler fires. 
This works fine at first. The row validating event handler then fires a 
second time and this is when the exception is thrown. I can catch the 
exception and it would seem that the row is successfully added to the 
datagridview however I'd like to know what it is that is causing this 
behavior.

Any help would be greatly appreciated as I am stumped on this one!

Thanks.

Imran

I forgot to mention one thing. 

I have also managed to narrow down the conditions that cause the error and 
it seems to surface if i have a filter set for a particular column value. For 
example if I have a filter set to name = bob and attempt to add a row but 
specify name = bill i will get the IndexOutOfRangeException.