I've populated all the cells in a combo box column with values from 1 -
50 using the following code:

foreach (DataGridViewRow row in uxTabSummary.Rows)
{
     DataGridViewComboBoxCell cell = (DataGridViewComboBoxCell)
row.Cells["numRows"];
      for (int i = 1; i < 51; i++)
      {
           cell.Items.Add(i);
       }
 }

However, after the user changes a value in the drop down combo box, and
moves the focus to another cell, a "System.ArgumentException:
DataGridViewComboBoxCell value is not valid".

Googling shows an extensive number of people suffering the same, but
I'm none the wiser.

Is there a simple solution to this?

Greg.