DataGridView DateTimeColumn DBNull error

Hi Ewan,

I cannot reproduce. Tried this to add null and DBValue.Null  to a DateTime column in a DataTable.

 var t = new DataTable();
 t.Columns.Add("C1", typeof(DateTime));
 t.Columns.Add("C2", typeof(Decimal));
 t.Columns.Add("C3", typeof(Boolean));
 t.Rows.Add(null, null, null);
 t.Rows.Add(DBNull.Value, DBNull.Value, null);
 t.Rows.Add(DateTime.Now, 5.5m, true);

Population works ok. Then on a click:

 dt.Rows.Add(null, null, null);
 dt.Rows.Add(DBNull.Value, DBNull.Value, null);

Which also works fine. Tried the same in winforms too.

Do you have a CellStyle or column.DefaultCellStyle saved in InitializeComponent() or in code? The main fix related to the previous issue you reported was that the DataGridViewColumn defined the wrong DefaultCellStyle.DataSourceNullValue = DateTime.MinValue when it should have been DefaultCellStyle.DataSourceNullValue = DBNull.Value.

Can you send me directly a reproducible case or a code snippet? Use my email address. I’d like to address this issue.