i'm use 3 combobox databounded in my form.

The recommended way to avoid this is to use BindingSource objects.

The BindingSource acts as an intermediary between your control and the actual data object (such as a DataTable). Each BindingSource tracks a current record, so you need 3 BindingSources, one for each ComboBox. Bind each ComboBox to a BindingSource and bind all of the BindingSources to the same object (DataTable, BindingList, etc.).

Or, use copies of the DataTable, end result is the same (assuming that your DataSource is a DataTable and not some other kind of object).

cboOne.DataSource = MyDataTable.Copy();
cboTwo.DataSource = MyDataTable.Copy();
cboThree.DataSource = MyDataTable.Copy();

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~~Bonnie Berent [C# MVP]

The recommended way to avoid this is to use BindingSource objects.

The BindingSource acts as an intermediary between your control and the actual data object (such as a DataTable). Each BindingSource tracks a current record, so you need 3 BindingSources, one for each ComboBox. Bind each ComboBox to a BindingSource and bind all of the BindingSources to the same object (DataTable, BindingList, etc.).

Or, use copies of the DataTable, end result is the same (assuming that your DataSource is a DataTable and not some other kind of object).

cboOne.DataSource = MyDataTable.Copy();
cboTwo.DataSource = MyDataTable.Copy();
cboThree.DataSource = MyDataTable.Copy();

---

~~Bonnie Berent [C# MVP]