选择数据源后将项目添加到组合框

Question

I want to add an item to the combobox after binding it. for example:

DataSet csuname = new DataSet();
csu.Fill(csuname);
comboBox1.DataSource = csuname.Tables[0];
comboBox1.DisplayMember = "empfname";
comboBox1.Items.Add("all");

but it gets error like

Items collection cannot be modified when the DataSource property is set.

what is the best way to do this?

Answer 1

最好的方法是将该项直接添加到您的数据源csunam.Tables[0] ，我还要假定它必须是一个可观察的集合才能起作用。