combo1.DataSource = myDataset.Tables[0];
combo1.BindingContext = new BindingContext();
combo2.DataSource = myDatasetTables[0];
combo2.BindingContext = new BindingContext();
combo1.BindingContext = new BindingContext();
combo2.DataSource = myDatasetTables[0];
combo2.BindingContext = new BindingContext();