Make Combobox in C# Winforms Autocomplete

               // This Code is working properly

               // Just Copy and paste it 

                AutoCompleteStringCollection ac = new AutoCompleteStringCollection();
                foreach (DataRow row in MyDatatable.Rows)
                {
                    //looping through the datatable and adding values from datatable into autocomplete collection
                    ac.Add(row["CustName"].ToString());
                }
                comboCustomerName.AutoCompleteSource = AutoCompleteSource.CustomSource; //assigning  
                // autocomplete source to the combobox
                comboCustomerName.AutoCompleteCustomSource = ac;