Form Using User Control Won't Return Value

I am writing a user control. I want it to return a customer number when the user double clicks on the customer. I can't seem to get it to work. The user control is displayed and, on the double click, the data shows in the messagebox but I can't seem to get it to update the value on the main form.

Anytime I try to add a return value into FindCustomerControl_ItemHasBeenSelected, I get an error. It's like it hangs out in the user control and I can't leave it with a return value. So far, this is what I have:

In my main window:

public partial class TestForm : Form { public TestForm() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { // one close button on the form Close(); } private void ShowSelectFromListWidget() { // show the user control var uc = new FindCustomerControl(); uc.ItemHasBeenSelected += uc_ItemHasBeenSelected; MakeUserControlPrimaryWindow(uc); } void uc_ItemHasBeenSelected(object sender, FindCustomerControl.SelectedItemEventArgs e) { // once it has been selected, change a label on the screen to show the customer number var value = e.SelectedChoice; lblCustomer.Text = value; } } 

In my user control:

public partial class FindCustomerControl : UserControl { public class SelectedItemEventArgs : EventArgs { public string SelectedChoice { get; set; } } public event EventHandler<SelectedItemEventArgs> ItemHasBeenSelected; public FindCustomerControl() { InitializeComponent();} DataTable dt = new DataTable(); public void btnFind_Click(object sender, EventArgs e) { var dt = GetData(); dataGridView1.DataSource = dt; } //Query database public DataTable GetData() { UtilitiesClass ru = new UtilitiesClass(); string connectionString = ru.getConnectionString(); DataTable dt = new DataTable(); SqlConnection myConnection = new SqlConnection(connectionString); myConnection.Open(); SqlCommand cmd = new SqlCommand("FindCustomer", myConnection); cmd.Parameters.AddWithValue("@customer", txtCustomer.Text.Trim()); cmd.CommandType = CommandType.StoredProcedure; SqlDataAdapter ta = new SqlDataAdapter(cmd); ta.Fill(dt); myConnection.Close(); return (dt); } private void dataGridView1_CellDoubleClick(object sender, DataGridViewCellEventArgs e) { var handler = ItemHasBeenSelected; string choice = dataGridView1[0, e.RowIndex].Value.ToString(); // this shows it MessageBox.Show("Chosen: " + e.SelectedChoice); if (handler != null) handler(this, new SelectedItemEventArgs { SelectedChoice = choice }); // I WOULD LIKE TO RETURN A VALUE HERE } } 

It seems as though this should be common enough but, in spite of my hours of research and debugging, I have been unable to come up with a solution. I do know that uc.ItemHasBeenSelected += uc_ItemHasBeenSelected; in TestForm doesn't seem to ever get executed because I put a breakpoint there.