1 files changed, 102 insertions, 0 deletions
diff --git a/payment/Payment/frmCustomer.cs b/payment/Payment/frmCustomer.cs
new file mode 100644
index 0000000..eb57959
--- /dev/null
+++ b/payment/Payment/frmCustomer.cs
@@ -0,0 +1,102 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace Payment
+{
+	public partial class frmCustomer : Form
+	{
+		public frmCustomer()
+		{
+			InitializeComponent();
+		}
+
+		bool isDataSaved = true;
+
+		private void frmCustomer_Load(object sender, EventArgs e)
+		{
+			cboNames.Items.Add("Mike Smith");
+			cboNames.Items.Add("Nancy Jones");
+		}
+
+		private void frmCustomer_FormClosing(object sender, FormClosingEventArgs e)
+		{
+			if (isDataSaved == false) {
+				string msg = "This form contains unsaved data"
+					+ "\n\nDo you want to save it?";
+
+				DialogResult button =
+					MessageBox.Show(msg, "Customer",
+					MessageBoxButtons.YesNoCancel,
+					MessageBoxIcon.Warning);
+
+				if (button == DialogResult.Yes)
+					if (IsValidData())
+						this.SaveData();
+					else
+						e.Cancel = true;
+				if (button == DialogResult.Cancel)
+					e.Cancel = true;
+			}
+		}
+
+		private void btnSelectPayment_Click(object sender, EventArgs e)
+		{
+			Form payment = new frmPayment();
+			DialogResult selectedButton = payment.ShowDialog();
+			if (selectedButton == DialogResult.OK)
+				lblPayment.Text = (string)payment.Tag;
+		}
+
+		private void btnSave_Click(object sender, EventArgs e)
+		{
+			if (IsValidData())
+				SaveData();
+		}
+
+		private void btnExit_Click(object sender, EventArgs e)
+		{
+			this.Close();
+		}
+
+		private void lblPayment_TextChanged(object sender, EventArgs e)
+		{
+			isDataSaved = false;
+		}
+
+		private void cboNames_SelectedIndexChanged(object sender, EventArgs e)
+		{
+			isDataSaved = false;
+			lblPayment.Text = "";
+		}
+
+		private void SaveData()
+		{
+			cboNames.SelectedIndex = -1;
+			lblPayment.Text = "";
+			isDataSaved = true;
+			cboNames.Focus();
+		}
+
+		private bool IsValidData()
+		{
+			if (cboNames.SelectedIndex == -1) {
+				MessageBox.Show("You must select a customer",
+					"Entry Error");
+				return false;
+			}
+			if (lblPayment.Text == "") {
+				MessageBox.Show("You must enter a payment",
+					"Entry Error");
+				return false;
+			}
+			return true;
+		}
+	}
+}