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LiamTestTeams/frmPermissionInput.cs

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+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 LiamTestTeams
+{
+    public partial class frmPermissionInput : Form
+    {
+        public frmPermissionInput()
+        {
+            InitializeComponent();
+        }
+
+        private void frmPermissionInput_Load(object sender, EventArgs e)
+        {
+            comboBoxRole.SelectedIndex = 0;
+        }
+
+        private void textBoxEmail_TextChanged(object sender, EventArgs e)
+        {
+            bool isValid = false;
+            if (!string.IsNullOrWhiteSpace(textBoxEmail.Text))
+            {
+                try
+                {
+                    var mail = new System.Net.Mail.MailAddress(textBoxEmail.Text.Trim());
+                    isValid =  mail != null;
+                }
+                catch
+                {
+                }
+            }
+
+            buttonOK.Enabled = isValid;
+        }
+    }
+}