--- a/ServerMonitor/Forms/SettingsForm.cs	Sun Jun 02 17:55:38 2019 -0400
+++ b/ServerMonitor/Forms/SettingsForm.cs	Fri Jun 14 21:01:55 2019 -0400
@@ -1,6 +1,8 @@
 using Microsoft.Win32;
 using ServerMonitorApp.Properties;
 using System;
+using System.IO;
+using System.Linq;
 using System.Text.RegularExpressions;
 using System.Windows.Forms;
 
@@ -11,6 +13,8 @@
     {
         private readonly string autorunKey = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Run";
         private readonly string autorunName = "ServerMonitor";
+        private readonly string[] soundOptions = { "None", "Windows error", "Custom sound..." };
+        private readonly int customSoundIndex = 2;
 
         public SettingsForm()
         {
@@ -26,6 +30,14 @@
                 comboBox.DataSource = Enum.GetValues(typeof(FailAction));
                 comboBox.Format += FailActionComboBox_Format;
             }
+            // Populate the sound options combo boxes.
+            foreach (ComboBox comboBox in new object[] { ErrorSoundComboBox, WarningSoundComboBox, InformationSoundComboBox })
+            {
+                comboBox.Items.AddRange(soundOptions);
+                // Add the already-selected custom sound, if any.
+                if (getSoundSettingIndex(comboBox) == customSoundIndex)
+                    comboBox.Items.Insert(customSoundIndex, getSoundSetting(comboBox));
+            }
             // Initialize controls with current settings.
             AutorunCheckBox.Checked = GetAutorun();
             KeepRunningCheckBox.Checked = Settings.Default.HideToNotificationArea;
@@ -33,6 +45,9 @@
             ErrorComboBox.SelectedItem = Settings.Default.ErrorAction;
             WarningComboBox.SelectedItem = Settings.Default.WarningAction;
             InformationComboBox.SelectedItem = Settings.Default.InformationAction;
+            ErrorSoundComboBox.SelectedIndex = getSoundSettingIndex(ErrorSoundComboBox);
+            WarningSoundComboBox.SelectedIndex = getSoundSettingIndex(WarningSoundComboBox);
+            InformationSoundComboBox.SelectedIndex = getSoundSettingIndex(InformationSoundComboBox);
         }
 
         /// <summary>Gets whether an autorun registry key for this program exists.</summary>
@@ -71,6 +86,9 @@
             Settings.Default.ErrorAction = (FailAction)ErrorComboBox.SelectedItem;
             Settings.Default.WarningAction = (FailAction)WarningComboBox.SelectedItem;
             Settings.Default.InformationAction = (FailAction)InformationComboBox.SelectedItem;
+            Settings.Default.ErrorSound = getSelectedSound(ErrorSoundComboBox);
+            Settings.Default.WarningSound = getSelectedSound(WarningSoundComboBox);
+            Settings.Default.InformationSound = getSelectedSound(InformationSoundComboBox);
             Settings.Default.Save();
             SetAutorun(AutorunCheckBox.Checked);
             Close();
@@ -81,5 +99,81 @@
         {
             Close();
         }
+
+        /// <summary>Shows a file browser when "Custom cound..." is selected.</summary>
+        private void SoundComboBox_SelectedIndexChanged(object sender, EventArgs e)
+        {
+            ComboBox comboBox = (ComboBox)sender;
+            // Show the dialog if the last item is selected.
+            if (comboBox.SelectedIndex == comboBox.Items.Count - 1)
+            {
+                OpenFileDialog dialog = new OpenFileDialog()
+                {
+                    Title = "Select audio file",
+                    Filter = "Audio files (*.wav;*.mp3;*.wma,*.aif,*.aiff,*.asf,*.aac,*.m4a)|*.wav;*.mp3;*.wma,*.aif,*.aiff,*.asf,*.aac,*.m4a|All files (*.*)|*.*"
+                };
+                if (dialog.ShowDialog() == DialogResult.OK)
+                {
+                    // Remove the previous custom sound, if any.
+                    if (comboBox.Items.Count > soundOptions.Length)
+                        comboBox.Items.RemoveAt(customSoundIndex);
+                    // Add the custom sound and mark it as selected.
+                    comboBox.Items.Insert(customSoundIndex, dialog.FileName);
+                    comboBox.SelectedIndex = customSoundIndex;
+                }
+                else
+                {
+                    // Restore the existing setting if the dialog was cancelled.
+                    comboBox.SelectedIndex = getSoundSettingIndex(comboBox);
+                }
+            }
+        }
+
+        /// <summary>Shows only the filename of the custom sound.</summary>
+        private void SoundComboBox_Format(object sender, ListControlConvertEventArgs e)
+        {
+            ComboBox comboBox = (ComboBox)sender;
+            if (!soundOptions.Contains(e.Value))
+                e.Value = Path.GetFileName(e.Value.ToString());
+        }
+
+        /// <summary>Returns the selected sound for a combo box as stored in program settings.</summary>
+        /// <param name="comboBox">The combo box to read from.</param>
+        /// <returns>
+        /// The index ("0" or "1") of the selected option, or the
+        /// path to the custom sound if a custom sound is selected.
+        /// </returns>
+        private string getSelectedSound(ComboBox comboBox)
+        {
+            return comboBox.SelectedIndex == customSoundIndex ? comboBox.SelectedItem.ToString() : comboBox.SelectedIndex.ToString();
+        }
+
+        /// <summary>Reads the sound setting for a combobox from program settings.</summary>
+        /// <param name="comboBox">The combo box to read data for.</param>
+        /// <returns>
+        /// The index ("0" or "1") of the selected option, or the
+        /// path to the custom sound if a custom sound is selected.
+        /// </returns>
+        private string getSoundSetting(ComboBox comboBox)
+        {
+            string setting = string.Empty;
+            if (comboBox == ErrorSoundComboBox)
+                setting = Settings.Default.ErrorSound;
+            if (comboBox == WarningSoundComboBox)
+                setting = Settings.Default.WarningSound;
+            if (comboBox == InformationSoundComboBox)
+                setting = Settings.Default.InformationSound;
+            return setting;
+        }
+
+        /// <summary>Gets the index of the combo box item that corresponds to its program sound setting.</summary>
+        /// <param name="comboBox">The combo box to read data for.</param>
+        /// <returns>The index of the combo box item that corresponds to its program sound setting.</returns>
+        private int getSoundSettingIndex(ComboBox comboBox)
+        {
+            // If the string is not numeric, it contains the path to the custom sound.
+            return int.TryParse(getSoundSetting(comboBox), out int index) ? index : customSoundIndex;
+        }
+
     }
 }