Save old value time

App.config

@@ -29,6 +29,9 @@
             <setting name="restartNow" serializeAs="String">
                 <value>False</value>
             </setting>
+            <setting name="timer" serializeAs="String">
+                <value>30</value>
+            </setting>
         </RelaunchProcess.Properties.Settings>
         <Process_Auto_Relaunch.Properties.Settings>
             <setting name="startProgramPath" serializeAs="String">

Form1.Designer.cs

@@ -1,4 +1,4 @@
-using System.Windows.Forms;
+using System.Windows.Forms;
 
 namespace Process_Auto_Relaunch
 {
@@ -82,6 +82,7 @@ namespace Process_Auto_Relaunch
             // 
             // numericUpDown1
             // 
+            this.numericUpDown1.DataBindings.Add(new System.Windows.Forms.Binding("Value", global::RelaunchProcess.Properties.Settings.Default, "timer", true, System.Windows.Forms.DataSourceUpdateMode.OnPropertyChanged));
             this.numericUpDown1.Increment = new decimal(new int[] {
             5,
             0,
@@ -103,11 +104,7 @@ namespace Process_Auto_Relaunch
             this.numericUpDown1.Size = new System.Drawing.Size(72, 22);
             this.numericUpDown1.TabIndex = 5;
             this.numericUpDown1.TextAlign = System.Windows.Forms.HorizontalAlignment.Center;
-            this.numericUpDown1.Value = new decimal(new int[] {
+            this.numericUpDown1.Value = global::RelaunchProcess.Properties.Settings.Default.timer;
-            30,
-            0,
-            0,
-            0});
             // 
             // label1
             // 

Properties/Settings.Designer.cs

@@ -106,5 +106,17 @@ namespace RelaunchProcess.Properties {
                 this["restartNow"] = value;
             }
         }
+        
+        [global::System.Configuration.UserScopedSettingAttribute()]
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+        [global::System.Configuration.DefaultSettingValueAttribute("30")]
+        public decimal timer {
+            get {
+                return ((decimal)(this["timer"]));
+            }
+            set {
+                this["timer"] = value;
+            }
+        }
     }
 }

Properties/Settings.settings

@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='utf-8'?>
-<SettingsFile xmlns="http://schemas.microsoft.com/VisualStudio/2004/01/settings" CurrentProfile="(Default)" GeneratedClassNamespace="WindowsFormsApp1.Properties" GeneratedClassName="Settings">
+<SettingsFile xmlns="http://schemas.microsoft.com/VisualStudio/2004/01/settings" CurrentProfile="(Default)" GeneratedClassNamespace="RelaunchProcess.Properties" GeneratedClassName="Settings">
   <Profiles />
   <Settings>
     <Setting Name="startProgramPath" Type="System.String" Scope="User">
@@ -23,5 +23,8 @@
     <Setting Name="restartNow" Type="System.Boolean" Scope="User">
       <Value Profile="(Default)">False</Value>
     </Setting>
+    <Setting Name="timer" Type="System.Decimal" Scope="User">
+      <Value Profile="(Default)">30</Value>
+    </Setting>
   </Settings>
 </SettingsFile>