подключена бд

App.config

@@ -1,5 +1,12 @@
 <?xml version="1.0" encoding="utf-8" ?>
 <configuration>
+    <configSections>
+    </configSections>
+    <connectionStrings>
+        <add name="ПрокатАвто03.Properties.Settings.Prokatavto03ConnectionString"
+            connectionString="Data Source=Class31000;Initial Catalog=Prokatavto03;Integrated Security=True"
+            providerName="System.Data.SqlClient" />
+    </connectionStrings>
     <startup> 
         <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
     </startup>

Prokatavto03DataSet.xsc

@@ -0,0 +1 @@
+

Prokatavto03DataSet.xss

@@ -0,0 +1 @@
+

Properties/Settings.Designer.cs

@@ -1,29 +1,36 @@
 //------------------------------------------------------------------------------
 // <auto-generated>
-//     This code was generated by a tool.
-//     Runtime Version:4.0.30319.42000
+//     Этот код создан программой.
+//     Исполняемая версия:4.0.30319.42000
 //
-//     Changes to this file may cause incorrect behavior and will be lost if
-//     the code is regenerated.
+//     Изменения в этом файле могут привести к неправильной работе и будут потеряны в случае
+//     повторной генерации кода.
 // </auto-generated>
 //------------------------------------------------------------------------------
 
-
-namespace ПрокатАвто03.Properties
-{
+namespace ПрокатАвто03.Properties {
+    
+    
     [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
-    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.VisualStudio.Editors.SettingsDesigner.SettingsSingleFileGenerator", "11.0.0.0")]
-    internal sealed partial class Settings : global::System.Configuration.ApplicationSettingsBase
-    {
-
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.VisualStudio.Editors.SettingsDesigner.SettingsSingleFileGenerator", "16.10.0.0")]
+    internal sealed partial class Settings : global::System.Configuration.ApplicationSettingsBase {
+        
         private static Settings defaultInstance = ((Settings)(global::System.Configuration.ApplicationSettingsBase.Synchronized(new Settings())));
-
-        public static Settings Default
-        {
-            get
-            {
+        
+        public static Settings Default {
+            get {
                 return defaultInstance;
             }
         }
+        
+        [global::System.Configuration.ApplicationScopedSettingAttribute()]
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+        [global::System.Configuration.SpecialSettingAttribute(global::System.Configuration.SpecialSetting.ConnectionString)]
+        [global::System.Configuration.DefaultSettingValueAttribute("Data Source=Class31000;Initial Catalog=Prokatavto03;Integrated Security=True")]
+        public string Prokatavto03ConnectionString {
+            get {
+                return ((string)(this["Prokatavto03ConnectionString"]));
+            }
+        }
     }
 }

Properties/Settings.settings

@@ -1,7 +1,14 @@
 <?xml version='1.0' encoding='utf-8'?>
-<SettingsFile xmlns="http://schemas.microsoft.com/VisualStudio/2004/01/settings" CurrentProfile="(Default)">
-  <Profiles>
-    <Profile Name="(Default)" />
-  </Profiles>
-  <Settings />
-</SettingsFile>
+<SettingsFile xmlns="http://schemas.microsoft.com/VisualStudio/2004/01/settings" CurrentProfile="(Default)" GeneratedClassNamespace="ПрокатАвто03.Properties" GeneratedClassName="Settings">
+  <Profiles />
+  <Settings>
+    <Setting Name="Prokatavto03ConnectionString" Type="(Connection string)" Scope="Application">
+      <DesignTimeValue Profile="(Default)">&lt;?xml version="1.0" encoding="utf-16"?&gt;
+&lt;SerializableConnectionString xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"&gt;
+  &lt;ConnectionString&gt;Data Source=Class31000;Initial Catalog=Prokatavto03;Integrated Security=True&lt;/ConnectionString&gt;
+  &lt;ProviderName&gt;System.Data.SqlClient&lt;/ProviderName&gt;
+&lt;/SerializableConnectionString&gt;</DesignTimeValue>
+      <Value Profile="(Default)">Data Source=Class31000;Initial Catalog=Prokatavto03;Integrated Security=True</Value>
+    </Setting>
+  </Settings>
+</SettingsFile>

ПрокатАвто03.csproj

@@ -65,6 +65,11 @@
       <DependentUpon>Form3.cs</DependentUpon>
     </Compile>
     <Compile Include="Program.cs" />
+    <Compile Include="Prokatavto03DataSet.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DesignTime>True</DesignTime>
+      <DependentUpon>Prokatavto03DataSet.xsd</DependentUpon>
+    </Compile>
     <Compile Include="Properties\AssemblyInfo.cs" />
     <EmbeddedResource Include="Form1.resx">
       <DependentUpon>Form1.cs</DependentUpon>
@@ -84,6 +89,17 @@
       <AutoGen>True</AutoGen>
       <DependentUpon>Resources.resx</DependentUpon>
     </Compile>
+    <None Include="Prokatavto03DataSet.xsc">
+      <DependentUpon>Prokatavto03DataSet.xsd</DependentUpon>
+    </None>
+    <None Include="Prokatavto03DataSet.xsd">
+      <Generator>MSDataSetGenerator</Generator>
+      <LastGenOutput>Prokatavto03DataSet.Designer.cs</LastGenOutput>
+      <SubType>Designer</SubType>
+    </None>
+    <None Include="Prokatavto03DataSet.xss">
+      <DependentUpon>Prokatavto03DataSet.xsd</DependentUpon>
+    </None>
     <None Include="Properties\Settings.settings">
       <Generator>SettingsSingleFileGenerator</Generator>
       <LastGenOutput>Settings.Designer.cs</LastGenOutput>