Добавьте файлы проекта.

exem_var3.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.2.32526.322
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "exem_var3", "\main\RDP\31П\БыковаАА\Desktop\exem_Bykova31p\exem_var3\exem_var3\exem_var3.csproj", "{7BAF6DAC-E394-42D9-97C4-CA19B1F24EE6}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{7BAF6DAC-E394-42D9-97C4-CA19B1F24EE6}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7BAF6DAC-E394-42D9-97C4-CA19B1F24EE6}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7BAF6DAC-E394-42D9-97C4-CA19B1F24EE6}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7BAF6DAC-E394-42D9-97C4-CA19B1F24EE6}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {63010AE3-EFF1-4B9E-9B9D-F5D067D7225C}
+	EndGlobalSection
+EndGlobal

exem_var3/Deb.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Diagnostics;
+using System.IO;
+
+namespace exem_var3
+{
+    internal class Deb
+    {
+        public static void diagW(string str) 
+        {
+            TextWriterTraceListener x = new TextWriterTraceListener(File.AppendText("diagW.txt"));
+            Trace.Listeners.Add(x);
+            Debug.WriteLine(str);
+            Debug.Flush();
+            x.Close();
+        }
+    }
+}

exem_var3/Mod1.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace exem_var3
+{
+    internal class Mod1
+    {
+    }
+}

exem_var3/Program.cs

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+using System;
+
+namespace exem_var3
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            
+
+
+        }
+    }
+}

exem_var3/exem_var3.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>