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Program.cs

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+using System;
+
+namespace Shift_Cipher
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            string shiftedAlphabet = "", finalStr = "", alphabet = "abcdefghijklmnopqrstuvwxyz";
+            Console.Write("Enter a string to be shifted: ");
+            string input = Console.ReadLine();
+            Console.Write("Enter an amount to shift the string between 1 and 25 inclusive: ");
+            string shiftS = Console.ReadLine();
+            int shift = Convert.ToInt32(shiftS);
+            shiftedAlphabet += alphabet.Substring(shift) + alphabet.Substring(0, shift);
+            input = input.ToLower();
+            for(int i = 0; i < input.Length; i++)
+            {
+                if (input.Substring(i, 1).Equals(" "))
+                {
+                    finalStr += " ";
+                    continue;
+                }
+                for(int j = 0; j < alphabet.Length; j++)
+                {
+                    if (input.Substring(i, 1).Equals(alphabet.Substring(j, 1)))
+                        finalStr += shiftedAlphabet.Substring(j, 1);
+                }
+            }
+            Console.WriteLine("Shifted String: " + finalStr);
+
+        }
+    }
+}

Shift_Cipher.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>

Shift_Cipher.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.30320.27
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Shift_Cipher", "Shift_Cipher\Shift_Cipher.csproj", "{3720F8E0-09B0-47FB-AED7-81451CD7558D}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{3720F8E0-09B0-47FB-AED7-81451CD7558D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3720F8E0-09B0-47FB-AED7-81451CD7558D}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3720F8E0-09B0-47FB-AED7-81451CD7558D}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{3720F8E0-09B0-47FB-AED7-81451CD7558D}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {B3BEA252-4714-4C9F-AFD6-06D70481A1CC}
+	EndGlobalSection
+EndGlobal