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csharp/sum-of-multiples/README.md

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+# Sum Of Multiples
+
+Given a number, find the sum of all the multiples of particular numbers up to
+but not including that number.
+
+If we list all the natural numbers up to but not including 20 that are
+multiples of either 3 or 5, we get 3, 5, 6 and 9, 10, 12, 15, and 18.
+
+The sum of these multiples is 78.
+
+Given a number, find the sum of the multiples of a given set of numbers,
+up to but not including that number.
+
+## Hints
+This exercise requires you to process a collection of data. You can simplify your code by using LINQ (Language Integrated Query).
+For more information, see [this page](https://docs.microsoft.com/en-us/dotnet/articles/standard/using-linq).
+
+### Submitting Exercises
+
+Note that, when trying to submit an exercise, make sure the exercise file that you're submitting is in the `exercism/csharp/<exerciseName>` directory.
+
+For example, if you're submitting `bob.cs` for the Bob exercise, the submit command would be something like `exercism submit <path_to_exercism_dir>/csharp/bob/bob.cs`.
+## Source
+
+A variation on Problem 1 at Project Euler [http://projecteuler.net/problem=1](http://projecteuler.net/problem=1)
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

csharp/sum-of-multiples/SumOfMultiples.cs

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+using System;
+using System.Collections.Generic;
+
+public static class SumOfMultiples
+{
+    public static int To(IEnumerable<int> multiples, int max)
+    {
+        throw new NotImplementedException("You need to implement this function.");
+    }
+}

csharp/sum-of-multiples/SumOfMultiples.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp1.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Remove="Example.cs" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.0.0" />
+    <PackageReference Include="xunit" Version="2.2.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.2.0" />
+  </ItemGroup>
+
+</Project>

csharp/sum-of-multiples/SumOfMultiplesTest.cs

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+using Xunit;
+
+public class SumOfMultiplesTest
+{
+    [Fact]
+    public void Sum_to_1()
+    {
+        Assert.Equal(0, SumOfMultiples.To(new[] { 3, 5 }, 1));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Sum_to_3()
+    {
+        Assert.Equal(3, SumOfMultiples.To(new[] { 3, 5 }, 4));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Sum_to_10()
+    {
+        Assert.Equal(23, SumOfMultiples.To(new[] { 3, 5 }, 10));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Sum_to_100()
+    {
+       Assert.Equal(2318, SumOfMultiples.To(new[] { 3, 5 }, 100));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Sum_to_1000()
+    {
+        Assert.Equal(233168, SumOfMultiples.To(new[] { 3, 5 }, 1000));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Sum_to_20()
+    {
+        Assert.Equal(51, SumOfMultiples.To(new [] { 7, 13, 17 }, 20));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Sum_to_10000()
+    {
+        Assert.Equal(2203160, SumOfMultiples.To(new [] { 43, 47 }, 10000));
+    }
+}