diff --git a/89_Tic-Tac-Toe/csharp/tictactoe1/Program.cs b/89_Tic-Tac-Toe/csharp/Program.cs
similarity index 100%
rename from 89_Tic-Tac-Toe/csharp/tictactoe1/Program.cs
rename to 89_Tic-Tac-Toe/csharp/Program.cs
diff --git a/89_Tic-Tac-Toe/csharp/tictactoe1/tictactoe1.csproj b/89_Tic-Tac-Toe/csharp/TicTacToe.csproj
similarity index 100%
rename from 89_Tic-Tac-Toe/csharp/tictactoe1/tictactoe1.csproj
rename to 89_Tic-Tac-Toe/csharp/TicTacToe.csproj
diff --git a/89_Tic-Tac-Toe/csharp/TicTacToe.sln b/89_Tic-Tac-Toe/csharp/TicTacToe.sln
index c26bd1b4..f334433a 100644
--- a/89_Tic-Tac-Toe/csharp/TicTacToe.sln
+++ b/89_Tic-Tac-Toe/csharp/TicTacToe.sln
@@ -1,22 +1,25 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 16
-VisualStudioVersion = 16.0.30114.105
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.32014.148
 MinimumVisualStudioVersion = 10.0.40219.1
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "tictactoe1", "tictactoe1\tictactoe1.csproj", "{FE9379CF-AF73-43DA-8FEC-2BCA7FA13A5E}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "TicTacToe", "TicTacToe.csproj", "{A318881A-DA1A-499C-8820-69A1BF02B824}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
 		Release|Any CPU = Release|Any CPU
 	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{A318881A-DA1A-499C-8820-69A1BF02B824}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A318881A-DA1A-499C-8820-69A1BF02B824}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A318881A-DA1A-499C-8820-69A1BF02B824}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A318881A-DA1A-499C-8820-69A1BF02B824}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
 	EndGlobalSection
-	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{FE9379CF-AF73-43DA-8FEC-2BCA7FA13A5E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{FE9379CF-AF73-43DA-8FEC-2BCA7FA13A5E}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{FE9379CF-AF73-43DA-8FEC-2BCA7FA13A5E}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{FE9379CF-AF73-43DA-8FEC-2BCA7FA13A5E}.Release|Any CPU.Build.0 = Release|Any CPU
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {B5343227-EE3B-4829-AC09-DF6702D24501}
 	EndGlobalSection
 EndGlobal