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App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8.1" />
+    </startup>
+</configuration>

MainForm.cs

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+using System;
+using System.Windows.Forms;
+
+namespace Tic_Tac_Toe
+{
+    public partial class MainForm : Form
+    {
+        bool isPlayer1Playing = true;
+        public MainForm()
+        {
+            InitializeComponent();
+        }
+
+        private bool IsSameText(string string1, string string2, string string3) => string.Compare(string1, string2) == 0 && string.Compare(string2, string3) == 0;
+
+        private bool CheckIfSomebodyWons()
+        {
+            if (string.IsNullOrEmpty(buttonField11.Text) ||
+                string.IsNullOrEmpty(buttonField12.Text) ||
+                string.IsNullOrEmpty(buttonField13.Text) ||
+                string.IsNullOrEmpty(buttonField21.Text) ||
+                string.IsNullOrEmpty(buttonField22.Text) ||
+                string.IsNullOrEmpty(buttonField23.Text) ||
+                string.IsNullOrEmpty(buttonField31.Text) ||
+                string.IsNullOrEmpty(buttonField32.Text) ||
+                string.IsNullOrEmpty(buttonField33.Text)
+                )
+            {
+                return false;
+            }
+            return IsSameText(buttonField11.Text, buttonField12.Text, buttonField13.Text) ||
+                IsSameText(buttonField21.Text, buttonField22.Text, buttonField23.Text) ||
+                IsSameText(buttonField31.Text, buttonField32.Text, buttonField33.Text) ||
+                IsSameText(buttonField11.Text, buttonField21.Text, buttonField31.Text) ||
+                IsSameText(buttonField12.Text, buttonField22.Text, buttonField32.Text) ||
+                IsSameText(buttonField13.Text, buttonField23.Text, buttonField33.Text) ||
+                IsSameText(buttonField11.Text, buttonField22.Text, buttonField33.Text) ||
+                IsSameText(buttonField13.Text, buttonField22.Text, buttonField31.Text);
+        }
+
+        private void ButtonField11_Click(object sender, EventArgs e)
+        {
+            buttonField11.Text = isPlayer1Playing ? "O" : "X";
+            isPlayer1Playing = !isPlayer1Playing;
+            buttonField11.Enabled = false;
+            if (CheckIfSomebodyWons())
+            {
+                MessageBox.Show("Gewonnen");
+            }
+        }
+
+        private void ButtonField12_Click(object sender, EventArgs e)
+        {
+            buttonField12.Text = isPlayer1Playing ? "O" : "X";
+            isPlayer1Playing = !isPlayer1Playing;
+            buttonField12.Enabled = false;
+            if (CheckIfSomebodyWons())
+            {
+                MessageBox.Show("Gewonnen");
+            }
+        }
+
+        private void ButtonField13_Click(object sender, EventArgs e)
+        {
+            buttonField13.Text = isPlayer1Playing ? "O" : "X";
+            isPlayer1Playing = !isPlayer1Playing;
+            buttonField13.Enabled = false;
+            if (CheckIfSomebodyWons())
+            {
+                MessageBox.Show("Gewonnen");
+            }
+        }
+
+        private void ButtonField21_Click(object sender, EventArgs e)
+        {
+            buttonField21.Text = isPlayer1Playing ? "O" : "X";
+            isPlayer1Playing = !isPlayer1Playing;
+            buttonField21.Enabled = false;
+            if (CheckIfSomebodyWons())
+            {
+                MessageBox.Show("Gewonnen");
+            }
+        }
+
+        private void ButtonField22_Click(object sender, EventArgs e)
+        {
+            buttonField22.Text = isPlayer1Playing ? "O" : "X";
+            isPlayer1Playing = !isPlayer1Playing;
+            buttonField22.Enabled = false;
+            if (CheckIfSomebodyWons())
+            {
+                MessageBox.Show("Gewonnen");
+            }
+        }
+
+        private void ButtonField23_Click(object sender, EventArgs e)
+        {
+            buttonField23.Text = isPlayer1Playing ? "O" : "X";
+            isPlayer1Playing = !isPlayer1Playing;
+            buttonField23.Enabled = false;
+            if (CheckIfSomebodyWons())
+            {
+                MessageBox.Show("Gewonnen");
+            }
+        }
+
+        private void ButtonField31_Click(object sender, EventArgs e)
+        {
+            buttonField31.Text = isPlayer1Playing ? "O" : "X";
+            isPlayer1Playing = !isPlayer1Playing;
+            buttonField31.Enabled = false;
+            if (CheckIfSomebodyWons())
+            {
+                MessageBox.Show("Gewonnen");
+            }
+        }
+
+        private void ButtonField32_Click(object sender, EventArgs e)
+        {
+            buttonField32.Text = isPlayer1Playing ? "O" : "X";
+            isPlayer1Playing = !isPlayer1Playing;
+            buttonField32.Enabled = false;
+            if (CheckIfSomebodyWons())
+            {
+                MessageBox.Show("Gewonnen");
+            }
+        }
+
+        private void ButtonField33_Click(object sender, EventArgs e)
+        {
+            buttonField33.Text = isPlayer1Playing ? "O" : "X";
+            isPlayer1Playing = !isPlayer1Playing;
+            buttonField33.Enabled = false;
+            if (CheckIfSomebodyWons())
+            {
+                MessageBox.Show("Gewonnen");
+            }
+        }
+    }
+}

MainForm.resx

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+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <metadata name="toolTip.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+    <value>17, 17</value>
+  </metadata>
+  <metadata name="statusStrip.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+    <value>114, 17</value>
+  </metadata>
+  <metadata name="toolStrip.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+    <value>223, 17</value>
+  </metadata>
+</root>

Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace Tic_Tac_Toe
+{
+    static class Program
+    {
+        /// <summary>
+        /// Der Haupteinstiegspunkt für die Anwendung.
+        /// </summary>
+        [STAThread]
+        static void Main()
+        {
+            Application.EnableVisualStyles();
+            Application.SetCompatibleTextRenderingDefault(false);
+            Application.Run(new MainForm());
+        }
+    }
+}

Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// Allgemeine Informationen über eine Assembly werden über die folgenden
+// Attribute gesteuert. Ändern Sie diese Attributwerte, um die Informationen zu ändern,
+// die einer Assembly zugeordnet sind.
+[assembly: AssemblyTitle("Tic Tac Toe")]
+[assembly: AssemblyDescription("The game Tic Tac Toe")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("Mijo Software")]
+[assembly: AssemblyProduct("Tic Tac Toe")]
+[assembly: AssemblyCopyright("2023 Mijo Software")]
+[assembly: AssemblyTrademark("Tic Tac Toe")]
+[assembly: AssemblyCulture("")]
+
+// Durch Festlegen von ComVisible auf FALSE werden die Typen in dieser Assembly
+// für COM-Komponenten unsichtbar.  Wenn Sie auf einen Typ in dieser Assembly von
+// COM aus zugreifen müssen, sollten Sie das ComVisible-Attribut für diesen Typ auf "True" festlegen.
+[assembly: ComVisible(false)]
+
+// Die folgende GUID bestimmt die ID der Typbibliothek, wenn dieses Projekt für COM verfügbar gemacht wird
+[assembly: Guid("ed14c7ef-5a78-4d5d-b564-f154fc864034")]
+
+// Versionsinformationen für eine Assembly bestehen aus den folgenden vier Werten:
+//
+//      Hauptversion
+//      Nebenversion
+//      Buildnummer
+//      Revision
+//
+// Sie können alle Werte angeben oder Standardwerte für die Build- und Revisionsnummern verwenden,
+// indem Sie "*" wie unten gezeigt eingeben:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("0.0.1.1")]
+[assembly: AssemblyFileVersion("0.0.1.1")]